Heuristic solution for achieving long-term cycle stability for Ni-rich layered cathodes at full depth of discharge

Un-Hyuck Kim, Geon-Tae Park, Byoung-Ki Son, Gyeong Won Nam, Jun Liu, Liang-Yin Kuo, Payam Kaghazchi, Chong S. Yoon () and Yang-Kook Sun ()
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Un-Hyuck Kim: Hanyang University
Geon-Tae Park: Hanyang University
Byoung-Ki Son: Hanyang University
Gyeong Won Nam: Hanyang University
Jun Liu: University of Washington
Liang-Yin Kuo: Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, Materials Synthesis and Processing (IEK-1)
Payam Kaghazchi: Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, Materials Synthesis and Processing (IEK-1)
Chong S. Yoon: Hanyang University
Yang-Kook Sun: Hanyang University

Nature Energy, 2020, vol. 5, issue 11, 860-869

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41560-020-00693-6

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