预嵌锂用穿孔集流体对锂离子电容器电化学性能的影响

引用本文: 蒋江民, 聂平, 董升阳, 吴宇婷, 张校刚. 预嵌锂用穿孔集流体对锂离子电容器电化学性能的影响[J]. 物理化学学报, 2017, 33(4): 780-786. doi: 10.3866/PKU.WHXB201612291 shu

Citation: JIANG Jiang-Min, NIE Ping, DONG Sheng-Yang, WU Yu-Ting, ZHANG Xiao-Gang. Effect of Pre-Punched Current Collector for Lithiation on the Electrochemical Performance of Lithium-Ion Capacitor[J]. Acta Physico-Chimica Sinica, 2017, 33(4): 780-786. doi: 10.3866/PKU.WHXB201612291 shu

预嵌锂用穿孔集流体对锂离子电容器电化学性能的影响

南京航空航天大学材料科学与技术学院, 江苏省能量转换材料与技术重点实验室, 南京 210016
基金项目:
国家重点基础研究发展规划（973）（2014CB239701），国家自然科学基金（51372116，51672128），江苏省自然科学基金（BK20151468），江苏省产学研前瞻性联合研究（BY-2015003-7）及江苏省高校优势学科建设工程（PAPD）资助项目

摘要: 将石墨涂覆于传统铜箔（CCC）与穿孔铜箔（PCC）集流体表面，通过内部短路的方式进行预嵌锂处理，再以商业化的活性炭及预锂化的石墨分别为正、负极材料组装成锂离子电容器（LIC）。以PCC为集流体的LIC在0.1 和2.0 A·g^-1的电流密度下，能量密度分别为118.2 和51.7 Wh·kg^-1，并且在0.5 A·g^-1的电流密度下循环1000 次后的能量密度保持率为90%；以CCC为集流体的LIC在0.1和2.0A·g^-1的电流密度下的能量密度分别为125.5和43.3 Wh·kg^-1，在同等电流密度下2.0-3.8 V之间循环1000次后的能量密度保持率仅为73.2%。进一步研究表明，石墨采用PCC在预嵌锂的过程中避免了金属锂沉积，生成了均一且稳定的固体电解质膜（SEI），有效防止充放电过程中SEI膨胀，活性物质与集流体间粘结力降低，活性物质脱落等现象发生。因此，LIC通过PCC完成预嵌锂后的自放电及内阻更小，具有更佳的倍率性能和循环性能。

关键词:

English

Effect of Pre-Punched Current Collector for Lithiation on the Electrochemical Performance of Lithium-Ion Capacitor

Jiangsu Key Laboratory of Materials and Technology for Energy Conversion, College of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China
Received Date: 20 October 2016
Revised Date: 29 December 2016
Available Online: 29 December 2016
Fund Project:
The project was supported by the National Key Basic Research Program of China (973) (2014CB239701), National Natural Science Foundation of China (51372116, 51672128), Natural Science Foundation of Jiangsu Province, China (BK20151468), Prospective Joint Research Project of Cooperative Innovation Fund of Jiangsu Province, China (BY-2015003-7) and Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions, China (PAPD).

Abstract: Lithium-ion capacitor (LIC) using commercial activated carbon as the cathode and graphite as the anode was assembled. The graphite anode was pre-lithiated by a fast, efficient internal short approach, which involved placing graphite in direct contact with lithium foil with electrolyte additive. The effect of pre-lithiation on the electrochemical performance of the LIC was investigated using a conventional Cu current collector (CCC) and pre-punched Cu current collector (PCC). The LICs containing a CCC and PCC were named CLIC and PLIC, respectively. Although the CCC had slightly higher pre-lithiation level and higher energy density in the CLIC, it suffered from a considerable decrease in performance at higher charge–discharge rates. Meanwhile, 90.0% of the initial capacity was maintained in the PLIC, whereas that of the CLIC was only 73.2% after 1000 cycles in the voltage range from 2.0 to 3.8 V. The CCC led to solid electrolyte interphase (SEI) film expansion and Li metal plating with direct contact between graphite and lithium metal. The deposited thick SEI layer could weaken the adhesion of active materials and the current collector. Moreover, the expansion of the SEI layer itself produced electrical resistance and electrical contact loss between the active materials and current collector. In contrast, a thin, stable SEI layer formed on the surface of graphite after pre-lithiated using the PCC. Therefore, the PLIC showed better rate and cycle performance with the smaller self-discharge, voltage drop, and resistance than those of the CLIC.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

预嵌锂用穿孔集流体对锂离子电容器电化学性能的影响

English

Effect of Pre-Punched Current Collector for Lithiation on the Electrochemical Performance of Lithium-Ion Capacitor

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中国化学会秘书处

预嵌锂用穿孔集流体对锂离子电容器电化学性能的影响

English

Effect of Pre-Punched Current Collector for Lithiation on the Electrochemical Performance of Lithium-Ion Capacitor

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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