首页|Residual alkali-evoked cross-linked polymer layer for anti-air-sensitivity LiNi0.89Co0.06Mn0.05O2 cathode

Residual alkali-evoked cross-linked polymer layer for anti-air-sensitivity LiNi0.89Co0.06Mn0.05O2 cathode

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High-energy density lithium-ion batteries(LIBs)with layered high-nickel oxide cathodes(LiNixCoyMn1-x-yO2,x ≥ 0.8)show great promise in consumer electronics and vehicular applications.However,LiNixCoyMn1-x-yO2 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 LiNi0.89Co0.06Mn0.05O2(NCM)cathode.Our characteri-zation 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 CO2 gas evolution,while maintaining commend-able resistance to air exposure.This surface modification strategy shows widespread potential for creat-ing air-stable LiNixCoyMn1-x-yO2 cathodes,thereby advancing high-performance LIBs.

Lithium-ion batteriesNickel-rich layered cathodeResidual alkalisCross-linked polymer modificationAir sensitivity

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

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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

School of Materials Science and Engineering,Central South University,Changsha 410083,Hunan,China

Institute of Materials Research,Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen 518055,Guangdong China

City College,Kunming University of Science and Technology,Kunming 650051,Yunnan,China

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National Natural Science Foundation of ChinaYunnan Major Scientific and Technological ProjectsKey Research and Development Program of Yunnan ProvinceScientific Research Foundation of Kunming University of Science and TechnologyGraduate Student Top Innovative Talent Program of Kunming University of Science and TechnologyAnalysis and Testing Foundation of Kunming University of Science and TechnologyShenzhen Science and Technology Program

52162030202202AG050003202103AA08001920220122CA23107M139A2023T20220122KCXST20221021111201003

2024

10.1016/j.jechem.2024.01.014

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.92(5)