Mechanism of capacity fade of MCMB/Li1.1[Ni1/3Mn 1/3Co1/3]0.9O2 cell at elevated temperature and additives to improve its cycle life

Khalil Amine, Zonghai Chen, Z. Zhang, Jun Liu, Wenquan Lu, Yan Qin, Jun Lu, Larry Curtis, Yang Kook Sun

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Abstract

The performance degradation of graphite/Li1.1[Ni 1/3Mn1/3Co1/3]0.9O2 lithium-ion cells at elevated temperature was investigated. The electrochemical data suggest that the migration of dissolved transition metals from the cathode to the anode is the key contributor to the performance degradation. With the help of density function theory calculations, lithium difluoro[oxalato] borate was tested to be an effective electrolyte additive to mitigate the performance degradation of lithium-ion cells. The application of this novel electrolyte additive was found to significantly improve both the life and safety characteristics of graphite/Li1.1[Ni1/3Mn 1/3Co1/3]0.9O2 lithium-ion cells.

Original languageEnglish
Pages (from-to)17754-17759
Number of pages6
JournalJournal of Materials Chemistry
Volume21
Issue number44
DOIs
Publication statusPublished - 2011 Nov 28

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