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SCI Article

Nanostructured high-energy cathode materials for advanced lithium batteries
Author
Sun, Yang-Kook (Dept WCU Energy Engn); Noh, Hyung-Joo (Dept WCU Energy Engn); Lee, Dong-Ju (Dept WCU Energy Engn); Jung, Hun-Gi (Dept WCU Energy Engn); Sun, Yang-Kook (Dept Chem Engn); 윤종승 (Dept Mat Sci & Engn);
Corresponding Author Info
Sun, YK (reprint author), Hanyang Univ, Dept WCU Energy Engn, Seoul 133791, South Korea.
E-mail
Document Type
Article
Source
NATURE MATERIALS Volume:11 Issue:11 Pages:942-947 Published:2012
Times Cited
134
External Information
http://dx.doi.org/10.1038/NMAT3435
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(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.
Web of Science Categories
Chemistry, Physical; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter
Funding
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];
Language
English
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