氧离子导体表面包覆对Li_(2)MnO_(3)正极材料性能的影响  

Effect of surface coating of oxygen ion conductor on properties ofLi_(2)MnO_(3)cathode materials

作　　者：张龙 李东林[1] 刘小九 陆继承 ZHANG Long;LI Donglin;LIU Xiaojiu;LU Jicheng(New Energy Materials and Devices Laboratory,School of Materials Science and Engineering,Chang'an University,Xi'an 710061,China)

机构地区：[1]长安大学材料科学与工程学院,新能源材料和设备实验室,西安710061

出　　处：《功能材料》2023年第10期10136-10142,10154,共8页Journal of Functional Materials

基　　金：国家自然科学基金项目(22179011,21473014)。

摘　　要：针对富锂锰基中Li_(2)MnO_(3)在循环过程中放电平台电压衰减和容量衰减的问题,采用湿化学法用氧离子导体Zr_(0.92)Sr_(0.08)O_(2)对其进行包覆改性,研究结果表明,在250 mA/g电流密度下循环100次,包覆1%Zr_(0.92)Sr_(0.08)O_(2)的Li_(2)MnO_(3)正极材料容量保持率为82.7%,并且极大地抑制了放电平台电压的衰减,而未包覆的Li_(2)MnO_(3)正极材料的容量保持率为44.3%,其放电平台已经消失。这些结果表明氧离子导体Zr_(0.92)Sr_(0.08)O_(2)能有效地抑制Li_(2)MnO_(3)正极材料充放电过程中放电平台电压和容量的衰减。For the problem of discharge plateau voltage decay and capacity decay of Li_(2)MnO_(3)in lithium-rich manganese-based during cycling,the wet chemical method was used to modify it with oxygen ion conductor Zr_(0.92)Sr_(0.08)O_(2).The results showed that the capacity retention of Li_(2)MnO_(3)cathode material coated with 1%Zr_(0.92)Sr_(0.08)O_(2)is 82.7%at 250 mA/g current density for 100 cycles,and greatly suppresses the decay of the discharge plateau voltage,while the capacity retention of the uncoated Li_(2)MnO_(3)cathode material is 44.3%and its discharge plateau has disappeared.These results indicate that the oxygen ion conductor Zr_(0.92)Sr_(0.08)O_(2)can effectively suppress the discharge plateau voltage decay and capacity decay of Li_(2)MnO_(3)cathode material during the charge and discharge process.

关 键 词：Li_(2)MnO_(3) 氧离子导体 包覆 放电平台电压 

分 类 号：TM911[电气工程—电力电子与电力传动]