Multi-Doped (Ga,B) Li[Ni0.885Co0.100Al0.015]O2Cathode
- Authors
- Seo, Jeong Hyun; Kim, Un-Hyuck; Sun, Yang-Kook; Yoon, Chong Seung
- Issue Date
- Jun-2020
- Publisher
- ELECTROCHEMICAL SOC INC
- Keywords
- Li[Ni0; 885Co0; 100Al0; 015]O(2)cathode; Boron and Gallium Multi-Doping; Lithium-Ion Batteries
- Citation
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.167, no.10, pp.1 - 6
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY
- Volume
- 167
- Number
- 10
- Start Page
- 1
- End Page
- 6
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/9725
- DOI
- 10.1149/1945-7111/ab9e82
- ISSN
- 0013-4651
- Abstract
- A Ni-rich layered cathode, Li[Ni0.885Co0.100Al0.015]O2 (NCA89), was compositionally modified to demonstrate that multiple doping can effectively stabilize the delithiated structure. Incorporation of B and Ga into the cathode substantially improved the cycling stability of the NCA89 cathode. The 0.25 mol% B- and 0.75- mol% Ga- doped NCA89 cathode retained 91.7% of its initial capacity after 100 cycles while delivering a discharge capacity of 222.2 mAh g-1 at 0.1 C, whereas the pristine NCA89 cathode retained only 79.4% of its initial capacity. The multi-doped cathode exhibited excellent long-term cycling stability; it retained 83.4% of the initial capacity after 500 cycles compared to the P-NCA89 cathode that retained only 62.4%. We attributed the improved cycling stability to the incorporation of B, which modified the surface energy to produce a highly aligned microstructure conducive to relieving anisotropic internal strain, and Ga, which provided structural and chemical stability to the O-TM-O slab. Co-doping with Ga and B is an effective strategy to improve the cycling stability of Ni-rich layered cathodes, which are projected to be the power source for next-generation electric vehicles.
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