电解质
锂(药物)
阳极
体积热力学
材料科学
化学工程
石墨
离子
阴极
电化学
锰
无机化学
化学
电极
冶金
热力学
有机化学
医学
物理
物理化学
工程类
内分泌学
作者
Sebastian Klick,Gereon Stahl,Dirk Uwe Sauer
标识
DOI:10.1002/ente.202300566
摘要
Lithium‐ion cells with graphite anodes and nickel–manganese–cobalt oxide (NMC622) cathodes are filled with three different amounts of electrolyte. During formation, incremental capacity analysis indicates small differences in the formation processes between cells with insufficient electrolytes to fill all pores and those with an electrolyte volume above the total pore volume of the cell. Complimentary analysis of the gases developed during formation shows that the composition of these cells differs from the cells with a sufficient electrolyte. The aging of cells under high temperature (60 °C) and high constant voltage of 4.2 V is studied. During aging, cells with higher amounts of electrolyte degrade substantially slower. Based on data available from electrical tests, a theory explaining the volume‐dependent rise of resistance and capacity decay is proposed.
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