期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 16, 期 32, 页码 17062-17071出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4cp02075h
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资金
- IT R&D program of MOTIE (Ministry of Trade, Industry & Energy)/KEIT (Korea Evaluation Institute of Industrial Technology) [10041856]
Lithium-ion batteries with vinylene carbonate (VC) in the electrolyte exhibit superior electrochemical and thermal behavior at elevated temperature, especially with a high Ni content in the cathode material. When VC is added to the electrolyte, polymeric species are formed on the cathode surface by a ring-opening reaction of ethylene carbonate (EC) in the electrolyte and VC, respectively. Through X-ray photoelectron spectroscopy (XPS) depth profiling, we have confirmed that these polymer layers are porous and complementary to each other. XPS results of C1s and O1s show that the outer surface and the inner layer consist of different components. Based on the XPS depth profiling results, we have suggested a reaction mechanism for the formation of a thermally stable layer on the cathode when vinylene carbonate is added to the electrolyte.
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