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Electrochemical performance of lithium-ion capacitors evaluated under high temperature and high voltage stress using redox stable electrolytes and additives
Journal of Power Sources ( IF 9.2 ) Pub Date : 2017-11-06 , DOI: 10.1016/j.jpowsour.2017.10.084
Jonathan Boltersdorf , Samuel A. Delp , Jin Yan , Ben Cao , Jim P. Zheng , T. Richard Jow , Jeffrey A. Read

Lithium-ion capacitors (LICs) were investigated for high power, moderate energy density applications for operation in extreme environments with prolonged cycle-life performance. The LICs were assembled as three-layered pouch cells in an asymmetric configuration employing Faradaic pre-lithiated hard carbon anodes and non-Faradaic ion adsorption-desorption activated carbon (AC) cathodes. The capacity retention was measured under high stress conditions, while the design factor explored was electrolyte formulation using a set of carbonates and electrolyte additives, with a focus on their stability. The LIC cells were evaluated using critical performance tests under the following high stress conditions: long-term voltage floating-cycling stability at room temperature (2.2–3.8 V), high temperature storage at 3.8 V, and charge voltages up to 4.4 V. The rate performance of different electrolytes and additives was measured after the initial LIC cell formation for a 1C–10C rate. The presence of vinylene carbonate (VC) and tris (trimethylsilyl) phosphate (TMSP) were found to be essential to the improved electrochemical performance of the LIC cells under all testing conditions.



中文翻译:

使用氧化还原稳定的电解质和添加剂评估锂离子电容器在高温和高压应力下的电化学性能

针对高功率,中等能量密度的应用,对锂离子电容器(LIC)进行了研究,以在具有延长的循环寿命性能的极端环境下运行。LIC组装成三层袋式电池,采用法拉第预锂化硬碳阳极和非法拉第离子吸附-解吸活性炭(AC)阴极,构成不对称配置的三层袋式电池。在高应力条件下测量了容量保持率,而探索的设计因素是使用一组碳酸盐和电解质添加剂的电解质配方,重点是其稳定性。在以下高应力条件下,使用关键性能测试对LIC电池进行了评估:室温(2.2–3.8 V)下的长期电压浮动循环稳定性,3.8 V的高温存储以及高达4.4 V的充电电压。在最初的LIC电池形成后,以1C–10C的速率测量了不同电解质和添加剂的速率性能。发现在所有测试条件下,碳酸亚乙烯酯(VC)和磷酸三(三甲基甲硅烷基)酯(TMSP)的存在对于提高LIC电池的电化学性能至关重要。

更新日期:2017-11-06
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