期刊
ADVANCED FUNCTIONAL MATERIALS
卷 20, 期 3, 页码 485-491出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.200901730
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资金
- Korea government (MEST) [2009-0092780]
- US Department of Energy, Vehicle Technologies Office
- National Research Foundation of Korea [2009-0092780, 과C6A1908] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A high-energy functional cathode material with an average composition of Li[Ni(0.72)Co(0.18)Mn(0.10)]O(2), mainly comprising a core material Li[Ni(0.8)Co(0.2)]O(2) encapsulated completely within a stable manganese-rich concentration-gradient shell is successfully synthesized by a co-precipitation process. The Li[Ni(0.72)Co(0.18)Mn(0.10)]O(2) with a concentration-gradient shell has a shell thickness of about 1 mu m and an outer shell composition rich in manganese, Li[Ni(0.55)Co(0.15)Mn(0.30)]O(2). The core material can deliver a very high capacity of over 200 mA h g(-1), while the manganese-rich concentration-gradient shell improves the cycling and thermal stability of the material. These improvements are caused by a gradual and continuous increase of the stable tetravalent Mn in the concentration-gradient shell layer. The electrochemical and thermal properties of this cathode material are found to be far superior to those of the core Li[Ni(0.8)Co(0.2)]O(2) material alone. Electron microscopy also reveals that the original crystal structure of this material remains intact after cycling.
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