Pub Date : 2023-06-30DOI: 10.31613/ceramist.2023.26.2.04
Jae-Sun Cho
This review article highlights the potential of flash sintering as a novel densification technology for advanced ceramics. Conventional ceramic sintering methods involve heating a powder compact at high temperatures for several hours to trigger the solid-state diffusion of atoms. In contrast, flash sintering takes advantage of electric field and current to drastically lower processing time and temperature, providing a promising solution to reduce the economic, energetic, and environmental costs associated with traditional ceramic sintering methods. The effects of electric field and current during flash sintering result in unique non-equilibrium microstructures that enhance the mechanical properties of advanced ceramics through defect-mediated inelastic deformation mechanisms. This article provides an overview of the flash sintering mechanisms, the unique microstructural features observed in flash-sintered ceramics, and their impacts on mechanical properties.
{"title":"Short Review of Flash Sintering: Mechanisms, Microstructures, and Mechanical Properties","authors":"Jae-Sun Cho","doi":"10.31613/ceramist.2023.26.2.04","DOIUrl":"https://doi.org/10.31613/ceramist.2023.26.2.04","url":null,"abstract":"This review article highlights the potential of flash sintering as a novel densification technology for advanced ceramics. Conventional ceramic sintering methods involve heating a powder compact at high temperatures for several hours to trigger the solid-state diffusion of atoms. In contrast, flash sintering takes advantage of electric field and current to drastically lower processing time and temperature, providing a promising solution to reduce the economic, energetic, and environmental costs associated with traditional ceramic sintering methods. The effects of electric field and current during flash sintering result in unique non-equilibrium microstructures that enhance the mechanical properties of advanced ceramics through defect-mediated inelastic deformation mechanisms. This article provides an overview of the flash sintering mechanisms, the unique microstructural features observed in flash-sintered ceramics, and their impacts on mechanical properties.","PeriodicalId":9738,"journal":{"name":"Ceramist","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77963206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.31613/ceramist.2023.26.2.02
I. Seo, Ka-young Lee, Cheol-Min Oh, Hyoung-Won Kang
In line with the trend towards electrification in mobility, there is a demand for the development of next-generation Multilayer Ceramic Capacitors(MLCCs) with superior properties compared to those using the conventional BaTiO3 (BT) ceramics. For this, various high-performing ferroelectric ceramics have been proposed as post-BT materials, and numerous studies have been conducted on the role of oxygen vacancies within these materials. It has been confirmed that oxygen vacancies in the ceramic material have a significant impact on various properties such as oxygen ionic conduction, IR degradation, microstructure, aging degradation, and hardening effect, and by controlling the concentration and mobility of oxygen vacancies, it is possible to adjust these properties. We hope that research on the role of oxygen vacancies in various high-performing ferroelectric ceramics will be utilized as a foundation of knowledge for the development of next-generation MLCCs in the future.
{"title":"Research Trends on the Influence of Oxygen Vacancies in Post BaTiO3 (BT) Ceramics for Next-Generation MLCCs","authors":"I. Seo, Ka-young Lee, Cheol-Min Oh, Hyoung-Won Kang","doi":"10.31613/ceramist.2023.26.2.02","DOIUrl":"https://doi.org/10.31613/ceramist.2023.26.2.02","url":null,"abstract":"In line with the trend towards electrification in mobility, there is a demand for the development of next-generation Multilayer Ceramic Capacitors(MLCCs) with superior properties compared to those using the conventional BaTiO3 (BT) ceramics. For this, various high-performing ferroelectric ceramics have been proposed as post-BT materials, and numerous studies have been conducted on the role of oxygen vacancies within these materials. It has been confirmed that oxygen vacancies in the ceramic material have a significant impact on various properties such as oxygen ionic conduction, IR degradation, microstructure, aging degradation, and hardening effect, and by controlling the concentration and mobility of oxygen vacancies, it is possible to adjust these properties. We hope that research on the role of oxygen vacancies in various high-performing ferroelectric ceramics will be utilized as a foundation of knowledge for the development of next-generation MLCCs in the future.","PeriodicalId":9738,"journal":{"name":"Ceramist","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78325356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.31613/ceramist.2023.26.2.05
Haneul Kim, Young-Jo Park, J. Ko, Jae-Wook Lee, H. Ma
As the heat generation problem is predicted to intensify due to the trend of integration and high density of the power semiconductor power module responsible for the electric drive of the electric vehicle, which has recently been in full swing, high-reliability materials and It is essential to secure large-area heat dissipation substrate manufacturing process technology, and technical obstacles to maintain reliability even in environmental changes such as severe cold/excessive heat are becoming issues.In the case of silicon nitride ceramic material, which is in the spotlight as a heat dissipation substrate material, a balance that meets the user’s needs is required. In order to realize excellent heat dissipation performance, it is necessary to reduce the thickness of the silicon nitride substrate, increase the thickness of the metal junction, and improve the thermal conductivity of the silicon nitride material. Therefore, the task of technological progress beyond the complementary relationship between heat conduction-intensity still remains.In this paper, various technical considerations for increasing the thermal conductivity of silicon nitride ceramics are described, and the direction of technological progress is described along with detailed examples. In order to improve thermal conductivity, it is necessary to minimize the inflow of impurities into the raw material powder, appropriately select sintering additives required for liquid phase sintering, and optimize the microstructure through minimization of the amorphous glass phase and control of grain growth by the gas pressure sintering process.
{"title":"Review on the thermal characteristics and applications of silicon nitride ceramics","authors":"Haneul Kim, Young-Jo Park, J. Ko, Jae-Wook Lee, H. Ma","doi":"10.31613/ceramist.2023.26.2.05","DOIUrl":"https://doi.org/10.31613/ceramist.2023.26.2.05","url":null,"abstract":"As the heat generation problem is predicted to intensify due to the trend of integration and high density of the power semiconductor power module responsible for the electric drive of the electric vehicle, which has recently been in full swing, high-reliability materials and It is essential to secure large-area heat dissipation substrate manufacturing process technology, and technical obstacles to maintain reliability even in environmental changes such as severe cold/excessive heat are becoming issues.In the case of silicon nitride ceramic material, which is in the spotlight as a heat dissipation substrate material, a balance that meets the user’s needs is required. In order to realize excellent heat dissipation performance, it is necessary to reduce the thickness of the silicon nitride substrate, increase the thickness of the metal junction, and improve the thermal conductivity of the silicon nitride material. Therefore, the task of technological progress beyond the complementary relationship between heat conduction-intensity still remains.In this paper, various technical considerations for increasing the thermal conductivity of silicon nitride ceramics are described, and the direction of technological progress is described along with detailed examples. In order to improve thermal conductivity, it is necessary to minimize the inflow of impurities into the raw material powder, appropriately select sintering additives required for liquid phase sintering, and optimize the microstructure through minimization of the amorphous glass phase and control of grain growth by the gas pressure sintering process.","PeriodicalId":9738,"journal":{"name":"Ceramist","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88161904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.31613/ceramist.2023.26.2.03
Min-Seon Lee, Young Hun Heong
In this study, textured 0.38(Bi0.97Sm0.03)ScO3-0.62PbTiO3 (0.38BSS-0.62PT) ceramics with high Curie temperature were evaluated to assess temperature stable characteristics for high-temperature piezoelectric device applications. The 4 vol% BaTiO3 incorporated 0.38BSS-0.62PT ceramic was fabricated by conventional tape casting. Textured 0.38BSS-0.62PT ceramic was successfully produced at sintering temperature of 1150°C by textured grain growth (TGG). Textured 0.38BSS-0.62PT ceramic exhibited a high degree of crystal orientation of 94% in the [001]-direction. It also showed excellent dielectric and piezoelectric properties, (εT33/ε0 of 1746, d33 of 719 pC/N, kp of 61.8% and g33 of 45×10-3Vm/N, respectively). In addition, it also exhibited relaxor-like ferroelectric characteristics with a large relaxation coefficient (γ) of 1.77 along with high Curie temperature of approximately 373℃. Its temperature stability was satisfactory, resulting from in-situ d33 and kp, which were lower than 10% below Curie temperature. The electro-strain also showed thermally stable characteristics. Therefore, it is considered that the textured 0.38BSS-0.62PT ceramic has potential for high-temperature piezoelectric device applications.
{"title":"Temperature-stable Characteristics of Textured (Bi,Sm)ScO3-PbTiO3 Ceramics for High-temperature Piezoelectric Device Applications","authors":"Min-Seon Lee, Young Hun Heong","doi":"10.31613/ceramist.2023.26.2.03","DOIUrl":"https://doi.org/10.31613/ceramist.2023.26.2.03","url":null,"abstract":"In this study, textured 0.38(Bi<sub>0.97</sub>Sm<sub>0.03</sub>)ScO<sub>3</sub>-0.62PbTiO<sub>3</sub> (0.38BSS-0.62PT) ceramics with high Curie temperature were evaluated to assess temperature stable characteristics for high-temperature piezoelectric device applications. The 4 vol% BaTiO<sub>3</sub> incorporated 0.38BSS-0.62PT ceramic was fabricated by conventional tape casting. Textured 0.38BSS-0.62PT ceramic was successfully produced at sintering temperature of 1150°C by textured grain growth (TGG). Textured 0.38BSS-0.62PT ceramic exhibited a high degree of crystal orientation of 94% in the [001]-direction. It also showed excellent dielectric and piezoelectric properties, (<i>ε</i><sup>T</sup><sub>33</sub>/<i>ε</i><sub>0</sub> of 1746, <i>d</i><sub>33</sub> of 719 pC/N, <i>k</i><sub>p</sub> of 61.8% and <i>g</i><sub>33</sub> of 45×10<sup>-3</sup>Vm/N, respectively). In addition, it also exhibited relaxor-like ferroelectric characteristics with a large relaxation coefficient (γ) of 1.77 along with high Curie temperature of approximately 373℃. Its temperature stability was satisfactory, resulting from in-situ <i>d</i><sub>33</sub> and <i>k</i><sub>p</sub>, which were lower than 10% below Curie temperature. The electro-strain also showed thermally stable characteristics. Therefore, it is considered that the textured 0.38BSS-0.62PT ceramic has potential for high-temperature piezoelectric device applications.","PeriodicalId":9738,"journal":{"name":"Ceramist","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89970309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.31613/ceramist.2023.26.2.06
H. Lee, Yoonbo Sim, Kijae Kim
The increased use of lithium-ion batteries in larger devices such as electric vehicles and energy storage devices has led to a need for improved battery performance. Researchers are developing cathode active materials with higher energy density, such as lithium phosphate and lithium transition metal compounds. Ternary cathode active materials with high capacity have also been developed, but there are issues with cation mixing and side reactions that can lead to reduced capacity, voltage drop, and even explosions. To address these issues, researchers are focusing on stabilizing and optimizing the cathode-electrolyte interface through methods such as coating with protective layers, cation or anion doping and changing of active materials structure. Herein, we briefly introduce and discuss the recent research with development trend of cathode material’s degradation solution for Li-ion batteries.
{"title":"Resent Progress of LiNi1-x-yCoxMnyO2 for Lithium-ion batteries","authors":"H. Lee, Yoonbo Sim, Kijae Kim","doi":"10.31613/ceramist.2023.26.2.06","DOIUrl":"https://doi.org/10.31613/ceramist.2023.26.2.06","url":null,"abstract":"The increased use of lithium-ion batteries in larger devices such as electric vehicles and energy storage devices has led to a need for improved battery performance. Researchers are developing cathode active materials with higher energy density, such as lithium phosphate and lithium transition metal compounds. Ternary cathode active materials with high capacity have also been developed, but there are issues with cation mixing and side reactions that can lead to reduced capacity, voltage drop, and even explosions. To address these issues, researchers are focusing on stabilizing and optimizing the cathode-electrolyte interface through methods such as coating with protective layers, cation or anion doping and changing of active materials structure. Herein, we briefly introduce and discuss the recent research with development trend of cathode material’s degradation solution for Li-ion batteries.","PeriodicalId":9738,"journal":{"name":"Ceramist","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80284952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.31613/ceramist.2023.26.2.08
Joo Hyeong Suh, Dong Ki Kim, Min‐Sik Park
The demand for high-energy Li batteries is rapidly increasing due to the growing market for electric vehicles and portable electronic devices. Lithium (Li) metal has been considered as an ideal anode for high-energy Li batteries because of its high theoretical capacity (3860 mAh g-1) and low redox potential (-3.04 V vs. SHE). However, the utilization of Li metal anode is still limited by fundamental problems associated with unavoidable dendritic growth and huge volume changes during cycling. To improve the electrochemical performance of Li metal anode, various strategies have been explored including electrolyte design, interfacial engineering, and structural modifications. One of the most promising approaches is to store Li metal in porous host materials, which can effectively suppress the formation of Li dendrite and volume expansion. Herein, we focus on recent progress in the development of advanced Li metal anodes and suggest research directions and design rules.
由于电动汽车和便携式电子设备市场的增长，对高能锂电池的需求正在迅速增加。锂(Li)金属被认为是高能锂电池的理想阳极，因为它具有高理论容量(3860 mAh g-1)和低氧化还原电位(-3.04 V vs. SHE)。然而，锂金属阳极的利用仍然受到不可避免的枝晶生长和循环过程中巨大体积变化等基本问题的限制。为了提高锂金属阳极的电化学性能，人们探索了多种策略，包括电解质设计、界面工程和结构修饰。将锂金属储存在多孔载体材料中，可以有效抑制锂枝晶的形成和体积膨胀，是最有前途的方法之一。本文重点介绍了近年来先进锂金属阳极的研究进展，并提出了研究方向和设计原则。
{"title":"Perspectives on the development of advanced lithium metal anode","authors":"Joo Hyeong Suh, Dong Ki Kim, Min‐Sik Park","doi":"10.31613/ceramist.2023.26.2.08","DOIUrl":"https://doi.org/10.31613/ceramist.2023.26.2.08","url":null,"abstract":"The demand for high-energy Li batteries is rapidly increasing due to the growing market for electric vehicles and portable electronic devices. Lithium (Li) metal has been considered as an ideal anode for high-energy Li batteries because of its high theoretical capacity (3860 mAh g-1) and low redox potential (-3.04 V vs. SHE). However, the utilization of Li metal anode is still limited by fundamental problems associated with unavoidable dendritic growth and huge volume changes during cycling. To improve the electrochemical performance of Li metal anode, various strategies have been explored including electrolyte design, interfacial engineering, and structural modifications. One of the most promising approaches is to store Li metal in porous host materials, which can effectively suppress the formation of Li dendrite and volume expansion. Herein, we focus on recent progress in the development of advanced Li metal anodes and suggest research directions and design rules.","PeriodicalId":9738,"journal":{"name":"Ceramist","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75790623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.31613/ceramist.2023.26.2.01
Ku‐Tak Lee, Jinsung Chun, W. Jo
The demand for high performance multilayer ceramic capacitors (MLCCs) has rapidly increased keeping up with the recent trends in electronics seeking better performance per volume. It follows that thinning of dielectric layers of MLCC and atomization of powders have become two most challenging issues these days. However, it is well known that these two approaches are not free from reliability issues. In this brief review, we introduce the commonly accepted models that explain how dielectric materials fail during operation and how to evaluate the lifetime of MLCCs with a real world example.
{"title":"Reliability analysis of Multi-Layer Ceramic Capacitors based on BaTiO3 and their Mechanism of Insulation resistance degradation","authors":"Ku‐Tak Lee, Jinsung Chun, W. Jo","doi":"10.31613/ceramist.2023.26.2.01","DOIUrl":"https://doi.org/10.31613/ceramist.2023.26.2.01","url":null,"abstract":"The demand for high performance multilayer ceramic capacitors (MLCCs) has rapidly increased keeping up with the recent trends in electronics seeking better performance per volume. It follows that thinning of dielectric layers of MLCC and atomization of powders have become two most challenging issues these days. However, it is well known that these two approaches are not free from reliability issues. In this brief review, we introduce the commonly accepted models that explain how dielectric materials fail during operation and how to evaluate the lifetime of MLCCs with a real world example.","PeriodicalId":9738,"journal":{"name":"Ceramist","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88354138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.31613/ceramist.2023.26.2.07
Do-Hyeon Kim, Young-Han Lee, J. Yoon, Cheol-Min Park
Recently, there has been significant research activity in the field of energy storage systems with a focus on improving the energy density and safety of Li-ion batteries (LIBs). The liquid-state electrolytes used in LIBs have several safety issues, including flammability and decomposition due to exothermic reactions during repeated cycles. Addressing the flammability issue is particularly important for the widespread adoption of eco-friendly electric vehicles. As a result, all-solid-state batteries (ASSBs) that use stable and non-flammable solid-state electrolytes are being considered as an alternative solution. The use of solid-state electrolytes can also address concerns about thermal runaway, and research into adopting Li metal anodes is being conducted to achieve high-energy-density ASSBs. However, the problems of Li dendrite formation and solid electrolyte dissociation due to the reaction between Li and solid electrolyte still exist in ASSBs. To address these issues, many researchers are actively studying various types of anodes for ASSBs, including Li-metal, Li-interlayer, anode-free, carbon-based, oxide-based, and Li-alloy-based ASSB anodes. This study reviews recent progress and issues related to various types of ASSB anodes.
{"title":"Recent progress in all-solid-state Li-ion battery anodes","authors":"Do-Hyeon Kim, Young-Han Lee, J. Yoon, Cheol-Min Park","doi":"10.31613/ceramist.2023.26.2.07","DOIUrl":"https://doi.org/10.31613/ceramist.2023.26.2.07","url":null,"abstract":"Recently, there has been significant research activity in the field of energy storage systems with a focus on improving the energy density and safety of Li-ion batteries (LIBs). The liquid-state electrolytes used in LIBs have several safety issues, including flammability and decomposition due to exothermic reactions during repeated cycles. Addressing the flammability issue is particularly important for the widespread adoption of eco-friendly electric vehicles. As a result, all-solid-state batteries (ASSBs) that use stable and non-flammable solid-state electrolytes are being considered as an alternative solution. The use of solid-state electrolytes can also address concerns about thermal runaway, and research into adopting Li metal anodes is being conducted to achieve high-energy-density ASSBs. However, the problems of Li dendrite formation and solid electrolyte dissociation due to the reaction between Li and solid electrolyte still exist in ASSBs. To address these issues, many researchers are actively studying various types of anodes for ASSBs, including Li-metal, Li-interlayer, anode-free, carbon-based, oxide-based, and Li-alloy-based ASSB anodes. This study reviews recent progress and issues related to various types of ASSB anodes.","PeriodicalId":9738,"journal":{"name":"Ceramist","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82716560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-31DOI: 10.31613/ceramist.2023.26.1.10
Hyejeong Hyun, Jongwoo Lim
High-Ni layered oxide cathodes without Co are being investigated as potential cathode materials for Li-ion batteries with high energy density. By decreasing the Co content, these cathodes not only boost energy density but also alleviate concerns about the supply instability and fluctuating cost of Co raw materials. However, the elevated Ni content in the layered oxides causes distinct chemo-mechanical degradation mechanisms that inhibit their commercial application. In order to gain insight into the degradation process at various scales, from the atomic to the particle and the electrode levels, and to devise ways to prevent degradation, multi-scale characterization methods are essential. In this review, we critically evaluate the role of Co substitution in high-Ni layered oxides and the impact of Co content on the chemo-mechanical degradation process. Furthermore, the use of advanced X-ray-based characterization methods, which have helped shed light on the degradation mechanisms of high-Ni cathodes, is also discussed.
{"title":"Elucidating degradation mechanisms of Co-free high-Ni layered oxide cathodes for Li-ion batteries via advanced X-ray-based characterization methods","authors":"Hyejeong Hyun, Jongwoo Lim","doi":"10.31613/ceramist.2023.26.1.10","DOIUrl":"https://doi.org/10.31613/ceramist.2023.26.1.10","url":null,"abstract":"High-Ni layered oxide cathodes without Co are being investigated as potential cathode materials for Li-ion batteries with high energy density. By decreasing the Co content, these cathodes not only boost energy density but also alleviate concerns about the supply instability and fluctuating cost of Co raw materials. However, the elevated Ni content in the layered oxides causes distinct chemo-mechanical degradation mechanisms that inhibit their commercial application. In order to gain insight into the degradation process at various scales, from the atomic to the particle and the electrode levels, and to devise ways to prevent degradation, multi-scale characterization methods are essential. In this review, we critically evaluate the role of Co substitution in high-Ni layered oxides and the impact of Co content on the chemo-mechanical degradation process. Furthermore, the use of advanced X-ray-based characterization methods, which have helped shed light on the degradation mechanisms of high-Ni cathodes, is also discussed.","PeriodicalId":9738,"journal":{"name":"Ceramist","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90063423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-31DOI: 10.31613/ceramist.2023.26.1.08
M. Jang, Swati Singh, Joonki Suh
Understanding thermal energy transport of crystalline materials, often highly dependent on their crystalline directions, is crucial for energy harvesting and thermal management applications. In this sense, anisotropy in thermal conductivity (κ), which is the unique characteristic of two-dimensional (2D) materials involving graphene and transition metal dichalcogenides (TMDs), has been attracting tremendous attention in terms of fundamental science and application-driven technology aspects. This distinctive heat transport behavior of 2D van der Waals (vdW) materials generally originates from their intrinsic crystal structures and associated lattice vibrations. Here, we thoroughly review and summarize the anisotropic thermal conductivity in 2D vdW crystals in two different categories: 1) in-plane vs. out-of-plane and 2) between two different in-plane directions. In addition, we introduce a range of thermal conductivity measurement techniques that can be employed for 2D vdW materials provided with their working principles, advantages, and limitations. Beyond their intrinsic anisotropic ratio, we conclude with perspectives on the extrinsic modulations of thermal conductivities, thereby maximizing it toward effective thermal management.
{"title":"Anisotropic thermal conductivity in two-dimensional van der Waals crystals","authors":"M. Jang, Swati Singh, Joonki Suh","doi":"10.31613/ceramist.2023.26.1.08","DOIUrl":"https://doi.org/10.31613/ceramist.2023.26.1.08","url":null,"abstract":"Understanding thermal energy transport of crystalline materials, often highly dependent on their crystalline directions, is crucial for energy harvesting and thermal management applications. In this sense, anisotropy in thermal conductivity (κ), which is the unique characteristic of two-dimensional (2D) materials involving graphene and transition metal dichalcogenides (TMDs), has been attracting tremendous attention in terms of fundamental science and application-driven technology aspects. This distinctive heat transport behavior of 2D van der Waals (vdW) materials generally originates from their intrinsic crystal structures and associated lattice vibrations. Here, we thoroughly review and summarize the anisotropic thermal conductivity in 2D vdW crystals in two different categories: 1) in-plane vs. out-of-plane and 2) between two different in-plane directions. In addition, we introduce a range of thermal conductivity measurement techniques that can be employed for 2D vdW materials provided with their working principles, advantages, and limitations. Beyond their intrinsic anisotropic ratio, we conclude with perspectives on the extrinsic modulations of thermal conductivities, thereby maximizing it toward effective thermal management.","PeriodicalId":9738,"journal":{"name":"Ceramist","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80773768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：