焦磷酸钒锂的合成及其性能

The Synthesis and Properties of LiVP_2O_7

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.