【作者】 关勇辉； 解晶莹； 赵新兵； 曹高劭；

【Author】 Guan Y H , Xie J Y, Zhao X B, Cao G S I.Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai,200050; 2.Department of Material Science and Engineering , Zhengjiang University, Hangzhou 310027

【机构】 中国科学院上海微系统与信息技术研究所能源科学与技术实验室； 浙江大学材料科学与工程系；

【摘要】 采用高温固相反应法制备了具有均一立方相的Mg2+和F-掺杂Li-Mn-O基尖晶石结构的锂离子电池正极材料,并采用XRD、SEM及电化学性能测试等手段对其进行了表征。结果显示,0.5C充放电倍率下,LiMn1.92Mg0.08O4首次放电容量约90mAh/g,较LiMn2O4的102mAh/g低,但循环性能显著提高:300次循环后,容量不发生可察觉衰减;LiMn2O3.96F0.04较LiMn2O4容量与循环寿命都有较大改善,首次放电容量为113mAh/g,经150次和300次循环后容量分别为90 mAh/g和80mAh/g。更多还原

【Abstract】 An isotropically cubic spinel of the Mg2+ or F- -doped Li-Mn-O as the cathode for rechargeable lithium batteries was synthesized by solid state reaction method at 750℃ in air and characterized by XRD.SEM and electrochemical performance testing. It was found that LiM1.92Mg0.08O4, no fading, has much better charge/discharge capacity than LiMn2O4 run for 300 cycles, even though the first discharge capacity of LiMn1.92Mg0.08O4 was 90mAh/g which was lower than LiMn2O4’s 102 mAh/g, at 0.5C charge and discharge rate. A great increasing of capacity and cyclability was achieved using LiMn2O3.96F0.04 in which the discharge capacity in the 1st, 150 th, and 300 th cycles were 113 mAh/g, 90 mAh/g and 80 mAh/g.更多还原