Thermal reactions of mesocarbon microbead (MCMB) particles in LiPF6-based electrolyte
Thermal reactions of mesocarbon microbead (MCMB) particles in LiPF6-based electrolyte
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DOI：
10.1016/j.jpowsour.2006.07.054
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发表时间：
2006-11
影响因子：
9.2
通讯作者：
A. Xiao;Wentao Li;B. Lucht
中科院分区：
文献类型：
--
作者：
A. Xiao;Wentao Li;B. Lucht
采用NMR、GC-MS、FTIR-ATR、TGA、XPS和SEM/ eds元素图等手段，研究了三元电解质（1.0M lipf6 / 1:1:1碳酸乙烯/碳酸二甲酯/碳酸二乙酯）与介碳微珠（MCMB）颗粒的热反应。三元电解质的热分解不受MCMB颗粒的抑制。在三元电解质的存在下，MCMB颗粒的化学组成和表面形貌发生了显著的变化。电解质分解产物包括低聚碳酸盐、低聚环氧乙烷、聚氧化物（PEO）、氟磷酸锂（LixPOyFz）和氟化锂沉积在MCMB颗粒表面。MCMB表面的分解产物浓度随储存时间和温度的增加而增加。二甲基乙酰胺（DMAc）的加入阻碍了电解液的热分解和电解液分解产物在MCMB表面的沉积。
The thermal reaction of ternary electrolyte (1.0M LiPF6in 1:1:1 ethylene carbonate/dimethyl carbonate/diethyl carbonate) with mesocarbon microbeads (MCMB) particles was investigated by the combined use of NMR, GC–MS, FTIR-ATR, TGA, XPS and SEM/EDS-element map. The thermal decomposition of ternary electrolyte is not inhibited by the presence of MCMB particles. The chemical composition and morphology of the surface of MCMB particles changes significantly upon storage in the presence of ternary electrolyte. Electrolyte decomposition products including oligocarbonates, oligoethylene oxides, polyethylene oxide (PEO), lithium fluorophosphates (LixPOyFz), and lithium fluoride are deposited on the surface of MCMB particles. The concentration of decomposition products on the surface of MCMB increases with increased storage time and temperature. The addition of dimethyl acetamide (DMAc) impedes the thermal decomposition of the electrolyte and deposition of electrolyte decomposition products on the surface of MCMB.