Synchronous phase transition and carbon coating on the surface of Li-rich em layered oxide cathode materials for rechargeable Li-ion batteries
- Authors
- Park, Kwangjin; Kim, Juyong; Park, Jun-Ho; Hwang, Yunil; Han, Dongwook
- Issue Date
- 31-Dec-2018
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Lithium-rich layered oxide; Phase transition; Carbon coating; 2,3-Dihydroxynaphthalene (DN); Rechargeable lithium-ion battery
- Citation
- JOURNAL OF POWER SOURCES, v.408, pp.105 - 110
- Journal Title
- JOURNAL OF POWER SOURCES
- Volume
- 408
- Start Page
- 105
- End Page
- 110
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/2957
- DOI
- 10.1016/j.jpowsour.2018.10.001
- ISSN
- 0378-7753
- Abstract
- 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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