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New Insights for the Abuse Tolerance Behavior of LiMn 2 O 4 under High Cut‐Off Potential Conditions
Author(s) -
Zhang Feilong,
Geng Tongtong,
Peng Fengfeng,
Zhao Dongni,
Zhang Ningshuang,
Zhang Haiming,
Li Shiyou
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201801448
Subject(s) - cathode , electrolyte , capacity loss , degradation (telecommunications) , materials science , diffusion , lithium (medication) , ion , fade , electrode , work (physics) , analytical chemistry (journal) , chemistry , electrical engineering , thermodynamics , computer science , physics , medicine , operating system , engineering , organic chemistry , chromatography , endocrinology
The further development of lithium‐ion batteries is often desired to obtain higher capacities by charging to higher potentials. However, such a high potential (>4.3 V) will inevitably result in capacity loss of the LiMn 2 O 4 cathode material over numerous cycles. In this work, degradation mechanisms of LiMn 2 O 4 electrode cycled at different charge cut‐off potentials (4.4, 4.5, 4.6, 4.7, and 4.8 V vs. Li/Li + , respectively) have been investigated. It is found that the capacity degraded seriously after aging cycles at the cut‐off potentials (<4.6 V), especially at 4.4 V. Remarkably, a thicker cathode–electrolyte interface (CEI) film on the cathode surface can be observed when the potential reached 4.7 and 4.8 V. Thus, two degradation mechanisms are proposed, which are also verified by the calculation of the diffusion coefficient of Li + ions (D Li + ). This work demonstrates the relationship between the capacity fade and cut‐off potentials and provides a useful guidance for other cathode materials with high‐voltage operation.