物理化学学报2017，Vol.33Issue(4)：780-786,7.DOI:10.3866/PKU.WHXB201612291
预嵌锂用穿孔集流体对锂离子电容器电化学性能的影响
Effect of Pre-Punched Current Collector for Lithiation on the Electrochemical Performance of Lithium-Ion Capacitor
摘要
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 LlCs 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.关键词
锂离子电容器/穿孔铜箔/预嵌锂/固体电解质膜/集流体Key words
Lithium-ion capacitor/Pre-punched Cu foil/Prelithiation/SEI film/Current collector分类
化学化工引用本文复制引用
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):780-786,7.基金项目
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).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 （973）
