La0.65Sr0.35MnO3@LiMn2O4正极材料在聚合物锂电池中的应用  

Application of La0.65Sr0.35MnO3@LiMn2O4 anode material in lithium polymer battery

作　　者：李庆余 黄德权 赖飞燕 熊庆 王红强 刘国壮 Li Qingyu;Huang Dequan;Lai Feiyan;Xiong Qing;Wang Hongqiang;Liu Guozhuang(Guangxi Key Laboratory of Low Carbon Energy Materials,Guilin 541004;Guangxi Zhuoneng New Energy Technology Co.,Ltd.,Qinzhou 535000)

机构地区：[1]广西师范大学化学与药学学院,桂林541004 [2]广西卓能新能源科技有限公司,钦州535000

出　　处：《化工新型材料》2019年第8期224-227,232,共5页New Chemical Materials

基　　金：广西科学研究与技术开发计划(桂科攻1598008-14、桂科AA16380042);桂林市第一批科学研究与技术开发(2016010502-2、20150106-3)

摘　　要：通过以乙酸镧、乙酸锶和乙酸锰制备的锰酸锶镧(La0.65Sr0.35MnO3)和尖晶石型锰酸锂(LiMn2O4)正极材料作为原料,采用溶胶-凝胶法制备了质量分数分别为0.5%、1.0%和2.0%的锰酸锶镧表面包覆的LiMn2O4正极材料。采用X-射线衍射(XRD)、扫描电镜(SEM)、充放电循环测试等对包覆材料的结构、形貌和电化学性能进行表征,研究不同包覆比例对材料的微观结构、形貌及在502030型电池中电的化学性能。通过XRD和SEM分析可知,包覆锰酸锶镧对锰酸锂的结构并没有改变,当包覆比例为1.0%时,包覆材料分布均匀。对材料进行电化学性能测试发现,纯相LiMn2O4首次放电比容量为94.5mAh/g,循环500周后容量保持率为57.78%;包覆比例为1.0%的LiMn2O4首次放电比容量为106.2mAh/g,循环500周后容量保持率为64.22%,首次放电比容量增加了12.4%,容量保持率提高了6.44%。结果表明,经过包覆后材料的电化学性能得到了明显提高。Based lanthanum acetate,strontium acetate and acetic acid,prepared strontium and manganese acetate manganese strontium lanthanum and spinel lithium manganese acid(LiMn2O4)anode materials as the raw materials,lanthanum strontium manganate surface coated LiMn2O4 anode materials were synthesized through the sol-gel method,which coating quality were 0,0.5%,1.0%and 0.5%,respectively.Using X-ray diffraction(XRD),scanning electron microscopy(SEM)and charge-discharge cycle test,the composition,structure,morphology and electrochemical properties of the target material were characterized.The effects of different coating ratios on the structure,morphology and electrochemical properties of the composites were investigated.By XRD and SEM analysis,it can be seen that the structure of the coated lithium manganate had not changed,and when the coating ratio was 1%,the coating material was evenly distributed.The initial discharge capacity of pure LiMn2O4 was 94.5mAh/g,and the capacity retention rate was 57.78%after 500 cycles.The first discharge capacity of LiMn2O4 with a coating ratio of 1%was 106.2mAh/g.After 500 cycles,the retention rate was 64.22%,the initial discharge capacity increased by 12.4%,and the capacity retention rate increased by 6.44%.The results showed that the material electrochemical properties were obviously improved after the coating.

关 键 词：LIMN2O4 La0.65Sr0.35MnO3涂层 溶胶-凝胶法 软包装锂离子电池 电化学性能 

分 类 号：TM9[电气工程—电力电子与电力传动]