尖晶石LiMn_2O_4高温循环性能的改善  

Improved cycling performance of spinel LiMn_2O_4 at elevated temperature

作　　者：丁银[1] 王晓清[1] 阮艳莉[1] 张磊[1] 汤恩旗[1] 

机构地区：[1]天津工业大学环境与化学工程学院,天津300160

出　　处：《电源技术》2012年第9期1266-1269,共4页Chinese Journal of Power Sources

基　　金：国家自然科学青年基金资助项目(20901058)

摘　　要：采用高温固相法合成尖晶石LiMn2O4,从掺杂Al3+稳定晶体结构和包覆抑制锰的溶解两方面来改善尖晶石LiMn2O4的高温电化学性能。实验表明,改善后的正极材料在高温50℃且0.5 C(C=120 mAh/g)下的首次放电比容量为93.3 mAh/g,循环50次后的放电比容量为82.8 mAh/g,比空白样品提高34.1 mAh/g,容量保持率达到88.7%,比空白样品提高39.8%。Spinel LlMn204 cathode materials for lithium-ion batteries were prepared by solid-state method. Different with the conventional methods, two methods were used to Improve the cycling performance of spinel cathode material even at elevated temperature. Al-doped could stabilize the structure of LiMn2O4, and surface coating could inhibit the dissolution of manganese. LiMn2O4 doped with Al^3＋ and coated with LiAlO2 could deliver 93.3mAh/g of discharge specific capacity in the first cycle at 0.5 C （O=120 mAh/g） at 50 ℃. After 50 cycles, the discharge specific capacity was 82.8 mAh/g, which was 34.1 mAh/g higher than the blank sample and the capacity retention is 88.7%, which is 39.8% higher than the blank sample.

关 键 词：锂离子电池 LIMN2O4 AL掺杂 表面包覆 

分 类 号：TM912.9[电气工程—电力电子与电力传动]