Journal of energy storage最新文献

Improvement of the thermal management of lithium-ion battery with helical tube liquid cooling and phase change material integration 利用螺旋管液体冷却和相变材料集成改进锂离子电池的热管理

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-10-16 DOI: 10.1016/j.est.2024.114113

This study investigates innovative thermal management strategies for lithium-ion batteries, including uncooled batteries, batteries cooled by phase change material (PCM) only, batteries cooled by flow through a helical tube only, and batteries cooled by a combination of liquid cooling through a helical tube and PCM in direct contact with the battery surface. Transient computational fluid dynamics (CFD) modeling is utilized to analyze the effectiveness of these cooling methods. The liquid cooling is directed through a helical tube wrapped around the battery, facilitating efficient temperature regulation. Additionally, PCM is incorporated to surround both the battery and the helical tube, thereby enhancing the heat dissipation capabilities. The performance of the combined cooling system is assessed under various conditions, including the individual contributions of liquid cooling and PCM cooling, as well as their combined effects. The findings show that the proposed approach performs better than individual cooling methods and it effectively lowers the battery's maximum temperature. Besides, as the pitch of the helical tube decreases, there is a significant decrease in the surface temperature of the battery. This decrease in temperature enhances the efficiency of liquid cooling, allowing for more effective heat dissipation from the battery surface. It is also found that increasing the flow velocity inside the helical tube leads to improved convective heat transfer. Overall, the combined cooling approach described here shows great promise as an effective solution for thermal management of lithium-ion batteries.

本研究调查了锂离子电池的创新热管理策略，包括非冷却电池、仅通过相变材料 (PCM) 冷却的电池、仅通过流经螺旋管冷却的电池，以及通过螺旋管和直接接触电池表面的 PCM 的液体冷却组合冷却的电池。瞬态计算流体动力学 (CFD) 模型用于分析这些冷却方法的有效性。液体冷却通过缠绕在电池周围的螺旋管进行，从而提高了温度调节的效率。此外，在电池和螺旋管周围还加入了 PCM，从而增强了散热能力。在各种条件下对组合冷却系统的性能进行了评估，包括液体冷却和 PCM 冷却的单独贡献以及它们的组合效应。研究结果表明，所提出的方法比单独的冷却方法性能更好，能有效降低电池的最高温度。此外，随着螺旋管间距的减小，电池表面温度也会显著降低。温度的降低提高了液体冷却的效率，使电池表面的散热更加有效。研究还发现，提高螺旋管内的流速可改善对流传热。总之，本文所述的组合冷却方法有望成为锂离子电池热管理的有效解决方案。

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引用次数: 0

Valence-controlled manganese oxide by solvent-assisted permanganate reduction for advanced aqueous zinc-ion batteries 通过溶剂辅助高锰酸盐还原实现价控氧化锰，用于先进的锌离子水电池

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-10-16 DOI: 10.1016/j.est.2024.114041

Manganese oxide-based cathodes (MnO_x) play a pivotal role in advancing aqueous Zinc-Ion batteries (AZIB) due to their high theoretical capacity, low cost and environmental friendliness. However, given the MnO_x's diverse structural, valence and textural properties, it is challenging to pinpoint the ideal manganese oxide material type and optimize simple and tunable synthesis routes to achieve great capacity retention and rate capability properties. In this work, we develop for the first time a synthesis method controlling the crystallization pathways and valence properties of MnO_x materials through permanganate reduction using different reducing agents (Ethanol and Propanal) followed by heat treatment under 500 °C, thus achieving the synthesis of multivalent E500-MnO_x (MnO₂) and Trivalent P500-MnO_x (Mn₂O₃). As cathode materials in AZIB, P500-MnO_x reached a specific capacity of 315 mAh·g⁻¹ without any apparent capacity decay, while E500-MnO_x showed a lower specific capacity of 150 mAh·g⁻¹ at 100 mA·g⁻¹ with a capacity retention of only 65 %. Through Ex-Situ XRD and SEM imaging, P500-MnO_x exhibited a reversible cycling mechanism compared to its E500-MnO_x counterpart which had preoccupied insertion sites.

基于氧化锰的阴极（MnOx）具有理论容量高、成本低和环境友好等优点，在推动锌离子水电池（AZIB）的发展中发挥着举足轻重的作用。然而，由于氧化锰的结构、化合价和质地特性各不相同，要确定理想的氧化锰材料类型并优化简单、可调的合成路线，以实现出色的容量保持和速率能力特性，是一项挑战。在这项工作中，我们首次开发了一种合成方法，通过使用不同的还原剂（乙醇和丙醛）进行高锰酸盐还原，然后在 500 °C 下进行热处理，控制氧化锰材料的结晶途径和价态特性，从而实现多价 E500-MnOx （MnO2）和三价 P500-MnOx （Mn2O3）的合成。作为 AZIB 的阴极材料，P500-MnOx 的比容量达到 315 mAh-g-1，且无明显容量衰减；而 E500-MnOx 的比容量较低，在 100 mA-g-1 时为 150 mAh-g-1，容量保持率仅为 65%。通过原位 XRD 和 SEM 成像，与 E500-MnOx 相比，P500-MnOx 表现出一种可逆循环机制，因为 E500-MnOx 的插入位点被预先占据。

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引用次数: 0

Fast kinetics for lithium storage rendered by Li3VO4 nanoparticles/porous N-doped carbon nanofibers 纳米氧化锂（Li3VO4）颗粒/多孔掺杂 N 的纳米碳纤维的快速锂存储动力学

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-10-16 DOI: 10.1016/j.est.2024.114193

Li₃VO₄ (LVO) has been recognized as an alternative anode material for lithium-ion batteries (LIBs) because of its appropriate lithium storage potential and capacity merits. However, its practical application is seriously hindered by slow reaction kinetics stemming from poor electronic conductivity. Herein, Li₃VO₄/porous N-doped carbon nanofibers (LVO/PNC NFs) are firstly designed and fabricated via an electrospinning method, utilizing the thermal decomposition characteristics of polylactic acid (PLA). The porous N-doped carbon nanofibers provide efficient electrolyte diffusion paths and facilitate ion transport. In addition, LVO nanoparticles are uniformly dispersed along the nanofibers to effectively inhibit particle aggregation. The obtained LVO/PNC NFs are evaluated as anodes for LIBs and deliver high reversible capacity of 768 mAh g⁻¹ after 300 cycles at 0.2 A g⁻¹, along with excellent rate capability (average capacity of 355 mAh g⁻¹ at 8 A g⁻¹ after 6 periodic rate testing) and long cycling life (286 mAh g⁻¹ after 2000 cycles at 4 A g⁻¹). The special porous nanofiber represents an effective strategy for improving the electronic conductivity, inhibiting particle aggregation, and ensuring rapid ion/charge transport towards advanced energy storage technologies.

Li3VO4（LVO）具有适当的锂储存潜力和容量优势，已被公认为锂离子电池（LIB）的替代负极材料。然而，由于电子传导性差，反应动力学缓慢，严重阻碍了其实际应用。本文首先利用聚乳酸（PLA）的热分解特性，通过电纺丝方法设计并制备了 Li3VO4/多孔 N 掺杂碳纳米纤维（LVO/PNC NFs）。多孔的 N 掺杂碳纳米纤维提供了有效的电解质扩散路径，促进了离子传输。此外，LVO 纳米粒子沿纳米纤维均匀分散，有效抑制了粒子聚集。所获得的 LVO/PNC NF 被评估为 LIB 的阳极，在 0.2 A g-1 的条件下循环 300 次后，可提供 768 mAh g-1 的高可逆容量，同时还具有出色的速率能力（在 8 A g-1 的条件下循环 6 次后，平均容量为 355 mAh g-1）和长循环寿命（在 4 A g-1 的条件下循环 2000 次后，平均容量为 286 mAh g-1）。这种特殊的多孔纳米纤维是提高电子导电性、抑制颗粒聚集和确保离子/电荷快速传输的有效策略，可用于先进的储能技术。

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引用次数: 0

Preparation of TiO2 nanoparticles decorated porous carbon via a pseudo co-templating strategy and their application as substrates for high performance cathode of LiS batteries 通过伪共模板策略制备装饰多孔碳的 TiO2 纳米粒子，并将其用作高性能锂离子电池阴极的基板

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-10-16 DOI: 10.1016/j.est.2024.114219

Lithium‑sulfur batteries (LSBs) with a high theoretical specific capacity are considered as one of the most promising energy storage devices for next-generation. However, issues such as the insulation of pristine sulfur, the shuttle effect of polysulfides (LiPSs), and the volume change of sulfur cathode during cycling hinder their commercial applications. In this work, composite microspheres of TiO₂@p-C consisting of porous carbon decorated with TiO₂ nanoparticles, have been designed and synthesized aiming to confine and trap the polysulfides inside the porous substrates and to improve the kinetics of the electrochemical reaction therein. TiO₂ particles with size of a few nanometers are prepared by a tetraethyl ammonium hydroxide assisted sol-gel method. Composite microspheres of TiO₂@p-C are created through spray drying technique using chitosan as carbon source, and nanoparticles of SiO₂ with TiO₂ as co-template while selectively etching of the former. The confinement effects via the pores in the TiO₂@p-C microspheres and the affinity between the polar TiO₂ moieties and the polysulfide species work synergistically, alleviating the effusion of the polysulfides and promoting the conversion reaction of them as well. As a result, the shuttle effect of polysulfides can be inhibited obviously. Significantly, the S@TiO₂@p-C-2 composite cathode exhibits excellent cyclic performance of 1263 mAh g⁻¹ at 0.2C and maintains still a discharge capacity of 809 mAh g⁻¹ after 100 charge and discharge cycles. At a current density of 2C, it still delivers an outstanding specific capacity of 772 mAh g⁻¹. In the case of high sulfur load up to 90 wt%, the discharge capacity of S@TiO₂@p-C-2 composite electrode could still maintain at 469.5 mAh g⁻¹ after 100 cycles under current density of 0.2C.

具有高理论比容量的锂硫电池（LSB）被认为是下一代最有前途的储能设备之一。然而，原始硫的绝缘性、多硫化物（LiPSs）的穿梭效应以及硫阴极在循环过程中的体积变化等问题阻碍了它们的商业应用。本研究设计并合成了由多孔碳和 TiO2 纳米颗粒组成的 TiO2@p-C 复合微球，旨在将多硫化物限制和捕获在多孔基底内，并改善其中的电化学反应动力学。通过四乙基氢氧化铵辅助溶胶-凝胶法制备了几纳米大小的二氧化钛颗粒。以壳聚糖为碳源，通过喷雾干燥技术制备出 TiO2@p-C 复合微球；以 TiO2 为辅助模板，通过选择性蚀刻前者制备出 SiO2 纳米粒子。通过 TiO2@p-C 微球中的孔隙产生的约束效应以及极性 TiO2 分子与多硫化物之间的亲和力协同作用，缓解了多硫化物的渗出，同时也促进了它们的转化反应。因此，可以明显抑制多硫化物的穿梭效应。值得注意的是，S@TiO2@p-C-2 复合阴极在 0.2C 时具有 1263 mAh g-1 的优异循环性能，在 100 次充放电循环后仍能保持 809 mAh g-1 的放电容量。在电流密度为 2C 时，它仍能提供 772 mAh g-1 的出色比容量。在硫负荷高达 90 wt% 的情况下，S@TiO2@p-C-2 复合电极的放电容量在 0.2C 的电流密度下循环 100 次后仍能保持在 469.5 mAh g-1 的水平。

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引用次数: 0

An adaptive co-state design method for PMP-based energy management of plug-in hybrid electric vehicles based on fuzzy logical control 基于模糊逻辑控制的插电式混合动力电动汽车 PMP 能源管理的自适应共态设计方法

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-10-16 DOI: 10.1016/j.est.2024.114118

The determination of the optimal co-state in Pontryagin's minimum principle-based (PMP-based) energy management strategy (EMS) in real-time remains a significant challenge. This paper proposes a fuzzy logic-based approach to tackle this problem. Firstly, an offline optimization method based on the multi-island genetic algorithm (MIGA) is proposed to calculate the optimal co-state of the PMP-based EMS for a plug-in hybrid electric vehicle (PHEV) based on the provided driving cycles. Secondly, a comprehensive evaluation of the influence on the optimal co-state is conducted based on the vehicle's velocity and load, utilizing real-life and representative driving scenarios. Subsequently, a fuzzy logic-based controller is formulated for online modification of the co-state, with inputs including vehicle velocity, load, and acceleration. Finally, the proposed method is evaluated against benchmarks including dynamic programming (DP), charge-depleting and charge-sustaining (CD-CS), and PMP-constant solutions using nine actual driving cycles. The findings demonstrate that the controller with the fuzzy logic method displays significant adaptability to diverse driving cycles. The proposed PMP-adaptive strategy exhibits significant improvement compared to CD-CS, with energy-saving effectiveness approaching DP solutions. In addition, the computational efficiency of the PMP-adaptive is superior to that of the CD-CS, which presents a valuable advantage for real-time applications.

如何实时确定基于庞特里亚金最小原理（PMP）的能源管理战略（EMS）中的最佳协同状态，仍然是一个重大挑战。本文提出了一种基于模糊逻辑的方法来解决这一问题。首先，本文提出了一种基于多岛遗传算法（MIGA）的离线优化方法，根据所提供的驾驶周期计算插电式混合动力电动汽车（PHEV）基于 PMP 的能源管理策略的最佳协同状态。其次，根据车辆的速度和负载，利用现实生活中具有代表性的驾驶场景，对最佳共同状态的影响进行了综合评估。随后，制定了基于模糊逻辑的控制器，用于在线修改共线状态，输入包括车辆速度、负载和加速度。最后，利用九个实际驾驶周期，对照动态编程（DP）、电荷消耗和电荷维持（CD-CS）以及 PMP-恒定解决方案等基准，对所提出的方法进行了评估。结果表明，采用模糊逻辑方法的控制器对不同的驾驶循环具有显著的适应性。与 CD-CS 相比，拟议的 PMP 自适应策略有了显著改善，节能效果接近 DP 解决方案。此外，PMP-自适应的计算效率优于 CD-CS，这为实时应用提供了宝贵的优势。

{"title":"An adaptive co-state design method for PMP-based energy management of plug-in hybrid electric vehicles based on fuzzy logical control","authors":"","doi":"10.1016/j.est.2024.114118","DOIUrl":"10.1016/j.est.2024.114118","url":null,"abstract":"<div><div>The determination of the optimal co-state in Pontryagin's minimum principle-based (PMP-based) energy management strategy (EMS) in real-time remains a significant challenge. This paper proposes a fuzzy logic-based approach to tackle this problem. Firstly, an offline optimization method based on the multi-island genetic algorithm (MIGA) is proposed to calculate the optimal co-state of the PMP-based EMS for a plug-in hybrid electric vehicle (PHEV) based on the provided driving cycles. Secondly, a comprehensive evaluation of the influence on the optimal co-state is conducted based on the vehicle's velocity and load, utilizing real-life and representative driving scenarios. Subsequently, a fuzzy logic-based controller is formulated for online modification of the co-state, with inputs including vehicle velocity, load, and acceleration. Finally, the proposed method is evaluated against benchmarks including dynamic programming (DP), charge-depleting and charge-sustaining (CD-CS), and PMP-constant solutions using nine actual driving cycles. The findings demonstrate that the controller with the fuzzy logic method displays significant adaptability to diverse driving cycles. The proposed PMP-adaptive strategy exhibits significant improvement compared to CD-CS, with energy-saving effectiveness approaching DP solutions. In addition, the computational efficiency of the PMP-adaptive is superior to that of the CD-CS, which presents a valuable advantage for real-time applications.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142444552","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}

引用次数: 0

Accelerating float current measurement with temperature ramps revealing entropy insights 利用温度斜坡加速浮子电流测量，揭示熵的奥秘

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-10-16 DOI: 10.1016/j.est.2024.114142

This research examines the behavior of three types of lithium-ion cells during a voltage hold, precisely measuring the necessary float current

I_{Float}

during stepwise changes and temperature ramps from 5 to 50 °C to increase data acquisition rate and speed compared to stepwise approaches. The float current is thereby associated with calendar aging and superimposed by entropy effects in case of temperature ramps. By combining upward and downward ramps and different ramp speeds, the shares of entropy and aging can be separated. Thereby, the entropy-induced current

I_{E}

across all tested cells is not constant but increases linearly with temperature. This linearity, coupled with direct proportionality between

I_{E}

and the temperature ramp speed, underscores the predictability of the entropy effect in these cells under varying temperature conditions. With the knowledge of the entropy current, the aging current

I_{Aging}

can be derived from temperature ramps and is compared with the state-of-the-art measurements during temperature steps, employing two evaluation methods. While 9 out of 12 cells show high agreement. Significant discrepancies are observed at lower voltages, particularly for high capacity NMC/NCA-cells. Kinetic effects and measurement limitations at low aging currents are expected to be the root cause, especially for upward ramps starting from cold temperatures.

这项研究考察了三种类型的锂离子电池在电压保持期间的行为，精确测量了分步变化和 5 至 50 °C 温度斜坡期间所需的浮动电流 IFloat，与分步方法相比，提高了数据采集率和速度。因此，浮动电流与日历老化相关联，并在温度骤降时与熵效应叠加。通过将上升和下降斜坡以及不同的斜坡速度结合起来，可以将熵和老化的份额分开。因此，所有测试电池的熵诱导电流 IE 并非恒定不变，而是随温度线性增加。这种线性关系，加上 IE 与温度斜坡速度之间的直接比例关系，强调了这些电池在不同温度条件下的熵效应的可预测性。有了熵电流的知识，就可以通过温度斜坡推导出老化电流 IAging，并采用两种评估方法与温度阶跃期间的最新测量结果进行比较。12 个电池中有 9 个显示出高度一致。在较低电压下，尤其是高容量 NMC/NCA 电池的测量结果存在明显差异。在低老化电流下的动力学效应和测量局限性预计是根本原因，尤其是在从低温开始的上升阶段。

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引用次数: 0

Insights into CaCl2-NaCl-KCl molten salt: A machine learning approach to unraveling structure and properties 洞察 CaCl2-NaCl-KCl 熔盐：揭示结构和特性的机器学习方法

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-10-16 DOI: 10.1016/j.est.2024.114156

The CaCl₂-NaCl-KCl molten salt exhibits unique advantages in cost, performance, and environmental impact, making it an exceptionally attractive option for Concentrated Solar Power (CSP) systems. This study focuses on investigating the microstructure and physicochemical properties of CaCl₂-NaCl-KCl molten salt at varying CaCl₂ concentrations using the machine learning (ML) potential. The strength of chloride ions and cation interactions is Ca²⁺ > Na⁺ > K⁺. The geometries of the first coordination shells surrounding Ca²⁺, Na⁺, and K⁺ ions with Cl⁻ are all distorted octahedral structures, and this distortion is more severe with increasing CaCl₂ content. As more CaCl₂ is present in the system, the structure becomes more compact due to the transition from a low coordination structure to high coordination structure. In addition, the simulated density, self-diffusion coefficient, shear viscosity and electrical conductivity were obtained under different CaCl₂ molar fraction. The exploration of diverse composition in CaCl₂-NaCl-KCl molten salt holds the potential to advance the design and execution of CSP systems, fostering enhanced efficiency, cost-effectiveness, and environmental sustainability. Furthermore, it can contribute to the scientific understanding of CaCl₂-NaCl-KCl molten salt as a heat transfer and energy storage medium.

CaCl2-NaCl-KCl 熔盐在成本、性能和环境影响方面具有独特的优势，使其成为聚光太阳能（CSP）系统中极具吸引力的选择。本研究利用机器学习（ML）潜能，重点研究了不同 CaCl2 浓度下 CaCl2-NaCl-KCl 熔盐的微观结构和物理化学特性。氯离子与阳离子的相互作用强度为 Ca2+ > Na+ > K+。围绕着 Ca2+、Na+ 和 K+ 离子的第一配位层与 Cl- 的几何结构都是扭曲的八面体结构，而且这种扭曲随着 CaCl2 含量的增加而更加严重。随着体系中 CaCl2 含量的增加，由于从低配位结构过渡到高配位结构，结构变得更加紧凑。此外，还得到了不同 CaCl2 摩尔分数下的模拟密度、自扩散系数、剪切粘度和导电率。对 CaCl2-NaCl-KCl 熔盐中不同成分的探索有望推动 CSP 系统的设计和实施，提高效率、成本效益和环境可持续性。此外，它还有助于从科学角度理解 CaCl2-NaCl-KCl 熔盐作为传热和储能介质的作用。

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引用次数: 0

Recyclable cellulose-based vitrimer electrolytes for lithium ion batteries 用于锂离子电池的可回收纤维素基三聚氰胺电解质

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-10-16 DOI: 10.1016/j.est.2024.114175

Cellulose as polymer electrolytes in lithium-ion batteries (LIBs) has a number of advantages such as low cost, readily available, abundant, environmentally friendly, and contains electron-donating groups within its structure. Beside, vitrimers are a novel class of polymer materials made of dynamic covalent networks that can undergo bond-exchange processes. Beyond cellulose's special qualities, cellulose-based vitrimer production is highly desired for enhancing electrolytes mechanical qualities, thermal stability, cyclability, and ionic conductivity. In this study, cellulose-based vitrimeric polymer electrolytes are prepared. At first, poly(glycidyl methacrylate-co-methyl acrylate) by different ratios of comonomers is prepared and then cellulose is cross-linked by prepared copolymers. Prepared vitrimers are recycled four steps through transesterification reaction and as-prepared and recycled crosslinked celluloses are used as gel polymer electrolytes (GPEs). The results showed the best ionic conductivity of as-prepared samples in order of 10⁻⁴ S/cm whereas ionic conductivity increased to order of 10⁻³ S/cm for recycled samples. Also, high lithium-ion transfer number of >0.8 was achieved for recycled samples. All as-prepared and recycled electrolytes had excellent electrochemical stability window (> 5 V). Also, improved specific capacity (>178 mA h g⁻¹ with capacity retention upper than 90 % after 200 cycles at 0.2C of LiCoO₂/GPEs/Gr) was attained.

纤维素作为锂离子电池（LIB）的聚合物电解质具有成本低、易于获得、资源丰富、环保以及结构中含有电子捐献基团等诸多优点。此外，玻璃聚合物是一类由动态共价网络组成的新型聚合物材料，可以进行键交换过程。除了纤维素的特殊品质外，纤维素基玻璃聚合物的生产在提高电解质的机械品质、热稳定性、可循环性和离子导电性方面也有很高的需求。本研究制备了纤维素基三聚体聚合物电解质。首先用不同比例的共聚单体制备聚（甲基丙烯酸缩水甘油酯-丙烯酸甲酯），然后用制备的共聚物交联纤维素。通过酯交换反应将制备好的三聚体循环使用四个步骤，然后将制备好的纤维素和循环交联的纤维素用作凝胶聚合物电解质（GPE）。结果表明，原样制备的样品离子传导性最好，约为 10-4 S/cm，而回收样品的离子传导性则提高到 10-3 S/cm。此外，回收样品的锂离子转移数高达 0.8。所有制备的和回收的电解质都具有出色的电化学稳定性窗口（5 V）。此外，还提高了比容量（>178 mA h g-1，钴酸锂/GPEs/Gr 在 0.2C 下循环 200 次后容量保持率高于 90%）。

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引用次数: 0

Porous NiO/CuCo2O4 nanocrystalline heterojunction composites derived from polymetallic coordination polymers for advanced supercapacitor 用于先进超级电容器的多金属配位聚合物衍生多孔 NiO/CuCo2O4 纳米晶异质结复合材料

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-10-16 DOI: 10.1016/j.est.2024.114150

NiO is considered as a promising electrode material owing to its high theoretical capacitance. However, the inherent low conductivity and huge volume expansion during cycling limit its practical application. Constructing composites is considered as an effective way to improve charge transfer efficiency and enhance electrochemical performance. Therefore, many researchers are devoted to combining NiO with other materials to build composites to solve this problem. However, the preparation of composites with uniformly distributed heterojunctions in a simple way remains a major challenge. Herein, porous NiO/CuCo₂O₄ composites with uniformly distributed heterojunctions were fabricated via a facile and cost-effective method. Benefiting from the porous structure and the synergistic effect of NiO and CuCo₂O₄, the NiO/CuCo₂O₄–450 electrode exhibits outstanding specific capacitance of 962 F g⁻¹ at the current density of 1 A g⁻¹. Additionally, with porous NiO/CuCo₂O₄–450 composites as anode and active carbon (AC) as cathode, the asymmetric supercapacitor (ASC) provides an energy density of 25.17 Wh kg⁻¹ at a power density of 400 W kg⁻¹ and an excellent cycle life. This study provides a facile and favourable strategy for the preparation of composites with distinguished electrochemical properties.

由于理论电容较高，氧化镍被认为是一种前景广阔的电极材料。然而，其固有的低电导率和循环过程中巨大的体积膨胀限制了它的实际应用。构建复合材料被认为是提高电荷转移效率和增强电化学性能的有效方法。因此，许多研究人员致力于将氧化镍与其他材料结合起来制备复合材料，以解决这一问题。然而，如何以简单的方法制备具有均匀分布异质结的复合材料仍是一大挑战。本文通过一种简便、经济的方法制备了具有均匀分布异质结的多孔 NiO/CuCo2O4 复合材料。得益于多孔结构以及 NiO 和 CuCo2O4 的协同效应，NiO/CuCo2O4-450 电极在 1 A g-1 的电流密度下表现出了 962 F g-1 的出色比电容。此外，以多孔 NiO/CuCo2O4-450 复合材料为阳极、活性碳（AC）为阴极的非对称超级电容器（ASC）在功率密度为 400 W kg-1 时可提供 25.17 Wh kg-1 的能量密度和出色的循环寿命。这项研究为制备具有优异电化学性能的复合材料提供了一种简便而有利的策略。

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引用次数: 0

Effects of methyl orange on the H2/brine wettability of carbonate rocks: Implications for H2 geo-storage 甲基橙对碳酸盐岩的 H2/卤水润湿性的影响：对 H2 地质储存的影响

IF 8.9 2区工程技术 Q1 ENERGY & FUELS

Journal of energy storage

Pub Date : 2024-10-16 DOI: 10.1016/j.est.2024.114076

Nowadays, researchers have shown interest in hydrogen energy because it is regarded as a clean energy and a viable alternative to carbon-based fossil fuels. However, hydrogen has low volumetric energy density and must be stored in large volumes to fulfil global energy demands. Underground hydrogen storage in a geological structure is considered the best choice due to its safety and higher storage capacity than surface storage. In this study, the advancing

(θ_{a})

and receding

(θ_{r})

contact angles of the stearic acid–aged calcite before and after the treatment with different concentrations (10–100 mg/L) of methyl orange (MO) were measured at reservoir conditions (pressure range: 1–15 MPa, temperatures of 25 °C and 50 °C, and constant salinity of 0.3 M). Moreover, atomic force microscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy were used to characterize the effects of MO on stearic acid–aged calcite. The findings demonstrated that stearic acid–aged calcite exhibited hydrophobic condition (H₂-wet); however, the wettability of the stearic acid–aged calcite was restored to the original hydrophilic condition (water-wet) upon treatment with optimum MO concentration (100 mg/L). The surface roughness of pure calcite increased from 5.4 nm to 137 nm when modified with stearic acid due to the adsorption of organic acid molecules on the surface. However, the surface roughness further decreased from 137 to 49 nm when treated with MO, showing that MO treatment increased the rock water's wetting tendency. This research highlights the importance of the MO injection into an underground reservoir that could provide a better solution to subside the negative effects of discharging MO into the environment and maximise the storage capacity of H₂.

如今，研究人员对氢能产生了浓厚的兴趣，因为氢能被认为是一种清洁能源，是碳基化石燃料的可行替代品。然而，氢的体积能量密度较低，必须大量储存才能满足全球能源需求。与地面存储相比，地质结构中的地下氢存储因其安全性和更高的存储容量而被认为是最佳选择。本研究在储氢条件下（压力范围：1-15 兆帕；温度范围：25℃；压力范围：1-15 兆帕；温度范围：25℃）测量了硬脂酸老化方解石在使用不同浓度（10-100 毫克/升）的甲基橙（MO）处理前后的前进θa 和后退θr 接触角：1-15 兆帕，温度分别为 25 °C 和 50 °C，盐度恒定为 0.3 M）。此外，还使用原子力显微镜、扫描电子显微镜和能量色散 X 射线光谱来表征 MO 对硬脂酸老化方解石的影响。研究结果表明，硬脂酸老化方解石表现出疏水状态（H2-湿）；但在使用最佳浓度（100 毫克/升）的 MO 处理后，硬脂酸老化方解石的润湿性恢复到原来的亲水状态（水-湿）。用硬脂酸改性后，由于表面吸附了有机酸分子，纯方解石的表面粗糙度从 5.4 nm 增加到 137 nm。然而，经 MO 处理后，表面粗糙度进一步从 137 nm 降至 49 nm，这表明 MO 处理增加了岩石水的润湿倾向。这项研究强调了向地下水库注入 MO 的重要性，它可以提供一种更好的解决方案，缓解向环境排放 MO 所带来的负面影响，并最大限度地提高 H2 的储存能力。

{"title":"Effects of methyl orange on the H2/brine wettability of carbonate rocks: Implications for H2 geo-storage","authors":"","doi":"10.1016/j.est.2024.114076","DOIUrl":"10.1016/j.est.2024.114076","url":null,"abstract":"<div><div>Nowadays, researchers have shown interest in hydrogen energy because it is regarded as a clean energy and a viable alternative to carbon-based fossil fuels. However, hydrogen has low volumetric energy density and must be stored in large volumes to fulfil global energy demands. Underground hydrogen storage in a geological structure is considered the best choice due to its safety and higher storage capacity than surface storage. In this study, the advancing <span><math><mfenced><msub><mi>θ</mi><mi>a</mi></msub></mfenced></math></span> and receding <span><math><mfenced><msub><mi>θ</mi><mi>r</mi></msub></mfenced></math></span> contact angles of the stearic acid–aged calcite before and after the treatment with different concentrations (10–100 mg/L) of methyl orange (MO) were measured at reservoir conditions (pressure range: 1–15 MPa, temperatures of 25 °C and 50 °C, and constant salinity of 0.3 M). Moreover, atomic force microscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy were used to characterize the effects of MO on stearic acid–aged calcite. The findings demonstrated that stearic acid–aged calcite exhibited hydrophobic condition (H<sub>2</sub>-wet); however, the wettability of the stearic acid–aged calcite was restored to the original hydrophilic condition (water-wet) upon treatment with optimum MO concentration (100 mg/L). The surface roughness of pure calcite increased from 5.4 nm to 137 nm when modified with stearic acid due to the adsorption of organic acid molecules on the surface. However, the surface roughness further decreased from 137 to 49 nm when treated with MO, showing that MO treatment increased the rock water's wetting tendency. This research highlights the importance of the MO injection into an underground reservoir that could provide a better solution to subside the negative effects of discharging MO into the environment and maximise the storage capacity of H<sub>2</sub>.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142441225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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