Hybrid ion/electron interfacial regulation stabilizes the cobalt/oxygen redox of ultrahigh-voltage lithium cobalt oxide for fast-charging cyclability

Zhihong Bi ¹Anping Zhang ¹Gongrui Wang ²Cong Dong ¹Pratteek Das ²Xiaoyu Shi ²Zhong-Shuai Wu²

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作者信息

1. State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China;University of Chinese Academy of Sciences,Beijing 100049,China
2. State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China;Dalian National Laboratory of Clean Energy,Chinese Academy of Sciences,Dalian 116023,China
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Abstract

High-voltage and fast-charging LiCoO2(LCO)is key to high-energy/power-density Li-ion batteries.However,unstable surface structure and unfavorable electronic/ionic conductivity severely hinder its high-voltage fast-charging cyclability.Here,we construct a Li/Na-B-Mg-Si-O-F-rich mixed ion/electron interface network on the 4.65 V LCO electrode to enhance its rate capability and long-term cycling sta-bility.Specifically,the resulting artificial hybrid conductive network enhances the reversible conversion of Co3+/4+/O2-/n-redox by the interfacial ion-electron cooperation and suppresses interface side reac-tions,inducing an ultrathin yet compact cathode electrolyte interphase.Simultaneously,the derived near-surface Na+/Mg2+/Si4+-pillared local intercalation structure greatly promotes the Li+diffusion around the 4.55 V phase transition and stabilizes the cathode interface.Finally,excellent 3 C(1 C=274 mA g-1)fast charging performance is demonstrated with 73.8％capacity retention over 1000 cycles.Our findings shed new insights to the fundamental mechanism of interfacial ion/electron synergy in sta-bilizing and enhancing fast-charging cathode materials.

Key words

High-voltage/Fast-charging/LiCoO2/Interfacial ion-electron cooperation/Local intercalation

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基金项目

Nano-X from Suzhou Institute of Nano-Tech and Nano-Bionics,Chinese Academy of Sciences(SINANO)()

National Natural Science Foundation of China(22125903)

National Natural Science Foundation of China(51872283)

National Natural Science Foundation of China(22005298)

National Key R&D Program of China(2022YFA1504100)

National Key R&D Program of China(2023YFB4005204)

Dalian Innovation Support Plan for High Level Talents(2019RT09)

Dalian Institute of Chemical Physics(DICP I2020032)

Joint Fund of the Yulin University and the Dalian National Laboratory for Clean Energy(YLU-DNL Fund 2021002)

Joint Fund of the Yulin University and the Dalian National Laboratory for Clean Energy(YLU-DNL Fund 2021009)

Exploratory Research Project of Yanchang Petroleum International Limited and DICP(ychw-2022ky-01)

出版年

2024

科学通报(英文版)

中国科学院

科学通报(英文版)

CSTPCD

ISSN：1001-6538

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