惰性气氛助力锰酸锂正极材料储锂性能提升  

Inert atmosphere assists in improving the lithium storage performance of lithium manganate cathode materials

作　　者：陈超 李小琴 CHEN Chao;Xiao-qin(School of Mechanical Engineering,Chengdu University,Chengdu 610106,China;Institute for Advanced Study,Chengdu University,Chengdu 610106,China;Sichuan Powder Metallurgy Engineering Technology Research Center,Chengdu 610106,China)

机构地区：[1]成都大学机械工程学院,四川成都610106 [2]成都大学高等研究院,四川成都610106 [3]四川省粉末冶金工程技术研究中心,四川成都610106

出　　处：《化学研究与应用》2024年第1期64-71,共8页Chemical Research and Application

摘　　要：尖晶石锰酸锂(LiMn_(2)O_(4))作为一种不含贵金属和有毒元素的低成本、绿色环保的锂离子电池正极材料,具有广袤的应用与研究前景。本项工作中,利用氩气为惰性气氛,采用高温固相合成法,制备出了粒径均匀、性能优异的LiMn_(2)O_(4)正极材料。利用X射线衍射(XRD)、扫描电子显微镜(SEM)对材料进行了结构表征与分析,进行了充放电循环、循环伏安(CV)和电化学阻抗(EIS)等电化学性能测试,并对煅烧氛围和煅烧温度进行了探讨分析。结果表明,在1 C倍率下,首圈放电比容量为114.2 mAh·g^(-1),100次充放电循环后放电比容量还有98.4 mAh·g^(-1),容量保持率为86.2%。实验证明,惰性气氛对提升LiMn_(2)O_(4)电化学储锂性能行之有效。Spinel lithium manganese(LiMn_(2)O_(4)),as a low-cost and environmentally friendly cathode material,has broad application and research prospects for lithium-ion batteries.In this work,LiMn_(2)O_(4) with uniform particle size and excellent performance were prepared using argon gas as an inert atmosphere.The crystal structure and morphology of the material were characterized and analyzed by X-ray diffraction(XRD)and scanning electron microscopy(SEM).Electrochemical performance tests such as charge/discharge cycling,cyclic voltammetry(CV),and electrochemical impedance spectroscopy(EIS)were conducted.And the calcination atmosphere and temperature were discussed and analyzed.The results show that discharge specific capacity is 114.2 mAh·g^(-1)at 1 C on the first cycle,and there is still 98.4 mAh·g^(-1)after 100 cycles,with a capacity retention rate of 86.2%.Experiments have shown that inert atmosphere is effective in improving the electrochemical lithium storage performance of LiMn_(2)O_(4).

关 键 词：锂离子电池 正极材料 尖晶石锰酸锂 惰性气氛 高温固相法 

分 类 号：O614.7[理学—无机化学]