Li_3V_2(PO_4)_3/C复合材料及其电池性能研究  

Study on performance of Li_3V_2(PO_4)_3/C composite material for lithium-ion batteries

作　　者：任丽彬[1] 杨凯[1] 彭庆文[1] 卢志威[1] 刘兴江[1] 

机构地区：[1]中国电子科技集团公司第十八研究所化学与物理电源重点实验室,天津300384

出　　处：《电源技术》2012年第11期1603-1605,共3页Chinese Journal of Power Sources

基　　金：国家高技术研究发展计划资助项目(2011AA1A255)

摘　　要：采用喷雾干燥法合成了Li3V2(PO4)3/C复合正极材料,通过X射线衍射光谱法(XRD)、扫描电子显微镜法(SEM)和差示扫描量热法(DSC)对合成的复合材料进行了表征;以Li3V2(PO4)3/C复合材料为正极、CMS-G25为负极,制备18650锂离子电池,考察了该电池的倍率性能、循环性能和安全性能。结果表明:合成的Li3V2(PO4)3/C复合材料为单斜晶体结构,可以得到微米级的球形Li3V2(PO4)3/C二次颗粒;该复合材料具有优异的热稳定性,在4.3 V和4.7 V满电态下的放热量分别为240.1 J/g和259.4 J/g,明显低于其它几种正极材料。制备的18650锂离子电池具有良好的高倍率放电性能、循环性能,其15 C/1 C放电容量可达95%,100次容量保持率为95.02%;同时还具有优异的安全性能,顺利通过了挤压、针刺、短路、热箱等实验,电池均不爆炸、不起火。Li3V2（PO4）3/C composite cathode material was prepared by spray drying method.The characteristic of the Li3V2（PO4）3/C composite material was investigated by means of XRD,SEM and DSC.The 18650 lithium-ion batteries were prepared with Li3V2（PO4）3/C composite cathode material and CMS-G25 anodic material.The rate ability,cycling performance and safety characteristic of the LIB were studied.The results indicate that the Li3V2（PO4）3/C composite material is pure monoclinic phase,and the spherical secondary particles can be prepared by spray drying method.The samples have excellent thermal stability,the exotherm in the 4.3 V and 4.7 V charged state is 240.1 J/g and 259.4 J/g,respectively.The 18650 LIB shows good high-rate ability,cycling performance and safety characteristic.The discharge capacity of 15 C/1 C is 95%,the discharge capacity retention is 95.02% after 100 cycles.The punch,nail,short circuit and heat test were carried out;the 18650 LIB had no fire and no explosion.

关 键 词：磷酸钒锂 复合材料 锂离子电池 

分 类 号：TM912[电气工程—电力电子与电力传动]