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Unblocking Oxygen Charge Compensation for Stabilized High-Voltage Structure in P2-Type Sodium-Ion Cathode.


ABSTRACT: Layered transition-metal (TM) oxides are ideal hosts for Li+ charge carriers largely due to the occurrence of oxygen charge compensation that stabilizes the layered structure at high voltage. Hence, enabling charge compensation in sodium layered oxides is a fascinating task for extending the cycle life of sodium-ion batteries. Herein a Ti/Mg co-doping strategy for a model P2-Na2/3 Ni1/3 Mn2/3 O2 cathode material is put forward to activate charge compensation through highly hybridized O2 p TM3 d covalent bonds. In this way, the interlayer OO electrostatic repulsion is weakened upon deeply charging, which strongly affects the systematic total energy that transforms the striking P2-O2 interlayer contraction into a moderate solid-solution-type evolution. Accordingly, the cycling stability of the codoped cathode material is improved superiorly over the pristine sample. This study starts a perspective way of optimizing the sodium layered cathodes by rational structural design coupling electrochemical reactions, which can be extended to widespread battery researches.

SUBMITTER: Zhu H 

PROVIDER: S-EPMC9165493 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature

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Unblocking Oxygen Charge Compensation for Stabilized High-Voltage Structure in P2-Type Sodium-Ion Cathode.

Zhu He H   Yao Zhenpeng Z   Zhu Hekang H   Huang Yalan Y   Zhang Jian J   Li Cheng Chao CC   Wiaderek Kamila M KM   Ren Yang Y   Sun Cheng-Jun CJ   Zhou Hua H   Fan Longlong L   Chen Yanan Y   Xia Hui H   Gu Lin L   Lan Si S   Liu Qi Q  

Advanced science (Weinheim, Baden-Wurttemberg, Germany) 20220328 16


Layered transition-metal (TM) oxides are ideal hosts for Li<sup>+</sup> charge carriers largely due to the occurrence of oxygen charge compensation that stabilizes the layered structure at high voltage. Hence, enabling charge compensation in sodium layered oxides is a fascinating task for extending the cycle life of sodium-ion batteries. Herein a Ti/Mg co-doping strategy for a model P2-Na<sub>2/3</sub> Ni<sub>1/3</sub> Mn<sub>2/3</sub> O<sub>2</sub> cathode material is put forward to activate ch  ...[more]

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