Journal
CERAMICS INTERNATIONAL
Volume 44, Issue 11, Pages 13341-13348Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.04.166
Keywords
Lithium ion battery; Ni-rich cathode materials; LiNi0.8Co0.15Al0.05O2; Coating; Storage performance
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Funding
- National Basic Research Program of China [2014CB643406]
- Application Projects of Integrated Standardization and New Paradigm for Intelligent Manufacturing from the Ministry of Industry and Information Technology of China in 2016
- Fundamental Research Funds for the Central Universities of Central South University [2017zzts117]
- collaborative Innovation center of Manganese-Zinc-Vanadium Industrial Technology the 2011 plan of Hunan province)
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The severe degradation of Ni-rich cathode materials on exposure to air is a crucial restriction for their large-scale application. To overcome this issue, a MnO2 functional layer has been introduced to the surface of LiNi0.8Co0.15Al0.05O2 oxide via a wet-chemical method. Compared with pristine sample, the modified LiNi0.8Co0.15Al0.05O2 shows an enhanced chemical stability because of its low sensitivity to moisture and CO2. The formation of absorbed Li2CO3/LiOH species and spontaneous reduction of Ni3+ to Ni2+ on the surface of MnO2-modified sample have been delayed remarkably, which is confirmed by characterizations of SEM, TEM, XPS and FTIR. Benefit from these merits, the modified LiNi0.8Co0.15Al0.05O2 displays a specific capacity of 183 mAh g(-1) at 0.1 C after air-storage for 40 days, while the pristine sample drops from 195 to 144 mAh g(-1) promptly. Meanwhile, the MnO2 layer inhibits the generation of HF and protects the active material against the erosion of electrolyte in the working cell. Therefore, the MnO2 modified LiNi0.8Co0.15Al0.05O2 after storage shows a capacity retention of 87.1% at 1 C after 100 cycles, which is more stable than that of stored pristine sample (70.3%).
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