Multi-Doped (Ga, B) Li[Ni0.885Co0.100Al0.015]O2 Cathode. Issue 10 (29th June 2020)

• Record Type: Journal Article
• Authors: Seo, Jeong Hyun; Kim, Un-Hyuck; Sun, Yang-Kook; Yoon, Chong S.
• Is Part Of: Journal of the Electrochemical Society. Volume 167:Issue 10(2020)
• Publication Date: 2020-06-29
• Subjects: Li[Ni0.885Co0.100Al0.015]O2 cathode -- Boron and Gallium Multi-Doping -- Lithium-Ion Batteries; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/1945-7111/ab9e82
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : A Ni-rich layered cathode, Li[Ni0.885 Co0.100 Al0.015 ]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.