Use of chloroethylene carbonate as an electrolyte solvent for a graphite anode in a lithium-ion battery
- National Research Council Canada, Ottawa, Ontario (Canada). Inst. for Environmental Research and Technology
The electrolyte decomposition during the first lithiation of graphite is reduced to 90 mAh/g in an electrolyte containing equal volumes of chloroethylene carbonate and a cosolvent of propylene carbonate, dimethyl carbonate, or diethyl carbonate. The volume fraction of chloroethylene carbonate can be further reduced to 0.05 in a trisolvent system with a cosolvent containing equal volumes of ethylene carbonate and propylene carbonate. A lithium-ion cell containing chloroethylene carbonate and propylene carbonate shows a long cycle life. The capacity decreases by 20% from the initial value in over 800 cycles. The charging efficiency is 80 to 90%, is rate dependent, and is accompanied by a self-discharge mechanism. A hypothesis of a chemical shuttle is suggested to explain the low charge efficiency and self-discharge.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 367772
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 7 Vol. 143; ISSN 0013-4651; ISSN JESOAN
- Country of Publication:
- United States
- Language:
- English
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