电解质
X射线光电子能谱
化学
电化学
透射电子显微镜
石墨
自行车
阴极
锂(药物)
化学工程
扫描电子显微镜
电极
泄流深度
分析化学(期刊)
储能
材料科学
复合材料
色谱法
有机化学
工程类
内分泌学
物理
物理化学
功率(物理)
考古
历史
医学
量子力学
作者
Yicun Lin,Hong Zhou,Xiaopeng Yue,Le Yu,Weizhen Fan
标识
DOI:10.1016/j.jelechem.2018.11.046
摘要
Triallyl phosphite (TAPi) was used as an electrolyte additive to improve performance of LiNi0.6Co0.2Mn0.2O2/graphite pouch cells at elevated temperature. The high temperature storage and cycling performances of pouch cells were investigated by various electrochemical methods and microscopy techniques. The results show that TAPi can effectively enhance the discharge capacity retention ratio after high temperature storage test. In the storage experiment, compared with the cells without TAPi, the cells containing 0.5 wt% and 1 wt% TAPi exhibit excellent initial discharge capacity retention of 91.7% and 89.5%, respectively. Besides, for the high temperature cycling at 45 °C, the cells containing 0.5 wt% exhibit optimal cycling performance. The results of X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) suggest that the interfacial film derived from TAPi is helpful for protecting the electrode surface at elevated temperature, thus promoting the capacity performance and retention during the high temperature cycling test. Overall, these results suggest that TAPi can be regarded as a candidate electrolyte addition for lithium-ion batteries with high-nick-content NCM cathode to accommodate elevated temperature condition.
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