期刊
JOURNAL OF POWER SOURCES
卷 408, 期 -, 页码 105-110出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2018.10.001
关键词
Lithium-rich layered oxide; Phase transition; Carbon coating; 2,3-Dihydroxynaphthalene (DN); Rechargeable lithium-ion battery
资金
- Gachon University [GCU-2018-0300]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2018R1D1A1B07049165]
- National Research Foundation of Korea (NRF) - Korea government(MSIT
- Ministry of Science and ICT) [NRF-2017R1C1B5076956]
- National Research Foundation of Korea [2017R1C1B5076956, 2018R1D1A1B07049165] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We describe a novel synchronous surface tailoring to form thin and uniform carbon coating layers and simultaneously induce an in-situ phase transition from a layered to spinel-like phase on the surfaces of Li-rich layered oxide (LLO) particles by the thermal decomposition of 2,3-dihydroxynaphthalene (DN). The Li2MnO3 component in pristine LLO is not affected during carbon coating, but the coordination numbers of the Co ions and the Co-O bonds in the LiTMO2 phase are diminished during carbon coating, implying that the formation of a spinel-like phase in LLO after carbon coating begins at the LiTMO2 with little variation in the Li2MnO3. As a result, the optimized DN (0.2 wt%)-coated LLO cathode material shows superb electrochemical properties owing to the formation of uniform carbon coating layers and the layered-to spinel-phase transition on the surfaces of the LLO particles, which improves the surface stability, electronic conductivity, and Li-ion kinetics in the LLO.
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