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

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

机构地区：[1]State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Dalian National Laboratory of Clean Energy,Chinese Academy of Sciences,Dalian 116023,China

出　　处：《Science Bulletin》2024年第13期2071-2079,共9页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(22125903,51872283,and 22005298);the National Key R&D Program of China(2022YFA1504100 and 2023YFB4005204);Dalian Innovation Support Plan for High Level Talents(2019RT09);Dalian Institute of Chemical Physics(DICP I2020032);The Joint Fund of the Yulin University and the Dalian National Laboratory for Clean Energy(YLU-DNL Fund 2021002,YLU-DNL Fund 2021009);Exploratory Research Project of Yanchang Petroleum International Limited and DICP(yc-hw-2022ky-01).

摘　　要：High-voltage and fast-charging LiCoO_(2)(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 stability.Specifically,the resulting artificial hybrid conductive network enhances the reversible conversion of Co^(3+)/^(4+)/O_(2)/nredox by the interfacial ion–electron cooperation and suppresses interface side reactions,inducing an ultrathin yet compact cathode electrolyte interphase.Simultaneously,the derived near-surface Na+/Mg2+/Si^(4+)-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 g1)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 stabilizing and enhancing fast-charging cathode materials.

关 键 词：HIGH-VOLTAGE Fast-charging LiCoO_(2) Interfacial ion-electron cooperation Local intercalation 

分 类 号：O64[理学—物理化学]