Document Detail

Nanostructured high-energy cathode materials for advanced lithium batteries.
MedLine Citation:
PMID:  23042415     Owner:  NLM     Status:  Publisher    
Nickel-rich layered lithium transition-metal oxides, LiNi(1-x)M(x)O(2) (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.
Yang-Kook Sun; Zonghai Chen; Hyung-Joo Noh; Dong-Ju Lee; Hun-Gi Jung; Yang Ren; Steve Wang; Chong Seung Yoon; Seung-Taek Myung; Khalil Amine
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-07
Journal Detail:
Title:  Nature materials     Volume:  -     ISSN:  1476-1122     ISO Abbreviation:  Nat Mater     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-8     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101155473     Medline TA:  Nat Mater     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
1] Department of WCU Energy Engineering, Hanyang University, Seoul 133-791, South Korea [2] Department of Chemical Engineering, Hanyang University, Seoul 133-791, South Korea.
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