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- W4313648814 abstract "Abstract Ni‐rich layered (NRL) cathodes have been widely considered to undergo a degeneration from layered to spinel‐like phases and finally to a rock−salt phase, which jeopardizes the battery's performance and safety. However, this process does not sufficiently explain the drastic structure collapse that occurs during thermal runaway, as the lattice constants of these structures are similar. Herein, an intermediate β‐Li 2 NiO 3 phase is identified during the thermally driven structural evolution via in situ heating scanning transmission electron microscopy imaging. The antihoneycomb‐ordered structure leads to a larger lattice mismatch of up to ∼15% with the layered structure. The resulting strain triggers huge bulk stress and the labile oxygen of the β‐Li 2 NiO 3 phase aggravates the oxygen release, severely reducing the thermal stability of NRL materials. Finally, based on the screening for 3d transition metals, doping elements are chosen to suppress the β‐Li 2 TMO 3 phase and enhance thermal stability. The findings provide comprehensive insights into the structural degradation process of NRL materials and pave the way to design high‐performance and safe battery systems." @default.
- W4313648814 created "2023-01-07" @default.
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- W4313648814 date "2023-01-01" @default.
- W4313648814 modified "2023-10-02" @default.
- W4313648814 title "Critical intermediate β‐Li<sub>2</sub>NiO<sub>3</sub> phase for structural degradation of Ni‐rich layered cathodes during thermal runaway" @default.
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- W4313648814 doi "https://doi.org/10.1002/bte2.20220036" @default.
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