期刊
NATURE MATERIALS
卷 11, 期 11, 页码 942-947出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT3435
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- Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Korea government Ministry of Knowledge Economy [20114010203150]
- National Research Foundation of KOREA (NRF)
- Korea government (MEST) [2009-0092780]
- US Department of Energy, EERE
- US Department of Energy [DE-AC02-06CH11357]
- US Department of Energy, Office of Science, Office of Basic Energy Sciences
- National Research Foundation of Korea [2009-0092780, 과C6A1908] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Nickel-rich layered lithium transition-metal oxides, LiNi1-xMxO2 (M = transition metal), have been under intense investigation as high-energy cathode materials for rechargeable lithium batteries because of their high specific capacity and relatively low cost(1-3). However, the commercial deployment of nickel-rich oxides has been severely hindered by their intrinsic poor thermal stability at the fully charged state and insufficient cycle life, especially at elevated temperatures(1-6). Here, we report a nickel-rich lithium transition-metal oxide with a very high capacity (215 mAh g(-1)), where the nickel concentration decreases linearly whereas the manganese concentration increases linearly from the centre to the outer layer of each particle. Using this nano-functional full-gradient approach, we are able to harness the high energy density of the nickel-rich core and the high thermal stability and long life of the manganese-rich outer layers. Moreover, the micrometre-size secondary particles of this cathode material are composed of aligned needle-like nanosize primary particles, resulting in a high rate capability. The experimental results suggest that this nano-functional full-gradient cathode material is promising for applications that require high energy, long calendar life and excellent abuse tolerance such as electric vehicles.
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