氧化铝包覆锂离子电池正极材料的研究进展  

Research progress of alumina coated cathode materials for lithium-ion batteries

作　　者：徐前进 徐金钢 田朋 刘坤吉[1] 高婷婷 宁桂玲[2] XU Qianjin;XU Jingang;TIAN Peng;LIU Kunji;GAO Tingting;NING Guiling(Jiangxi Baohtech Science Co.,Ltd.,Yichun 331208,China;Dalian University of technology-Baohong technology lithium battery new material joint research center,Dalian University of technology,Dalian 116024,China)

机构地区：[1]江西宝弘纳米科技有限公司,江西宜春331208 [2]大连理工大学-宝弘科技锂电新材料联合研究中心,大连理工大学,辽宁大连116024

出　　处：《无机盐工业》2023年第1期46-55,117,共11页Inorganic Chemicals Industry

基　　金：江西省技术创新引导类计划项目-科技合作专项(2021BDH81011);江西省主要学科与学术带头人培养项目-领军人才计划(20213BCJ22020)。

摘　　要：锂离子电池正极材料的性能是锂电池技术发展的瓶颈。近年来,为了提高锂离子电池正极材料的循环寿命、热稳定性和倍率性能等,三氧化二铝涂覆正极材料已经被广泛研究。所讨论的三氧化二铝涂层分为粗糙涂层、超薄涂层和厚涂层。简要论述了三氧化二铝表面涂层改善正极材料的作用,如氟化氢清除剂、物理保护屏障、提高锂离子扩散速率、提升正极材料的热稳定性能、与六氟磷酸锂(LiPF_(6))反应生成二氟磷酸锂(LiPO_(2)F_(2))和抑制JahnTeller效应等。介绍表面改性的方法,包括浸渍法、沉淀法、干法包覆、溅射法和原子层沉积法等,以及其对锂离子电池正极材料钴酸锂(LiCoO_(2))、锰酸锂(LiMn_(2)O_(4))、磷酸铁锂(LiFePO_(4))及三元材料(Li-Ni-Co-Mn-O)的影响。最后,展望了三氧化二铝表面包覆和原子层沉积技术的发展前景。The performance of lithium-ion battery cathode materials is the development bottleneck of lithium battery technology.Recently,alumina(Al_(2)O_(3))coated cathode materials have been widely studied in order to improve the cycle life,thermal stability and multiplier properties of lithium-ion batteries.The Al_(2)O_(3) coatings were divided into three different forms of namely rough,ultra-thin and thick coatings.The role of Al2O3surface coatings in improving cathode material performance was briefly discussed,such as HF scavenger,physical protective barrier,increasing lithium ion diffusion rate,improving thermal stability of cathode material,reacting with LiPF_(6)to form electrolyte additive LiPO2F2and inhibiting Jahn-Teller effect,etc.The surface modification methods were introduced,including impregnation method,precipitation method,dry coating process,sputtering method and atomic layer deposition method,etc.and its influence on the cathode materials of lithium cobaltite(LiCoO_(2)),lithium manganite(LiMn_(2)O_(4)),lithium iron phosphate(LiFePO_(4))and ternary material(Li-Ni-Co-MnO).At last,the development trend of Al2O3surface coating and atomic layer deposition technology was prospected.

关 键 词：氧化铝 表面包覆 正极材料 锂离子电池 

分 类 号：TQ131.11[化学工程—无机化工]