焦磷酸钒锂的合成及其性能  

The Synthesis and Properties of LiVP_2O_7

作　　者：徐土根[1] 周霄霄[1] 龚建杭[1] 王祎丽[1] 

机构地区：[1]杭州师范大学材料与化学化工学院,浙江杭州310036

出　　处：《杭州师范大学学报（自然科学版）》2012年第5期416-419,共4页Journal of Hangzhou Normal University(Natural Science Edition)

基　　金：杭州师范大学攀登工程项目(PD11002008002008)

摘　　要：用溶胶-凝胶法合成了焦磷酸钒锂(LiVP2O7)锂电池正极材料,XRD显示该材料属于单斜晶体结构(P21空间群),晶胞参数为a=4.804,b=8.113,c=6.939,β=109.01°,SEM测试表明该材料的粒径大约在500nm-1μm之间,分散性好.该材料首次放电容量达到91mAh.g-1,首次充放电库仑效率在93%以上,46周循环后,放电容量仍能保持在82mAh.g-1,显示出良好的循环稳定性和可逆性.The cathode material for lithium-ion battery with lithium vanadium pyrophosphate （LiVP2O7） was synthesized by the sol-gel method. XRD showed the material belonged to a monoclinic structure with lattice parameters a= 4. 804A, b= 8. 113A, c= 6. 939A, β= 109.01°（P21 space group）. SEM test showed that the particles of the material were evenly distributed with the sizes of 500nm-1μm. The first discharge capacity of the material reached 91mAh·g-1 and the first columbic efficiency was over 93%. After 46 cycles, the discharge capacity still remained over 82mAh·g-1, which indicated the good cycle capability and reversibility.

关 键 词：焦磷酸钒 锂电池 合成 循环稳定性 正极材料 性能 溶胶-凝胶法 放电容量 

分 类 号：O6[理学—化学]