微波碳热还原法制备Li_3V_2(PO_4)_3及其性能研究  

Preparation and Characterization of Li_3V_2(PO_4)_3 via Microwave Carbothermal Reduction Method

作　　者：应皆荣[1] 姜长印[1] 唐昌平[1] 高剑[1] 李维[1] 万春荣[1] 

机构地区：[1]清华大学,北京102201

出　　处：《稀有金属材料与工程》2006年第11期1792-1796,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50002006);国家高技术研究发展计划(863计划)资助

摘　　要：将一定配比的LiOH·H2O,V2O5,H3PO4和蔗糖(C12H22O11)通过球磨均匀混合,烘干后埋入石墨粉中,在功率为800W的家用微波炉中高火加热15min,通过碳热还原合成Li3V2(PO4)3。用X射线衍射和扫描电镜对材料的结构和形貌进行了表征。充放电测试表明,在电压范围为3V^4.3V和3V^4.8V时,Li3V2(PO4)3正极材料具有较高的比容量、优良的循环性能和倍率特性。在电压范围为1.5V^4.8V时,Li3V2(PO4)3正极材料具有很高的比容量,但循环性能较差。该材料有望用于锂离子电池部分取代昂贵的LiCoO2,也可望应用于动力型和储能型锂离子电池。LiOH.H2O, V2O5, H3PO4 and sucrose （C12H22O11） were homogeneously mixed with certain molar ratios by ball-milling, then dried and embedded in graphite powders. The mixed raw materials were heated in a domestic microwave oven operated with the power of 800 W for 15 minutes. The Li3V2（PO4）3 were finally synthesized via carbothermal reduction process. The structure and morphology of Li3V2（PO4）3 powders were characterized by XRD and SEM. At charge-discharge cut-off voltages of 3 V-4.3 V and 3 V-4.8 V, the material shows rather high specific capacity, excellent cycling performance and rate capability. At charge-discharge cut-off voltages of 1.5 V-4.8 V, the material shows very high specific capacity but poor cycling performance. The Li3V2（PO4）3 cathode material is expected to be used in lithium ion batteries to partly replace the very expensive LiCoO2 cathode materials. This material is also promising to be used in power and storage lithium-ion batteries. To further improve the material＇s pile density and charge-discharge performance is considered as the researching direction.

关 键 词：锂离子电池 正极材料 LI3V2(PO4)3 微波碳热还原法 

分 类 号：TM910.4[电气工程—电力电子与电力传动]