Residual alkali-evoked cross-linked polymer layer for anti-air-sensitivity LiNi_(0.89)Co_(0.06)Mn_(0.05)O_(2)cathode  

作　　者：Chao Zhao Xuebao Li Yun Zhao Jingjing He Yuanpeng Cao Wei Luo Ding Wang Jianguo Duan Xianshu Wang Baohua Li 

机构地区：[1]National and Local Joint Engineering Research Center of Lithium-ion Batteries and Materials Preparation Technology,Key Laboratory of Advanced Battery Materials of Yunnan Province,Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China [2]School of Materials Science and Engineering,Central South University,Changsha 410083,Hunan,China [3]Institute of Materials Research,Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen 518055,Guangdong China [4]City College,Kunming University of Science and Technology,Kunming 650051,Yunnan,China

出　　处：《Journal of Energy Chemistry》2024年第5期450-458,共9页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(52162030);the Yunnan Major Scientific and Technological Projects(202202AG050003);the Key Research and Development Program of Yunnan Province(202103AA080019);the Scientific Research Foundation of Kunming University of Science and Technology(20220122);the Graduate Student Top Innovative Talent Program of Kunming University of Science and Technology(CA23107M139A);the Analysis and Testing Foundation of Kunming University of Science and Technology(2023T20220122);the Shenzhen Science and Technology Program(KCXST20221021111201003)。

摘　　要：High-energy density lithium-ion batteries(LIBs)with layered high-nickel oxide cathodes(LiNi_(x)Co_(y)Mn_(1-x-y)O_(2),x≥0.8)show great promise in consumer electronics and vehicular applications.However,LiNi_(x)Co_(y)Mn_(1-x-y)O_(2)faces challenges related to capacity decay caused by residual alkalis owing to high sensitivity to air.To address this issue,we propose a hazardous substances upcycling method that fundamentally mitigates alkali content and concurrently induces the emergence of an anti-air-sensitive layer on the cathode surface.Through the neutralization of polyacrylic acid(PAA)with residual alkalis and then coupling it with 3-aminopropyl triethoxysilane(KH550),a stable and ion-conductive cross-linked polymer layer is in situ integrated into the LiNi_(0.89)Co_(0.06)Mn_(0.05)O_(2)(NCM)cathode.Our characterization and measurements demonstrate its effectiveness.The NCM material exhibits impressive cycling performance,retaining 88.4%of its capacity after 200 cycles at 5 C and achieving an extraordinary specific capacity of 170.0 mA h g^(-1) at 10 C.Importantly,this layer on the NCM efficiently suppresses unfavorable phase transitions,severe electrolyte degradation,and CO_(2)gas evolution,while maintaining commendable resistance to air exposure.This surface modification strategy shows widespread potential for creating air-stable LiNi_(x)Co_(y)Mn_(1-x-y)O_(2)cathodes,thereby advancing high-performance LIBs.

关 键 词：Lithium-ion batteries Nickel-rich layered cathode Residual alkalis Cross-linked polyme rmodification Airsensitivity 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ317[化学工程—高聚物工业]