期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 34, 页码 31490-31498出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b08949
关键词
lithium-ion battery; cobalt(II) ions; graphite electrode; film forming electrolyte additive; 3-sulflone
资金
- National Natural Science Foundation of China [21573080]
- Guangdong Program for Support of Top-notch Young Professionals [2015TQ01N870]
- Natural Science Foundation for Distinguished Young Scholars of Guangdong Province [2017B030306013]
- Science and Technology Planning Project of Guangdong Province [2017B090901020]
- Special Funds for the Cultivation of Guangdong College Students' Scientific and Technological Innovation (Climbing Program) [pdjh2019b0134]
Co2+ species dissolved from LiCoO2 in lithiumion batteries have been well-established to be responsible for the cell performance fading, especially when the cells are charged to high voltage or at elevated temperatures. The accepted underlying mechanism is the deposition of Co2+ on the graphite anode that destroys the interphase. In this work, we report that the dissolved Co2+ exists in the form of both Co-0 and Co2+ on the graphite anode surface, while Co-0 formed at lithium insertion potential can be reoxidized to Co2+ during charging. Moreover, Co-0 shows a higher catalytic activity than Co2+ toward the reductive decomposition of carbonate electrolyte. An interphase of similar to 4 nm was thus engineered from a film-forming additive 3-sulflone, which completely eliminates the destructive effect of the deposited Co species. The understanding of the destructive role of the dissolved Co2+ on the interphasial stability of the graphite electrode and an effective strategy to suppress such a failure mechanism provides fresh insight into the failure mechanism of manganese-based cathode chemistries, which serves as a better guideline for electrolyte design for future batteries.
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