The electrochemical performance deterioration mechanism of LiNi_(0.83)Mn_(0.05)Co_(0.12)O_(2)in aqueous slurry and a mitigation strategy  

作　　者：Qingyu Dong Jizhen Qi Jian Wang Lianghao Jia Xuechun Wang Liyi Zhao Yuwei Qian Haiyang Zhang Hui Shao Yanbin Shen Liwei Chen 

机构地区：[1]i-Lab,CAS Center for Excellence in Nanoscience,Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO),Chinese Academy of Sciences(CAS),Suzhou 215123,Jiangsu,China [2]School of Chemistry and Chemical Engineering,Frontiers Science Center for Transformative Molecules,Shanghai Electrochemical Energy Device Research Center(SEED)and In-situ Center for Physical Sciences,Shanghai Jiao Tong University,Shanghai 200240,China [3]Future Battery Research Center,Global Institute of Future Technology,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Journal of Energy Chemistry》2025年第3期443-453,共11页能源化学(英文版)

基　　金：financially supported by the National Key R&D Program of China(2021YFB3800300);the National Natural Science Foundation of China(22179143 and 22309202);the Jiangsu Funding Program for Excellent Postdoctoral Talent;the Gusu Leading Talents Program(ZXL2023190)。

摘　　要：Integrating high-nickel layered oxide cathodes with aqueous slurry electrode preparation routes holds the potential to simultaneously meet the demands for high energy density and low-cost production of lithium-ion batteries.However,the influence of dual exposure to air and liquid water as well as the heating treatment during aqueous slurry electrode processing on the high-nickel layered oxide electrode is yet to be understood.In this study,we systematically investigate the structural evolution and electro-chemical behaviors when LiNi_(0.83)Mn_(0.05)Co_(0.12)O_(2)(NMC83)is subjected to aqueous slurry processing.It was observed that the crystal structure near the surface of NMC83 is partially reconstructed to contain a mixture of rock-salt and layered phases when exposed to water,leading to the deteriorated rate capability of the NMC83 electrodes.This partial surface reconstruction layer completely converts into a pure rock-salt phase upon cycling,accompanied by the release of O_(2),Ni leaching,catalyzed decomposition of the electrolyte,and the formation of a thick cathode electrolyte interphase layer.The byproducts of the electrolyte and dissolved Ni could shuttle to the Li metal side,causing a crosstalk effect that results in a thick and unstable solid electrolyte interphase layer on the Li surface.These in combination severely undermined the cycling stability of the NMC83 electrodes obtained from the aqueous slurry.A mitigation strategy using molecular self-assembly technique was demonstrated to enhance the surface stability of water-treated NMC83.Our findings offer new insights for tailoring ambient environment stability and aqueous slurry processability for ultra-high nickel layered oxide and other water-sensitive cathode materials.

关 键 词：Li-ion battery High-nickel layered oxide cathode Aqueous slurry Surface Reconstruction Molecular self-assembly 

分 类 号：TM912[电气工程—电力电子与电力传动]