Synthesis and electrochemical performance of nano TiO2(B)-coated Li”Li0.2Mn0.54Co0.13Ni0.13”O2 cathode material for lithium-ion batteries
Lithium-rich layered metal oxides(LMCNO)are of particular interest for next-generation cathode materials for advanced Li-ion batteries because of their high energy density and voltage plateau.Various challenges,such as large in itial irreversible capacity,inferior cycling stability and fast voltage decay have hindered the practical application.Inspired by good chemical stability of TiO2(B)with organic electrolyte,a series of TiO2(B)-coated Li”Li0.2Mn0.54Co0.13Ni0.13”O2 composites were synthesized by combination of co-precipitation and hydrothermal methods to improve the electrochemical performance of LMCNO cathode materials.Compared with pristine LMCNO sample,the Ti02(B)-coated LMCNO composites show higher reversible capacity,better cycling stability and rate capability.Among them,the 5 wt.%Ti02(B)-coated LMCNO composite show high initial capacity of 258.3 mAh g-1,good capacity retention of 75%after 80 cycles at O.1C,and outstanding rate capability of 105 mAh g-1 even at a high rate of 5C.Notably,the initial Coulombic efficiency is enhanced and the voltage fading is alleviated effectively by the TiO2(B)coating convinced by 400 cycles at 2C.The enhanced electrochemical properties can be attributed to the interface interaction between the TiO2(B)layer and surface of LMCNO and improved thermal stability of TiO2(B)-coated LMCNO composites.
Yishun Wang Yongping Gan Jianfeng Han Yang Xia Hui Huang Jun Zhang Chu Liang Xinyong Tao Wenkui Zhang
College of Materials Science and Engineering,Zhejiang University of Technology Hangzhou,China
国内会议
2017中国(赣州)国际新能源汽车动力电池高峰论坛暨第九届中国储能与动力电池及其关键材料学术研讨与技术交流会
江西赣州
英文
1-1
2017-10-13（万方平台首次上网日期，不代表论文的发表时间）