A novel sol-gel method to synthesize nanocrystalline LiVPO(4)F and its electrochemical Li intercalation performances

作者：Li Yuzhan; Zhou Zhen^*; Gao X P; Yan Jie

来源：Journal of Power Sources, 2006, 160(1): 633-637.

DOI：10.1016/j.jpowsour.2006.01.067

• lithium-ion batteries
• cathode material
• sol-gel method
• LiVPO(4)F

Lithium vanadium fluorophosphate, LiVPO(4)F, a cathode material for lithium ion batteries, was synthesized by a sol-gel method followed by low temperature calcinations. V(2)O(5)(.)nH(2)O hydro-gel, NH(4)H(2)PO(4), LiF and carbon were used as starting materials to prepare a precursor, and LiVPO(4)F was finally obtained by sintering the precursor at 550 degrees C for 2 h. X-ray diffraction results show that the LiVPO(4)F sample is triclinic structure. TEM image indicates that the LiVPO(4)F particles are about 70 nm in diameter embedded in carbon network. The LiVPO(4)F system showed the discharge capacity of about 130 mAh g(-1) in the range of 3.0-.6 V at the first cycle, and the discharge capacity remained about 124 mAh g(-1) after 30 cycles. The sol-gel method is suitable for the preparation of LiVPO(4)F cathode materials with good electrochemical Li intercalation performances.

• 出版日期2006-9-29
• 单位南开大学