电解质
材料科学
分离器(采油)
阳极
电化学
相间
碳酸乙烯酯
化学工程
阴极
石墨
锂(药物)
锂离子电池
电极
无机化学
复合材料
电池(电)
化学
热力学
物理
工程类
内分泌学
物理化学
功率(物理)
生物
医学
遗传学
作者
Seong Jin An,Jianlin Li,Claus Daniel,Harry M. Meyer,Stephen E. Trask,Bryant J. Polzin,David L. Wood
标识
DOI:10.1021/acsami.7b03617
摘要
This study aims to explore the correlations between electrolyte volume, electrochemical performance, and properties of the solid electrolyte interphase in pouch cells with Si-graphite composite anodes. The electrolyte is 1.2 M LiPF6 in ethylene carbonate:ethylmethyl carbonate with 10 wt % fluoroethylene carbonate. Single layer pouch cells (100 mA h) were constructed with 15 wt % Si-graphite/LiNi0.5Mn0.3CO0.2O2 electrodes. It is found that a minimum electrolyte volume factor of 3.1 times to the total pore volume of cell components (cathode, anode, and separator) is needed for better cycling stability. Less electrolyte causes increases in ohmic and charge transfer resistances. Lithium dendrites are observed when the electrolyte volume factor is low. The resistances from the anodes become significant as the cells are discharged. Solid electrolyte interphase thickness grows as the electrolyte volume factor increases and is nonuniform after cycling.
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