电解质
锂(药物)
电化学
材料科学
石墨
淡出
阳极
硅
化学工程
化学
冶金
电极
计算机科学
工程类
医学
物理化学
内分泌学
操作系统
作者
Ankit Verma,Maxwell C. Schulze,Andrew M. Colclasure,Marco‐Tulio F. Rodrigues,Stephen E. Trask,Krzysztof Z. Pupek,Christopher Johnson,Daniel P. Abraham
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2023-07-01
卷期号:170 (7): 070516-070516
被引量:2
标识
DOI:10.1149/1945-7111/ace65d
摘要
Silicon-based lithium-ion batteries have started to meet cycle life metrics, but they exhibit poor calendar life. Here, electrolyte fluorination impact on calendar fade of blended silicon-graphite anodes is explored using a LiPF 6 in EC:EMC:FEC electrolyte vs LiBOB in EC:EMC electrolyte. We utilize a combined experimental-modeling approach applying potentiostatic voltage holds (V-hold) to evaluate electrolyte suitability for calendar life in a shortened testing timeframe (∼2 months). Our theoretical framework deconvolutes the irreversible parasitic capacity losses (lithium lost to the solid electrolyte interphase) from the V-hold electrochemical data. Unfluorinated electrolyte (dominant LiBOB reduction) exhibits higher cell resistance as compared to fluorinated electrolyte (dominant FEC reduction). Both systems have similar irreversible capacities during the voltage hold duration with slower rate of parasitic capacity loss for the LiBOB system. Extrapolation of the parasitic losses to end of life capacity fade of 20% shows LiBOB electrolyte outperforming LiPF 6 electrolyte in calendar life. The results demonstrate the applicability of the V-hold protocol as a rapid material screening tool providing semi-quantitative calendar lifetime estimates.
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