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Inhibition of oxygen dimerization by local symmetry tuning in Li-rich layered oxides for improved stability.


ABSTRACT: Li-rich layered oxide cathode materials show high capacities in lithium-ion batteries owing to the contribution of the oxygen redox reaction. However, structural accommodation of this reaction usually results in O-O dimerization, leading to oxygen release and poor electrochemical performance. In this study, we propose a new structural response mechanism inhibiting O-O dimerization for the oxygen redox reaction by tuning the local symmetry around the oxygen ions. Compared with regular Li2RuO3, the structural response of the as-prepared local-symmetry-tuned Li2RuO3 to the oxygen redox reaction involves the telescopic O-Ru-O configuration rather than O-O dimerization, which inhibits oxygen release, enabling significantly enhanced cycling stability and negligible voltage decay. This discovery of the new structural response mechanism for the oxygen redox reaction will provide a new scope for the strategy of enhancing the anionic redox stability, paving unexplored pathways toward further development of high capacity Li-rich layered oxides.

SUBMITTER: Ning F 

PROVIDER: S-EPMC7532436 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature

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Inhibition of oxygen dimerization by local symmetry tuning in Li-rich layered oxides for improved stability.

Ning Fanghua F   Li Biao B   Song Jin J   Zuo Yuxuan Y   Shang Huaifang H   Zhao Zimeng Z   Yu Zhen Z   Chu Wangsheng W   Zhang Kun K   Feng Guang G   Wang Xiayan X   Xia Dingguo D  

Nature communications 20201002 1


Li-rich layered oxide cathode materials show high capacities in lithium-ion batteries owing to the contribution of the oxygen redox reaction. However, structural accommodation of this reaction usually results in O-O dimerization, leading to oxygen release and poor electrochemical performance. In this study, we propose a new structural response mechanism inhibiting O-O dimerization for the oxygen redox reaction by tuning the local symmetry around the oxygen ions. Compared with regular Li<sub>2</s  ...[more]

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