低温自蔓延燃烧合成Li_(1.2)Fe_(0.2)Mn_(0.6)O_(2)纳米颗粒及电化学性能  

Low temperature self-propagating combustion synthesis and electrochemical properties of Li_(1.2)Fe_(0.2)Mn_(0.6)O_(2) nanoparticles

作　　者：肖雨刚 朱志红 朱永芳 张庆堂[1] XIAO Yugang;ZHU Zhihong;ZHU Yongfang;ZHANG Qingtang(College of Petrochemical Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu,China;Luoyang Polytechnic School,Luoyang 471000,Henan,China)

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730050 [2]洛阳职业技术学院,河南洛阳471000

出　　处：《精细化工》2021年第8期1673-1678,共6页Fine Chemicals

基　　金：国家自然科学基金(21968016、21466020)。

摘　　要：利用自蔓延燃烧在450℃低温下合成了Li_(1.2)Fe_(0.2)Mn_(0.6)O_(2)纳米颗粒(LFMO-450),借助XRD、SEM和TEM及恒流充放电测试研究了其晶体结构、微观形貌、超微结构和电化学性能。结果表明,样品LFMO-450具有良好的α-NaFeO_(2)层状结构,为粒径分布于45~88 nm的纳米颗粒。恒流充放电测试结果表明,在室温及2.0~4.8 V充放电范围内,该样品在电流密度为0.1、0.2、0.5、1和2 C倍率时首次放电比容量分别为237.5、170.7、124.1、101.9和82.8 mA·h/g,表现出良好的倍率性能;在1 C倍率下,样品首次与循环60次后放电比容量分别为106.4和87.8 mA·h/g,容量保持率为82.5%,表现出良好的循环性能。Li_(1.2)Fe_(0.2)Mn_(0.6)O_(2) nanoparticles(LFMO-450)were synthesized by self-propagating combustion at low temperature of 450℃.The crystal structure,micromorphology,ultrastructure and electrochemical properties of LFMO-450 were characterized by XRD,SEM,TEM and galvanostatic charge-discharge test.The results showed that the sample LFMO-450 had a well-ordered layeredα-NaFeO_(2) structure with particle size in the range of 45~88 nm.The galvanostatic charge and discharge test results revealed indicated that the sample exhibited good rate performances.The initial discharge specific capacities at 0.1,0.2,0.5,1 and 2 C rates were up to 237.5,170.7,124.1,101.9 and 82.8 mA·h/g from 2.0 to 4.8 V at room temperature,respectively.At 1 C rate,the initial and 60th cycle discharge specific capacities of the sample were 106.4and 87.8 mA·h/g,and the capacity retention rate was 82.5%,indicating that the sample had good cycle performance.

关 键 词：锂离子电池 富锂铁锰固溶体 Li_(1.2)Fe_(0.2)Mn_(0.6)O_(2) 自蔓延燃烧 有机电化学与工业 

分 类 号：TB383[一般工业技术—材料科学与工程]