The Use of Elevated Temperature Storage Experiments to Learn about Parasitic Reactions in Wound LiCoO2∕Graphite Cells

电解质 容量损失 库仑法 溶解 电极 化学 下降(电信) 储能 石墨 分析化学(期刊) 开路电压 材料科学 化学工程 电化学 电压 复合材料 色谱法 电气工程 热力学 有机化学 工程类 物理化学 功率(物理) 物理
作者
Nidhi Sinha,Aaron Smith,J. C. Burns,Gaurav Jain,K. W. Eberman,Erik R. Scott,Jamie Gardner,J. R. Dahn
出处
期刊:Journal of The Electrochemical Society [Institute of Physics]
卷期号:158 (11): A1194-A1194 被引量:150
标识
DOI:10.1149/2.007111jes
摘要

Twenty seven LiCoO2/graphite wound prismatic cells containing a variety of electrolyte additives as well as high or low surface area LiCoO2 were studied during high temperature storage using an automated storage system. The same cells had been previously studied using high precision coulometry. Cells were initially cycled to measure the capacity, charged and then stored for one month at either 40 or 60 °C, then cycled again to measure the reversible and irreversible capacity loss. The process was then repeated. During storage, the open circuit potential was automatically measured every 6 hours. The mechanisms responsible for the voltage drop which occurred during storage and the capacity loss after storage were analysed using a Li inventory model. The voltage drop during storage is caused primarily by parasitic reactions (electrolyte oxidation, transition metal dissolution, etc.) that insert Li into the positive electrode, because the potential of the LixC6 electrode is virtually constant on the stage-2/stage-1 plateau even if its Li content changes due to solid electrolyte interface (SEI) growth. The experimental results show that the combination of the electrolyte additive, vinylene carbonate, and low surface area LiCoO2 minimizes the voltage drop and capacity loss during storage presumably by reducing the amount of electrolyte oxidation occurring at the positive electrode. The same cells had charge endpoint capacity slippages that were closest to 0.00%/cycle during cycling tests monitored with high precision coulometry. Storage experiments, in concert with precision coulometry, allow a clear picture of the effect of additives to be determined.
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