Home > Publications database > Heuristic solution for achieving long-term cycle stability for Ni-rich layered cathodes at full depth of discharge > print

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100 1 _ |a Kim, Un-Hyuck
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245 _ _ |a Heuristic solution for achieving long-term cycle stability for Ni-rich layered cathodes at full depth of discharge
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520 _ _ |a 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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700 1 _ |a Park, Geon-Tae
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700 1 _ |a Son, Byoung-Ki
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700 1 _ |a Nam, Gyeong Won
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700 1 _ |a Liu, Jun
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700 1 _ |a Kuo, Liang-Yin
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700 1 _ |a Kaghazchi, Payam
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700 1 _ |a Yoon, Chong S.
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700 1 _ |a Sun, Yang-Kook
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773 _ _ |a 10.1038/s41560-020-00693-6
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856 4 _ |y Published on 2020-12-09. Available in OpenAccess from 2021-06-09.
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856 4 _ |y Published on 2020-12-09. Available in OpenAccess from 2021-06-09.
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