燃烧温度对尖晶石型LiCr0.05Mn1.95O4正极材料电化学性能的影响  

Influence of combustion temperature on electrochemical property of spinel LiCrMnO cathode material

作　　者：罗学英 张国欣 向明武 郭俊明[1,2] 刘晓芳[1,2] 段开娇[1,2] Luo Xueying;Zhang Guoxin;Xiang Mingwu;Guo J unming;Liu Xiaofang;Duan Kaijiao(Yunnan Minzu University,National and Local Joint Engineering Research Center for Bio-based Materials Green Preparation Technology,Kunming 650500;Yunnan Minzu University,Yunnan Key Laboratory of Green Chemical Materials,Kunming 650500)

机构地区：[1]云南民族大学生物基材料绿色制备技术国家地方联合工程研究中心,昆明650500 [2]云南民族大学云南省高校绿色化学材料重点实验室,昆明650500

出　　处：《化工新型材料》2020年第11期147-151,157,共6页New Chemical Materials

基　　金：国家自然科学基金(51462036和U1602273)。

摘　　要：以醋酸锂、醋酸锰和醋酸铬为原料,采用熔盐燃烧法在300℃、400℃、500℃、600℃一次燃烧反应1h和650℃二次焙烧6h制备LiCr0.05Mn1.95O4正极材料。通过X射线衍射仪和扫描电子显微镜对样品的物相组成、结晶性和形貌进行表征,并用恒电流充放电测试、循环伏安和电化学交流阻抗进行电化学性能测试表征。结果表明:所有样品均具有LiMn2O4的尖晶石结构,没有任何杂质相,颗粒尺寸分布为110~250nm。燃烧温度为500℃合成的LiCr0.05Mn1.95O4正极材料具有较好的电化学性能,在1C、5C和10C倍率,循环100次后,其容量保持率分别为90.29%、91.58%、90.26%。LiCr0.05Mn1.95O4 cathode materials were prepared via a molten-salt combustion method at the first combustion reaction of 300℃,400℃,500℃ and 600℃ for 1 hcombined with the second calcination of 650℃ for 6 h using lithium acetate,manganese acetate and chromium acetate as raw materials.The phase composition,crystallinity and morphology of the as-prepared samples were characterized by XRD and SEM,whilst the electrochemical performance were tested by galvanostatic charge and discharge measurement,cyclic voltammetry and electrochemical alternating current impedance.The results shown that all the samples had the spinel structure of LiMn2 O4,without any impurity phase,the particle size distribution was 110~250 nm.The LiCr0.05Mn1.95O4 synthesized at 500℃ delivered good electrochemical performance,the capacity retention were 90.29%,91.58%,and 90.26% after 100 cycles at 1 C,5 Cand 10 C,respectively.

关 键 词：燃烧反应温度 熔盐燃烧法 锰酸锂 铬掺杂 正极材料 

分 类 号：TM912[电气工程—电力电子与电力传动]