不同烧结气氛对尖晶石型LiMn_2O_4电化学性能的影响

Effect of sintering atmosphere on electrochemical performance of spinel LiMn_2O_4

分别用普通烧结炉和湖南化工研究院研发的烧结炉在不通空气和通空气的条件下制备LiMn_2O_4。用X射线衍射(XRD)、扫描电子显微镜(S EM)对产物的结构和微观形貌进行表征,通过充放电性能测试分析了不同气氛对LiMn_2O_4电化学性能的影响。结果表明,制备的LiMn_2O_4均为规则的尖晶石结构,利用湖南化工研究院研发的烧结炉在通气条件下制备的LiMn_2O_4晶体结构最稳定,颗粒大小分布均匀,电化学性能最佳,首次放电比容量为113.0 m Ah/g,循环500次后容量保持率为95.20%,3.4 V平台效率为98.14%。

LiMn2O4 was prepared by ordinary sintering furnace and sintering furnace developed by hunan research institute of chemical industry under the conditions of no air and air, respectively. The structure and micromorphology were characterized by XRD and SEM. Electrochemical properties of LiMn2O4 were investigated with Chargedischarge testing. The result shows that all of LiMn2O4 are regular Spinel structures. LiMn2O4 synthesized by sintering furnace developed by hunan research institute of chemical industry under the conditions of air has the most stable crystal structure and uniform particle size. This kind of LiMn2O4 shows the best electrochemical performance. The first discharge capacity is 113.0 mAh/g, the capacity retention after 500 times cycling is 95.20%, and the efficiency of 3.4 V platform is 98.14%.