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

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外文摘要：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.

外文关键词：

High-voltageFast-chargingLiCoO2Interfacial ion-electron cooperationLocal intercalation

作者：

Zhihong Bi、Anping Zhang、Gongrui Wang、Cong Dong、Pratteek Das、Xiaoyu Shi、Zhong-Shuai Wu

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作者单位：

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

Dalian National Laboratory of Clean Energy,Chinese Academy of Sciences,Dalian 116023,China

基金：

Nano-X from Suzhou Institute of Nano-Tech and Nano-Bionics,Chinese Academy of Sciences(SINANO)National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Key R&D Program of ChinaNational Key R&D Program of ChinaDalian Innovation Support Plan for High Level TalentsDalian Institute of Chemical PhysicsJoint Fund of the Yulin University and the Dalian National Laboratory for Clean EnergyJoint Fund of the Yulin University and the Dalian National Laboratory for Clean EnergyExploratory Research Project of Yanchang Petroleum International Limited and DICP

项目编号：

2212590351872283220052982022YFA15041002023YFB40052042019RT09DICP I2020032YLU-DNL Fund 2021002YLU-DNL Fund 2021009ychw-2022ky-01

出版年：

2024

DOI：

10.1016/j.scib.2024.04.015

科学通报(英文版)

中国科学院

科学通报(英文版)

CSTPCD

ISSN：1001-6538

年,卷(期)：2024.69(13)