期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 24, 页码 27339-27349出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c02459
关键词
high-voltage LiCoO2 cathode; LiNi0.5Mn1.5O4; cycle stability; phase transition; modification
资金
- Department of Education of Guangdong Province [2018KQNCX059]
- Guangdong Basic and Applied Basic Research Foundation [2020A1515011549]
Increasing the upper cutoff voltage is capable of achieving higher charge capacity, whereas this strategy always causes a dramatic degradation of cycling and thermal stability. In this study, we first report spinel LiNi0.5Mn1.5O4-modified LiCoO2 (LiCoO2@LiNi0.5Mn1.5O4) as an outstanding cathode material. LiCoO2@LiNi0.5Mn1.5O4 retains capacity retention of 81.4% in a full cell between 4.45 and 3.00 V after 400 cycles at 0.5 C and is superior to 55.3% of pure LiCoO2. In situ X-ray diffraction at an upper cutoff voltage of 4.75 V in combination with differential capacity curve reveals that the promoted cycling performance is ascribed to a delay of O3 -> H1-3 -> O1 phase transitions and a suppression of cobalt dissolution-induced side reactions. Moreover, LiNi0.5Mn1.5O4 modification improves the thermal stability of LiCoO2 by depressing the release of oxygen and the formation of cobalt dendrites.
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