Mn^(4+)-掺杂锂钒氧化物的合成及其电化学性能  

Synthesis and Electrochemical Performance of Mn^(4+) Doped Lithium Vanadium Oxide

作　　者：陈一维[1] 张颖[1] 汪大云[2] 韩恩山[1] 

机构地区：[1]河北工业大学化工学院,天津300130 [2]河北工业大学理学院,天津300130

出　　处：《材料研究学报》2011年第2期205-208,共4页Chinese Journal of Materials Research

摘　　要：以LiOH·H_2O、NH_4VO_3和Mn(CH_3COO)_2·4H_2O为原料,以柠檬酸(C_6H_8O_7·H_2O)为络合剂,用凝胶溶胶法按xLiV_3O_8·yLiMn_2O_4(x:y=1:0,4:1,8:1,12:1,16:1)合成出锂离子电池正极材料Mn^(4+)-LiV_3O_8,并对其结构和电化学性能进行了研究。结果表明,用该法制备的样品具有良好的层状晶体结构和良好的充放电性能。当x:y=12:1时,在1.8-3.8V范围内以0.1C倍率循环时,首次放电比容量高达387.9mAh/g,比未掺杂Mn^(4+)时(299.9mAh/g)提高了29.3%。经过30次循环后,放电比容量仍保持为376.4mAh/g,充放电效率维持在97%以上。According to the stoichiometric ratio of xLiV3O8·yLiMn_2O_4（x：y=1：0,4：1,8：1,12：1, 16：1）,lithium vanadium oxide Mn^4＋-LiV3O8 was synthesized by a sol-gel method with LiOH·H2O, NH4VO3,Mn（CH3COO）2·4H2O and C6H8O7·H2O as starting materials,and its electrochemical characterization and structure has been investigated.The results show that the Mn^4＋-LiV3O8 made by sol-gel method has well-developed crystal structure of layered LiV3O8 and a good charge-discharge characterization. The initial discharge specific capacity with Mn^4＋ doping at x：y=12：1 reaches 387.9 mAh/g, which is 29.3%larger than that of pure material（299.9 mAh/g）,and keeps 376.4 mAh/g after 30 cycles when cycles at 0.1C rate over the voltage range of 1.8-3.8 V.Further-more,the material preserves a high charge-discharge efficiency above 97%.

关 键 词：无机非金属材料 锂离子电池正极材料 掺杂 循环伏安 溶胶凝胶法 

分 类 号：TM912[电气工程—电力电子与电力传动]