Nanostructured high-energy cathode materials for advanced lithium batteries

Title
Nanostructured high-energy cathode materials for advanced lithium batteries
Author
선양국
Keywords
Cathodes; Electric batteries; Electrodes; Lithium; Manganese; Manganese oxide; Metals; Nickel; Secondary batteries; Thermodynamic stability; Transition metal compounds; Transition metals
Issue Date
2012-11
Publisher
Nature Materials; London
Citation
Nature Materials, Vol.11, No.11 [2012], p942-947
Abstract
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. 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. Here, we report a nickel-rich lithium transition-metal oxide with a very high capacity (215?mA?h?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.
URI
http://www.scopus.com/record/display.uri?eid=2-s2.0-84867843425&origin=inward&txGid=434d1005be582511398599002de060b3http://hdl.handle.net/20.500.11754/42849
ISSN
1476-1122
DOI
10.1038/nmat3435
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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