Nanostructured high-energy cathode materials for advanced lithium batteries
- Authors
- Sun, Yang Kook; Chen, Zonghai; Noh, Hyung-Joo; Lee, Dong-Ju; Jung, Hun-Gi; Ren, Yang; Wang, Steve; Yoon, Chong Seung; Myung, Seung-Taek; Amine, Khalil
- Issue Date
- Nov-2012
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- NATURE MATERIALS, v.11, no.11, pp.942 - 947
- Indexed
- SCIE
SCOPUS
- Journal Title
- NATURE MATERIALS
- Volume
- 11
- Number
- 11
- Start Page
- 942
- End Page
- 947
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/27439
- DOI
- 10.1038/NMAT3435
- ISSN
- 1476-1122
- 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.
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