High-voltage performance of concentration-gradient Li[Ni0 67Co0 15Mn0 18]O-2 cathode material for lithium-ion batteries
- Authors
- Sun, Yang-Kook; Kim, Dong-Hui; Jung, Hun-Gi; Myung, Seung-Taek; Amine, Khalil
- Issue Date
- Dec-2010
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Concentration-gradient; Li[Ni0 67Co0 15Mn0 18]O-2; High capacity; Cathode material; Thermal stability; Lithium batteries
- Citation
- ELECTROCHIMICA ACTA, v.55, no.28, pp.8621 - 8627
- Indexed
- SCIE
SCOPUS
- Journal Title
- ELECTROCHIMICA ACTA
- Volume
- 55
- Number
- 28
- Start Page
- 8621
- End Page
- 8627
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/173385
- DOI
- 10.1016/j.electacta.2010.07.074
- ISSN
- 0013-4686
- Abstract
- A novel Li[Ni0 67Co0 15Mn0 18]O-2 cathode material encapsulated completely within a concentration-gradient shell was successfully synthesized via co-precipitation The Li[Ni0 67Co0 15Mn0 18]O-2 has a core of Li[Ni0 8Co0 15Mn0 05]O-2 that is rich in Ni a concentration-gradient shell having decreasing Ni concentration and increasing Mn concentration toward the particle surface and a stable outer-layer of Li[Ni0 57Co0 15Mn0 28]O-2 The electrochemical and thermal properties of the material were investigated and compared to those of the core Li[Ni0 8Co0 15Mn0 05]O-2 material alone The discharge capacity of the concentration-gradient Li[Ni0 67Co0 15Mn0 18]O-2 electrode increased with increasing upper cutoff voltage to 4 5 V and cells with this cathode material delivered a very high capacity 213 mAh/g with excellent cycling stability even at 55 C The enhanced thermal and lithium intercalation stability of the Li[Ni0 67Co0 15Mn0 18]O-2 was attributed to the gradual no ease in tetravalent Mn concentration and decrease in Ni concentration in the concentration-gradient shell layer .
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