Li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3)原位包覆提升单晶三元LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)性能研究  

Study on in-suit coating of Li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3)on single LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) with improved surface performance

作　　者：唐雅婷 鞠博伟 杨乐之 何特特 涂飞跃 TANG Yating;JU Bowei;YANG Lezhi;HE Tete;TU Feiyue(Changsha Research Institute of Mining and Metallurgy Co.,Ltd.,Changsha Hunan 410012,China)

机构地区：[1]长沙矿冶研究院有限责任公司,湖南长沙410012

出　　处：《电源技术》2022年第4期364-367,共4页Chinese Journal of Power Sources

基　　金：湖南省自然科学基金项目(2020JJ5563)。

摘　　要：高镍三元材料因其高容量、低成本而成为最具应用前景的正极材料,但其存在循环性能差、安全性不足等问题。使用溶胶-凝胶法,利用单晶高镍三元材料LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(S-NCM)表面残碱,对S-NCM进行原位Li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3)(LATP)包覆,制备了具有小于10 nm厚度的均匀包覆层的LS-NCM正极材料。在电化学测试中,LS-NCM表现出明显提升的倍率和循环性能,这主要归因于:(1)LATP原位包覆S-NCM可显著降低其表面残碱量;(2)LATP原位包覆S-NCM可提高其表面稳定性,阻止副反应的发生,防止晶内裂纹产生;(3)因LATP具有高离子电导率,LATP原位包覆可减小S-NCM的极化。Ni-rich materials,have become the most promising cathode materials due to their high capacity and low cost.However,during cycling,there are problems such as poor cycle performance and insufficient safety.In this paper,the residual alkali on the surface of the single crystal Ni-rich material LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(S-NCM)was used to form in-situ Li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3)(LATP)layer on S-NCM by sol-gel method,and then prepared LS-NCM cathode having a uniform coating with a thickness of less than 10 nm.LS-NCM exhibits a significantly improved rate and cycle performance in the electrochemical test,mainly attributing to the following reasons:first,the in-situ LATP coating can significantly decrease the amount of residual alkali on S-NCM surface;second,the in-situ LATP coating can improve cathode surface stability,suppress side reactions as well as intragranular cracks;third,due to the high ionic conductivity of LATP,the in-situ coating can reduce the polarization of S-NCM.

关 键 词：LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) 单晶 Li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3) 原位包覆 

分 类 号：TM912.9[电气工程—电力电子与电力传动]