合成条件对Li_2MnSiO_4正极材料性能的影响  

Effects of synthesis conditions on performance of Li_2MnSiO_4 as cathode material

作　　者：刘文刚[1] 许云华[1] 周志斌[1] 杨蓉[2] 

机构地区：[1]西安建筑科技大学材料科学与工程学院,陕西西安710055 [2]西安理工大学理学院,陕西西安710048

出　　处：《电源技术》2010年第4期360-362,共3页Chinese Journal of Power Sources

摘　　要：以Li2SiO3和Mn(CH3COO)2·4H2O为原料,采用传统高温固相合成法成功制备出Li2MnSiO4锂离子电池正极材料。研究了合成温度和时间对材料性能的影响。采用XRD、FESEM分析了正极材料的相组成、结构和形貌,利用电池测试仪测试了正极材料的电化学性能。结果表明,随着合成温度的升高和保温时间的延长,合成Li2MnSiO4材料的相纯度提高,结晶度提高,电化学性能随之提高。在900℃保温20h合成的Li2MnSiO4材料得到了118mAh/g的首次循环可逆容量。Li2MnSiO4 cathode material for lithium ion batteries was synthesized by traditional solid-state reaction method used Li2SiO3 and Mn（CH3COO）2·4 H2O as starting materials. The effects of sintering time and temperature on the performance of materials were studied. XRD and FESEM were used to study the phase, structure and morphology of the obtained samples. The electrochemical performance of cathode material was tested. The results show that the electrochemical performance of the Li2MnSiO4 samples is improved with increasing the roasting time and temperature. The Li2MnSiO4 materials roasted at 900 ℃ for 20 h has a best initial specific discharge capacity of 118 mAh/g.

关 键 词：锂离子电池 正极材料 LI2MNSIO4 合成条件 

分 类 号：TM912.9[电气工程—电力电子与电力传动]