A study of methyl phenyl carbonate and diphenyl carbonate as electrolyte additives for high voltage LiNi0.8Mn0.1Co0.1O2/graphite pouch cells

作者：Qiu, Wenda; Xia, Jian; Chen, Liuping; Dahn, J R^*

来源：Journal of Power Sources, 2016, 318: 228-234.

DOI：10.1016/j.jpowsour.2016.03.105

• Diphenyl carbonate
• Methyl phenyl carbonate
• Electrolyte additives
• Li[Ni0.8Mn0.1Co0.1]O-2/graphite cells
• Long lifetime
• High voltage

The effectiveness of methyl phenyl carbonate and diphenyl carbonate as electrolyte additives either singly or in combination with methylene methyl disulfonate and tris(-trimethyl-silyl)-phosphite has been systematically investigated in LiNi0.8Mn0.1Co0.1O2/graphite pouch cells. Experiments conducted included ultrahigh precision coulometry, electrochemical impedance spectroscopy, automated storage, gas evolution measurements as well as long-term cycling. The results showed that adding methyl phenyl or diphenyl carbonate increases the coulombic efficiency, reduces charge end-point capacity slippage rate, decreases the self-discharge rate during storage and improves the capacity retention during long-term cycling compared to cells with control electrolyte [1 M LiPF6 ethylene carbonate:ethyl methyl carbonate 3:7] or control electrolyte with 2% vinylene carbonate. 1% diphenyl carbonate appears to be the best among the systems studied. Based on these experiments, diphenyl carbonate seems to be a very beneficial additive for improving the performance of high voltage LiNi0.8Mn0.1Co0.1O2/graphite pouch cells.

• 出版日期2016-6-30
• 单位中山大学