Journal of energy storage最新文献_第4页

Synthesis of novel 2D g-C3N4/3D CoSe2 hierarchical microflower-like hybrids for high-performance energy-storage applications 合成用于高性能储能应用的新型二维 g-C3N4/3D CoSe2 分层微花状混合物

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-11-15 DOI: 10.1016/j.est.2024.114577

Rui Wang , Aijia Dai , Mule Vijayalakshmi , Won Young Jang , Raghava Reddy Kakarla , Jaesool Shim , Tejraj M. Aminabhavi , Ch. Venkata Reddy

The rapid development of new vehicles and portable electronics has continuously pressured advanced renewable energy-storage technologies to deliver exceptional energy-power outputs and long lifetimes. Hybrid supercapacitors attract attention owing to their outstanding power density, high specific capacitance, and excellent cycling stability. In this study, two-dimensional (2D) g-C₃N₄ nanosheets and 3D CoSe₂ hierarchical microflower heterojunction electrodes were synthesized using a facile hydrothermal preparation method, and their electrochemical performances were evaluated. Surface morphology analysis demonstrated that the g-C₃N₄ nanosheets were well-dispersed on the CoSe₂ hierarchical microflower surface. The interstitial contact between CoSe₂ and g-C₃N₄ effectively narrowed the bandgap energy, enhanced the electrical conductivity, and improved the electrochemical properties. Electrochemical analysis indicated rapid reaction kinetics and significant energy-storage capacity for the CoSe₂/g-C₃N₄ heterojunction electrode. Notably, the CoSe₂/g-C₃N₄ heterojunction electrode achieved a specific capacitance of 1024.4 F/g at 1 A/g. The assembled CoSe₂/g-C₃N₄ heterojunction hybrid supercapacitor device exhibited a high energy (62 Wh/kg), high power density (775 W/kg), and remarkable lifespan after 10,000 cycles. The developed electrode is promising for energy-related device applications.

新型汽车和便携式电子产品的快速发展不断迫使先进的可再生能源存储技术必须提供出色的能量输出和较长的使用寿命。混合超级电容器因其出色的功率密度、高比电容和卓越的循环稳定性而备受关注。本研究采用简便的水热制备方法合成了二维（2D）g-C3N4 纳米片和三维 CoSe2 分层微花异质结电极，并评估了它们的电化学性能。表面形貌分析表明，g-C3N4 纳米片很好地分散在 CoSe2 分层微花表面。CoSe2 与 g-C3N4 之间的间隙接触有效地缩小了带隙能，增强了导电性，改善了电化学性能。电化学分析表明，CoSe2/g-C3N4 异质结电极具有快速的反应动力学和显著的储能能力。值得注意的是，CoSe2/g-C3N4 异质结电极在 1 A/g 时的比电容达到了 1024.4 F/g。组装后的 CoSe2/g-C3N4 异质结混合超级电容器装置具有高能量（62 Wh/kg）、高功率密度（775 W/kg），并且在循环 10,000 次后仍具有出色的使用寿命。所开发的电极有望应用于能源相关设备。

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引用次数: 0

Synergistic enhancement of electrical and ionic conductivity in polyvinyl alcohol/polyvinylpyrrolidone‑copper/lithium titanate oxide electrolyte nanocomposite films for Li-ion battery applications 协同增强聚乙烯醇/聚乙烯吡咯烷酮-铜/钛酸锂氧化物电解质纳米复合薄膜的导电性和离子导电性，用于锂离子电池应用

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-11-15 DOI: 10.1016/j.est.2024.114534

Abdu Saeed , Amal Mohsen Alghamdi , Maha Aiiad Alenizi , Eman Alzahrani , Randa A. Althobiti , S.A. Al-Ghamdi , Reem Alwafi , G.M. Asnag , Ahmed N. Al-Hakimi , Aeshah Salem , E.M. Abdelrazek

Herein, we report the development of polymer nanocomposite electrolyte films tailored for advanced Li-ion battery applications. By incorporating copper/lithium titanate oxide nanoparticles (Cu/Li₄Ti₅O₁₂ NPs) into a polyvinyl alcohol/polyvinylpyrrolidone (PVA/PVP) blend, we achieved significant enhancements in both ionic and electrical conductivity. The incorporation of Cu boosts the electrical pathways within the polymer matrix, thereby reducing internal resistance and enhancing the overall conductivity. Simultaneously, Li₄Ti₅O₁₂ acts as an additional source of Li ions, further elevating ionic transport within the electrolyte. Comprehensive analyses via dielectric and impedance spectroscopy confirmed the influence of Cu/Li₄Ti₅O₁₂ NPs on improving charge storage and transfer capabilities while minimizing electrode polarization across a wide frequency range. These enhancements are attributed to the homogenous distribution of NPs, as validated by scanning electron microscopy (SEM), and the adjusted crystalline characteristics confirmed via X-ray diffraction, leading to increased amorphous regions that support better ion mobility. Fourier-transform infrared spectroscopy (FTIR) also confirms NP-matrix interactions, altering polymer chain dynamics. Besides, thermogravimetric analysis (TGA) indicates increased thermal stability. The results indicate the promising capabilities of these nanocomposite films as efficient solid polymer electrolytes, capable of supporting faster charge-discharge cycles and ensuring enhanced performance and stability in Li-ion batteries.

在此，我们报告了专为先进锂离子电池应用开发的聚合物纳米复合电解质薄膜。通过在聚乙烯醇/聚乙烯吡咯烷酮（PVA/PVP）混合物中加入铜/钛酸锂氧化物纳米粒子（Cu/Li4Ti5O12 NPs），我们显著提高了离子导电性和电导率。铜的加入增强了聚合物基质内的电通路，从而降低了内阻，提高了整体导电性。同时，Li4Ti5O12 作为锂离子的额外来源，进一步提高了电解质内的离子传输。通过介电和阻抗光谱进行的综合分析证实了 Cu/Li4Ti5O12 NPs 对提高电荷存储和传输能力的影响，同时在很宽的频率范围内将电极极化降至最低。经扫描电子显微镜（SEM）验证，这些改进归功于 NPs 的均匀分布，以及经 X 射线衍射证实的调整后的结晶特性，从而增加了非晶区，支持更好的离子迁移率。傅立叶变换红外光谱（FTIR）也证实了 NP 与基质之间的相互作用，从而改变了聚合物链的动力学。此外，热重分析（TGA）表明热稳定性有所提高。研究结果表明，这些纳米复合薄膜有望成为高效的固体聚合物电解质，能够支持更快的充放电循环，并确保提高锂离子电池的性能和稳定性。

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引用次数: 0

Irida-graphene: A new two-dimensional electrode material for sodium-ion batteries 铱-石墨烯：钠离子电池的新型二维电极材料

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-11-15 DOI: 10.1016/j.est.2024.114456

Manpreet Kaur, Nidhi Duhan, T.J. Dhilip Kumar

The effectiveness of the irida-graphene monolayer for ion storage in sodium-ion batteries (SIBs) is evaluated using density functional theory. The nanolayer possesses a stable structure both dynamically and thermally, along with dependable mechanical properties. The density of states and band structure computations confirmed the excellent conductivity of the monolayer. The storage capacity and energy density have been assessed at 1116.7 mAhg⁻¹, and 2854.9 mWhg⁻¹ respectively, for Na-ion batteries. Additionally, the small energy barrier of 0.079 eV and heightened diffusion rate of 2.83 x 10⁻⁴ cm²s⁻¹ for Na ions indicate their easy migration across the surface of the nanolayer during the complete cycle. Furthermore, the open circuit voltage obtained 0.15 V for SIBs, is consistent with the commercial design requirements. Based on the theoretical investigation, irida-graphene clearly demonstrates excellent potential as a superior electrode for next-generation SIBs.

利用密度泛函理论评估了铱-石墨烯单层在钠离子电池（SIB）中存储离子的有效性。该纳米层具有稳定的动态和热结构，以及可靠的机械性能。态密度和带状结构计算证实了单层的优异导电性。经评估，瑙离子电池的存储容量和能量密度分别为 1116.7 mAhg-1 和 2854.9 mWhg-1。此外，Na 离子的能垒（0.079 eV）较小，扩散速率（2.83 x 10-4 cm2s-1）较高，这表明它们在整个循环过程中很容易在纳米层表面迁移。此外，SIB 的开路电压为 0.15 V，符合商业设计要求。根据理论研究，铱石墨烯显然具有作为下一代 SIB 优异电极的巨大潜力。

引用次数: 0

Research on battery inconsistency evaluation based on improved local outlier factor and fuzzy matrix 基于改进的局部离群因子和模糊矩阵的电池不一致性评估研究

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-11-15 DOI: 10.1016/j.est.2024.114572

Jichao Hong , Kerui Li , Fengwei Liang , Haixu Yang , Yankai Hou , Fei Ma , Facheng Wang , Xinyang Zhang , Huaqin Zhang , Chi Zhang

Inconsistency between cells can seriously damage the overall performance of the battery pack and even cause safety accidents. An inconsistency evaluation model oriented to real-world vehicles is necessary owing to the contribution to battery management and maintenance. This paper proposes a comprehensive inconsistency evaluation strategy based on improved local outlier factor (ImLOF) algorithm and fuzzy matrix. Battery cell voltage is used as the basis for evaluation, and the abnormal rate distribution of each cell is analyzed by the established cell anomaly detection model. Each cell is set as an evaluation indicator to assess the state of inconsistency of the whole battery pack based on a fuzzy matrix and evaluation factor. The evaluation strategy is validated by full life cycle data from a real-world vehicle, and the results show that the proposed method can be effectively applied to evaluate the inconsistency of battery packs in real vehicles.

电池之间的不一致性会严重损害电池组的整体性能，甚至引发安全事故。考虑到不一致性对电池管理和维护的贡献，有必要建立一个面向实际车辆的不一致性评估模型。本文提出了一种基于改进的局部离群因子（ImLOF）算法和模糊矩阵的综合不一致性评估策略。以电池单体电压为评估基础，通过建立的电池单体异常检测模型分析每个电池单体的异常率分布。基于模糊矩阵和评价因子，将每个电池单元设置为评价指标，以评估整个电池组的不一致性状态。评估策略通过实际车辆的全生命周期数据进行了验证，结果表明所提出的方法可以有效地应用于评估实际车辆中电池组的不一致性。

引用次数: 0

Influence of confinement on the thermophysical property of paraffin wax/Kevlar nanofibrous phase change film 约束对石蜡/凯芙拉纳米纤维相变薄膜热物理性质的影响

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-11-15 DOI: 10.1016/j.est.2024.114553

Yi Wang , Xiaofeng Yuan , Jianjun Wang , Jianrong Wang , Ting Zhang , Yi Zheng , Yangtao Xu

The introduction of porous matrix in shape stable phase change materials (PCMs) alters the phase transition behavior of confined molecules. The mechanism by which the matrix affects the thermophysical properties of composite PCMs is still unclear, even there are conflicting understandings of the same phenomenon. According to this, paraffin/Kevlar nanofibrous films (PF/KNF) with different PF contents were fabricated by one step self-assembly method to comprehensively evaluate the regulation of confinement effects on the thermophysical properties and crystallization kinetics of confined PCMs. Due to the strong self-assembly tendency of Kevlar nanofibers in proton environment, paraffin passively wrapped in the network of matrix, forming a sandwich layered structure. The confinement of matrix altered the crystal structure of paraffin, even leading to the amorphous states in films with lower paraffin content. It also leaded to the formation of a non-melting layer at host-guest interface, thereby reducing the latent heat of composite PCMs. The latent heat of PF/KNF-70, the film with the highest paraffin content without leakage, decreased by about 32.7 % compared to the theoretical enthalpy calculated based on the mass percentage of paraffin in composite. In addition, the percentage of non-phase transition layer decreased linearly with the increase of PF content. The results of crystalline dynamics indicate that the matrix plays a dual role in providing nucleation sites and inhibiting molecular motion. When crystallization occurs at higher temperature (48.8 °C in this study), providing nucleation sites and promoting crystallization dominated the process, while inhibiting molecular motion and reducing crystallization rate become more prominent when crystallization temperature decreases.

在形状稳定的相变材料（PCM）中引入多孔基质会改变封闭分子的相变行为。基质影响复合 PCM 热物理性质的机制尚不清楚，甚至对同一现象的理解也存在冲突。有鉴于此，本研究采用一步自组装法制备了不同 PF 含量的石蜡/凯夫拉纳米纤维膜（PF/KNF），以全面评价约束效应对约束 PCM 热物理性质和结晶动力学的调控作用。由于 Kevlar 纳米纤维在质子环境中具有很强的自组装倾向，石蜡被动地包裹在基体网络中，形成了夹层结构。基质的约束改变了石蜡的晶体结构，甚至导致石蜡含量较低的薄膜出现非晶态。它还导致在主客界面形成非熔化层，从而降低了复合 PCM 的潜热。与根据复合材料中石蜡的质量百分比计算出的理论焓值相比，石蜡含量最高且无泄漏的薄膜 PF/KNF-70 的潜热降低了约 32.7%。此外，非相变层的百分比随着石蜡含量的增加呈线性下降。结晶动力学结果表明，基体在提供成核场所和抑制分子运动方面起着双重作用。当结晶发生在较高温度（本研究中为 48.8 °C）时，提供成核位点和促进结晶的作用占主导地位，而当结晶温度降低时，抑制分子运动和降低结晶速率的作用更加突出。

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引用次数: 0

Laboratory study on acoustic emission signals and damage mechanism of rock with thermal storage potential under fatigue loading 疲劳载荷下具有蓄热潜能的岩石的声发射信号和破坏机理的实验室研究

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-11-15 DOI: 10.1016/j.est.2024.114414

Zhanming Shi , Jiangteng Li , P.G. Ranjith , Hang Lin , Taoying Liu , Kaihui Li , Dongya Han

This study selected granite with thermal storage potential for heat treatment and fatigue loading tests. First, the differences in fatigue mechanical properties of the samples were compared. Then, based on the b-value theory and AF-RA classification model, the kernel density estimation and gradient descent algorithm were used to analyze the growth scale and the proportion change of tensile-shear cracks. Based on the critical slowing-down theory, an early warning index of fatigue failure was proposed. Finally, the thermal damage mechanism was discussed on multiple scales by using a polarizing microscope, scanning electron microscopy and thermogravimetric analysis technology, and a fatigue damage model was established. Our laboratory work shows that temperature has a staged influence mechanism on granite samples under fatigue loading. As the temperature increases, the strength, modulus, and fatigue life of heat-treated samples will show a staged evolution law of strengthening-weakening-accelerated weakening. The proportion of shear cracks inside the sample decreases first and then increases, and the development time of fatigue failure shortens first and then prolongs. The staged thermal decomposition process and microstructural changes of minerals such as quartz, feldspar, and mica are the main reasons for the staged influence mechanism of temperature. In addition, the fatigue damage curve of the heat-treated granite sample is an inverted S-shaped, which can be divided into three stages: initial damage -stable damage -accelerated damage. The hysteresis curves formed by the samples with a larger proportion of shear cracks are sparser. The appearance of a large number of shear cracks can be used as a precursor indicator of rock fatigue failure. The early warning index proposed in this paper provides new ideas for understanding and predicting the disaster behavior of thermal storage rock mass engineering under fatigue disturbance.

本研究选择了具有蓄热潜力的花岗岩进行热处理和疲劳加载试验。首先，比较了样品疲劳力学性能的差异。然后，基于 b 值理论和 AF-RA 分类模型，利用核密度估计和梯度下降算法分析了拉剪裂纹的生长规模和比例变化。基于临界减速理论，提出了疲劳失效的预警指标。最后，利用偏光显微镜、扫描电子显微镜和热重分析技术对热损伤机理进行了多尺度探讨，并建立了疲劳损伤模型。我们的实验室工作表明，温度对疲劳加载下的花岗岩样品具有分阶段的影响机制。随着温度的升高，热处理样品的强度、模量和疲劳寿命将呈现出强化-削弱-加速削弱的阶段性演变规律。试样内部剪切裂纹的比例先减小后增大，疲劳破坏的发展时间先缩短后延长。石英、长石和云母等矿物的阶段性热分解过程和微观结构变化是温度阶段性影响机制的主要原因。此外，热处理花岗岩样品的疲劳损伤曲线呈倒 "S "形，可分为三个阶段：初始损伤-稳定损伤-加速损伤。剪切裂纹比例较大的试样形成的滞后曲线较为稀疏。大量剪切裂缝的出现可作为岩石疲劳破坏的前兆指标。本文提出的预警指标为理解和预测疲劳扰动下蓄热岩体工程的灾害行为提供了新思路。

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引用次数: 0

Exploration of chloride ion impurities on solid-liquid-vapor phase diagram and thermal performance of nitrate molten salts 氯离子杂质对硝酸盐熔盐固液相图和热性能的影响探讨

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-11-15 DOI: 10.1016/j.est.2024.114585

Zhun Yuan , Jing Ding , Weilong Wang , Shule Liu , Xiaolan Wei , Jianfeng Lu

Nitrate molten salts for heat storage play a crucial role in modern energy technologies such as concentrated solar power (CSP), but the influence of impurity chloride ions on nitrate molten salts requires further investigation. This article reports the solid-liquid-vapor phase diagram, thermophysical properties, and thermal stability of sodium/potassium nitrate system with impact of chloride ion impurity. Based on Common Ion Solvent (CIS) theory, a modified thermodynamic model and computational method for solid-liquid-vapor phase equilibrium in a binary system containing impurity ions are developed and validated. The results indicate that with the increase of chloride content, there is little change in the composition of the lowest melting and highest boiling points, but the temperature significantly decreases. Adding 3.0 mol% KCl reduced the lowest liquid phase temperature by 4.57 °C and the highest boiling temperature by 13.26 °C. Density increases with impurities, while specific heat and thermal conductivity decrease; correlations with temperature and ion concentration are established. Thermal conductivity drops by 5.59 % with 3.0 mol% KCl, because the short-range ordered vibrations of ions are disrupted by impurity ions. Experimental analysis of short-term and long-term thermal stability of systems containing impurity indicates that chloride ion impurity can increase the evaporation rate of salt due to higher vapor pressure but reduce thermal decomposition of nitrate.

用于储热的硝酸盐熔盐在聚光太阳能发电（CSP）等现代能源技术中发挥着重要作用，但杂质氯离子对硝酸盐熔盐的影响需要进一步研究。本文报告了受氯离子杂质影响的硝酸钠/钾体系的固液气相图、热物理性质和热稳定性。基于共离子溶剂（CIS）理论，建立并验证了含杂质离子的二元体系固-液-气相平衡的修正热力学模型和计算方法。结果表明，随着氯化物含量的增加，最低熔点和最高沸点的组成变化不大，但温度明显降低。添加 3.0 mol% KCl 可使最低液相温度降低 4.57 ℃，最高沸点温度降低 13.26 ℃。密度随杂质的增加而增加，而比热和热导率则降低；与温度和离子浓度建立了相关关系。由于杂质离子破坏了离子的短程有序振动，3.0 摩尔% KCl 的热导率下降了 5.59%。对含有杂质的体系的短期和长期热稳定性的实验分析表明，氯离子杂质会因蒸气压升高而增加盐的蒸发率，但会减少硝酸盐的热分解。

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引用次数: 0

Synergistic effects of scandium doping and N-rGO integration on titanium oxide and evaluating faradic/non faradic behavior by Dunn's model for high-performance supercapattery applications 氧化钛上掺杂钪和集成 N-rGO 的协同效应，以及通过邓恩模型评估高性能超级电池应用中的法拉第/非法拉第行为

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-11-15 DOI: 10.1016/j.est.2024.114576

Karma M. Albalawi , Mawaheb Al-Dossari , Ahmad M. Saeedi , Raed H. Althomali , Gideon F.B. Solre , Maria Sadiq , Sana Ullah Asif

Supercapacitors have wide-ranging utility in many commercial energy applications. However, despite the remarkable features, researchers are still facing serious challenges regarding the charge-storing potential of these devices. In the current research work, we mainly paid attention to the materials having high porosity and larger surface area, as these features make them electrochemically ideal supercapacitor materials with greater energy-storage potential. For this purpose, titanium oxide (TiO₂), scandium-doped TiO₂ (ScTi), and N-rGO-doped ScTi (ScTi/N-rGO) nanostructures are efficiently synthesized through simple sol-gel and hydrothermal method. Electrochemical results show that ultra-capacitors based on ScTi/N-rGO electrodes have the highest specific capacitance (Csp) ScTi/N-rGO with 1595.37 Fg⁻¹ at 1 A/g. Dunn's model is used to assess the relative contributions of faradic and non-faradic processes in electrochemical reactions and their results showed that the prior operating system is larger than the later one that delineated the battery-grade nature of doped ScTi/N-rGO. Additionally, two electrode symmetric analyses depicted Csp 998.56 F g⁻¹ at 1 Ag⁻¹ and retained 88.92 % capacity after 6000 cycles. Thus, the results of this work also unveil that the electrochemical performance of the optimized ScTi/N-rGO nanocomposites is linked with the two prime factors entailing the optimization of N-rGO and scandium doping. Furthermore, it upsurges the TiO₂ conductivity as well as enhances the structural porosity which in turn increases the specific surface area. Thus, it is concluded that findings could be potential enough to indicate the vast array of possible electrochemical usage of synthesized porous ScTi/ N-rGO nanostructures.

超级电容器在许多商业能源应用中有着广泛的用途。然而，尽管超级电容器具有显著的特点，但研究人员在这些器件的电荷存储潜力方面仍面临严峻挑战。在目前的研究工作中，我们主要关注具有高孔隙率和较大比表面积的材料，因为这些特征使它们成为电化学上理想的超级电容器材料，具有更大的储能潜力。为此，我们通过简单的溶胶-凝胶法和水热法高效合成了氧化钛（TiO2）、掺杂钪的 TiO2（ScTi）和掺杂 N-rGO 的 ScTi（ScTi/N-rGO）纳米结构。电化学结果表明，基于 ScTi/N-rGO 电极的超级电容器具有最高的比电容（Csp），ScTi/N-rGO 在 1 A/g 时的比电容为 1595.37 Fg-1。邓恩模型用于评估电化学反应中法拉第和非法拉第过程的相对贡献，其结果表明，先前的操作系统大于后来的操作系统，后者划定了掺杂 ScTi/N-rGO 的电池级性质。此外，两个电极的对称分析表明，在 1 Ag-1 条件下，Csp 为 998.56 F g-1，循环 6000 次后，容量保持在 88.92%。因此，这项工作的结果也揭示了优化的 ScTi/N-rGO 纳米复合材料的电化学性能与 N-rGO 的优化和掺钪这两个主要因素有关。此外，它还提高了二氧化钛的导电性，增强了结构孔隙率，进而增加了比表面积。因此，研究结果足以说明合成的多孔 ScTi/ N-rGO 纳米结构具有广泛的电化学用途。

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引用次数: 0

Multivariate analysis of heat transfer enhancement of large capacity prismatic battery thermal management system based on reflux box 基于回流箱的大容量棱柱电池热管理系统传热增强多变量分析

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-11-15 DOI: 10.1016/j.est.2024.114537

Zeyuan Peng , Zeyu Liu , Aiguo Han , Philip K. Agyeman

In order to ensure the normal operation of power batteries in very high temperature environment (T₀ = 35 °C), a new battery thermal management system (BTMS) is developed in this paper. An innovative combination of non-isometric flow channels and a bottom return box is used to simultaneously enhance the heat transfer in the dense heat-producing zone at the top of the cell and to strengthen the temperature uniformity of the BTMS. Comparative studies of coolant input, isometric and non-isometric flow channels were designed, and orthogonal experimental designs for multi-objective optimization of the BTMS were conducted with maximum temperature (T_max), mean temperature (T_ave), maximum temperature difference (ΔT_max), flow loss (ΔP) and entropy generation (s_g) as the objective functions, respectively. The results show that the BTMS with return flow has an enhanced cooling performance and temperature uniformity compared with the pure liquid cooling system. The T_max and T_ave of the BTMS at the optimal working point are 30.28 °C and 29.17 °C, respectively. Compared with the pure liquid cooling BTMS at the same flow rate, they are reduced by 1.72 °C and 1.69 °C, respectively, and the ΔT_max is reduced by 20.8 %. Compared with the BTMS with the strongest cooling performance operating point, the ΔT_max of the BTMS at the optimal operating point increased by about 0.24 °C, but the ΔP decreased from 62.86 Pa to 36.22 Pa, decreasing by 42.38 %.

为了确保动力电池在超高温环境（T0 = 35 °C）下正常工作，本文开发了一种新型电池热管理系统（BTMS）。非等距流道和底部回流箱的创新组合，可同时增强电池顶部高密度产热区的传热，并加强 BTMS 的温度均匀性。对冷却剂输入、等距流道和非等距流道进行了比较研究，并分别以最高温度（Tmax）、平均温度（Tave）、最大温差（ΔTmax）、流动损失（ΔP）和熵产生（sg）为目标函数，对 BTMS 进行了多目标优化的正交实验设计。结果表明，与纯液体冷却系统相比，带回流的 BTMS 具有更高的冷却性能和温度均匀性。在最佳工作点，BTMS 的 Tmax 和 Tave 分别为 30.28 ℃ 和 29.17 ℃。与相同流量下的纯液体冷却 BTMS 相比，它们分别降低了 1.72 ℃ 和 1.69 ℃，ΔTmax 降低了 20.8%。与具有最强冷却性能工作点的 BTMS 相比，最佳工作点 BTMS 的 ΔTmax 升高了约 0.24 °C，但 ΔP 却从 62.86 Pa 降至 36.22 Pa，降低了 42.38 %。

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引用次数: 0

Improving energy storage properties in (Ba0.75Sr0.1Bi0.1)(Ti0.9Zr0.1)O3 ceramic thick films by adding (Sb0.5Li0.5)TiO3, domain engineering and defect engineering 通过添加(Sb0.5Li0.5)TiO3、畴工程和缺陷工程改善(Ba0.75Sr0.1Bi0.1)(Ti0.9Zr0.1)O3 陶瓷厚膜的储能性能

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-11-15 DOI: 10.1016/j.est.2024.114549

Juanwen Yan , Guiwei Yan , Jun Sun , Bijun Fang , Shuai Zhang , Xiaolong Lu , Jianning Ding

(1-x)(Ba_0.75Sr_0.1Bi_0.1)(Ti_0.9Zr_0.1)O₃-x(Sb_0.5Li_0.5)TiO₃ (BSBiTZ-xSLT, x = 0.025, 0.05, 0.075, 0.1) ceramic thick films were prepared via film scaping process. The decrease of tetragonal, rhombohedral and orthogonal phases and the appearance of cubic phase in the BSBiTZ-xSLT ceramic thick films strengthen the ferroelectricity and weaken the relaxation characteristic with the increase of SLT doping amount. For the BSBiTZ-0.025SLT ceramic thick film, fine grain size of 0.86 μm, excellent uniformity of grain distribution, low porosity, larger bandgap of 2.44 eV and grain boundary resistance of 153 kΩ reinforce the breakdown field up to 350 kV/cm. Doping SLT, domain engineering and defect engineering successfully reduce the remnant polarization and improve the relaxation ferroelectric characteristic with the obvious frequency dispersion, wide peak of the dielectric constant extending to ∼120 °C with fluctuation <10 %, and low dielectric loss of <0.1. In the BSBiTZ-0.025SLT ceramic thick film, the highest recoverable energy storage density (W_rec = 1.92 J/cm³), larger energy storage efficiency (η = 88.32 %), pulse energy storage performance (W_d = 1.48 J/cm³), current density (C_D = 743.09 A/cm²) and power density (P_D = 130.04 MW/cm³) are achieved under 350 kV/cm. The excellent energy storage performance combined with the excellent temperature stability and fatigue resistance provide the good development prospect as a lead-free BT-based ceramic dielectric capacitor in high-power pulse energy storage system.

(1-x)(Ba0.75Sr0.1Bi0.1)(Ti0.9Zr0.1)O3-x(Sb0.5Li0.5)TiO3 (BSBiTZ-xSLT, x = 0.025, 0.05, 0.075, 0.1) 陶瓷厚膜。随着 SLT 掺杂量的增加，BSBiTZ-xSLT 陶瓷厚膜中的四方相、斜方相和正交相减少，立方相出现，从而增强了铁电性，减弱了弛豫特性。对于 BSBiTZ-0.025SLT 陶瓷厚膜，0.86 μm 的细晶粒尺寸、优异的晶粒分布均匀性、低孔隙率、2.44 eV 的较大带隙和 153 kΩ 的晶界电阻增强了高达 350 kV/cm 的击穿场强。掺杂 SLT、畴工程和缺陷工程成功地降低了残余极化，改善了弛豫铁电特性，具有明显的频率分散性，介电常数峰值宽，可延伸至 120 ∼ 120 °C，波动率为 10%，介电损耗低至 0.1。在 350 kV/cm 下，BSBiTZ-0.025SLT 陶瓷厚膜实现了最高的可恢复储能密度（Wrec = 1.92 J/cm3）、更高的储能效率（η = 88.32 %）、脉冲储能性能（Wd = 1.48 J/cm3）、电流密度（CD = 743.09 A/cm2 ）和功率密度（PD = 130.04 MW/cm3）。优异的储能性能与出色的温度稳定性和抗疲劳性相结合，为无铅 BT 基陶瓷介质电容器在大功率脉冲储能系统中的应用提供了良好的发展前景。

{"title":"Improving energy storage properties in (Ba0.75Sr0.1Bi0.1)(Ti0.9Zr0.1)O3 ceramic thick films by adding (Sb0.5Li0.5)TiO3, domain engineering and defect engineering","authors":"Juanwen Yan , Guiwei Yan , Jun Sun , Bijun Fang , Shuai Zhang , Xiaolong Lu , Jianning Ding","doi":"10.1016/j.est.2024.114549","DOIUrl":"10.1016/j.est.2024.114549","url":null,"abstract":"<div><div>(1-x)(Ba0.75Sr0.1Bi0.1)(Ti0.9Zr0.1)O3-x(Sb0.5Li0.5)TiO3 (BSBiTZ-xSLT, x = 0.025, 0.05, 0.075, 0.1) ceramic thick films were prepared via film scaping process. The decrease of tetragonal, rhombohedral and orthogonal phases and the appearance of cubic phase in the BSBiTZ-xSLT ceramic thick films strengthen the ferroelectricity and weaken the relaxation characteristic with the increase of SLT doping amount. For the BSBiTZ-0.025SLT ceramic thick film, fine grain size of 0.86 μm, excellent uniformity of grain distribution, low porosity, larger bandgap of 2.44 eV and grain boundary resistance of 153 kΩ reinforce the breakdown field up to 350 kV/cm. Doping SLT, domain engineering and defect engineering successfully reduce the remnant polarization and improve the relaxation ferroelectric characteristic with the obvious frequency dispersion, wide peak of the dielectric constant extending to ∼120 °C with fluctuation <10 %, and low dielectric loss of <0.1. In the BSBiTZ-0.025SLT ceramic thick film, the highest recoverable energy storage density (Wrec = 1.92 J/cm3), larger energy storage efficiency (η = 88.32 %), pulse energy storage performance (Wd = 1.48 J/cm3), current density (CD = 743.09 A/cm2) and power density (PD = 130.04 MW/cm3) are achieved under 350 kV/cm. The excellent energy storage performance combined with the excellent temperature stability and fatigue resistance provide the good development prospect as a lead-free BT-based ceramic dielectric capacitor in high-power pulse energy storage system.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"104 ","pages":"Article 114549"},"PeriodicalIF":8.9,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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