Heuristic solution for achieving long-term cycle stability for Ni-rich layered cathodes at full depth of discharge
- Authors
- Kim, Un-Hyuck; Park, Geon-Tae; Son, Byoung-Ki; Nam, Gyeong Won; Liu, Jun; Kuo, Liang-Yin; Kaghazchi, Payam; Yoon, Chong S.; Sun, Yang-Kook
- Issue Date
- Nov-2020
- Publisher
- NATURE RESEARCH
- Citation
- NATURE ENERGY, v.5, no.11, pp.860 - 869
- Indexed
- SCIE
SCOPUS
- Journal Title
- NATURE ENERGY
- Volume
- 5
- Number
- 11
- Start Page
- 860
- End Page
- 869
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/8803
- DOI
- 10.1038/s41560-020-00693-6
- ISSN
- 2058-7546
- Abstract
- The demand for energy sources with high energy densities continues to push the limits of Ni-rich layered oxides, which are currently the most promising cathode materials in automobile batteries. Although most current research is focused on extending battery life using Ni-rich layered cathodes, long-term cycling stability using a full cell is yet to be demonstrated. Here, we introduce Li[Ni0.90Co0.09Ta0.01]O2, which exhibits 90% capacity retention after 2,000 cycles at full depth of discharge (DOD) and a cathode energy density >850 Wh kg−1. In contrast, the currently most sought-after Li[Ni0.90Co0.09Al0.01]O2 cathode loses ~40% of its initial capacity within 500 cycles at full DOD. Cycling stability is achieved by radially aligned primary particles with [003] crystallographic texture that effectively dissipate the internal strain occurring in the deeply charged state, while the substitution of Ni3+ with higher valence ions induces ordered occupation of Ni ions in the Li slab and stabilizes the delithiated structure.
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