电解质
碳酸乙烯酯
相间
锂(药物)
材料科学
化学工程
碳酸锂
碳酸盐
化学
离子
电极
冶金
离子键合
有机化学
医学
物理化学
工程类
内分泌学
生物
遗传学
作者
Christian Lechtenfeld,Julius Buchmann,Jan Hagemeister,Marlena M. Bela,Stefan van Wickeren,Sandro Stock,Rüdiger Daub,Simon Wiemers‐Meyer,Martin Winter,Sascha Nowak
标识
DOI:10.1002/advs.202405897
摘要
Abstract Despite a substantial impact on various economic and cell technology factors, the influence of electrolyte quantities is rarely addressed in research. This study examines the impact of varying electrolyte quantities on cell performance and aging processes using three different electrolytes: LP57 (1 M LiPF6 in ethylene carbonate:ethyl methyl carbonate (EC:EMC 3:7 w/w), LP572 (LP57+2 wt.% vinylene carbonate (VC)) and LP57 + absVC (18.351 mg VC). Comprehensive analytical post mortem investigations revealed that continuous excessive electrolyte decomposition determines the performance of cells using LP57, leading to enhanced irreversible lithium‐ion loss and interphase thickening with increasing electrolyte volume. Impedance rise due to the growth of the interphase was also identified as the cause of degrading cell performance with rising amounts of LP572, attributed to an increasingly pronounced consumption of VC rather than electrolyte aging effects. By varying the electrolyte quantity while maintaining a constant amount VC within the cell system, the differences in cell performance were minimized, and observed deteriorating effects were suppressed. This study demonstrates the sensitive interdependence of electrolyte volume and additive concentration, practically affecting aging behavior. Comprehensively understanding the characteristics of each individual electrolyte component and tailoring the electrolytes to cell‐specific cell properties proves to be crucial to optimize cell performance.
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