LiCoVO_4新型陶瓷材料的Chimie Douce法合成及其价键振动研究

STUDY ON CHIMIE-DOUCE-METHOD SYNTHESIS AND VIBRATION MODES OF NOVEL CERAMIC MATERIAL LiCoVO_4

通过改进的ChimieDouce法制备出高电压阴极材料LiCoVO4 ,XRD测试表明高结晶单相LiCoVO4 在 45 0℃形成。LiCoVO4 位于82 0cm- 1 处的红外吸收带和拉曼吸收带分别归属于VO4 四面体具有A1 对称的伸缩振动和VO4 四面体中V -O键振动的内模振动峰 ,而 3 3 5cm- 1 处的红外和拉曼吸收带则对应于VO4 四面体具有E对称的变角振动。

A modified Chimie Douce method was introduced for preparing inverse spinel LiCoVO 4 as novel high-voltage cathode material for Li-ion batteries.Investigations were coducted by XRD,IR,Laman and electrochemical techniques.The results of XRD show the high crystalline LiCoVO 4 with high phase purity are formed at 450℃.The results of the IR and Laman investigations show that the band located at ～820cm -1 corresponding to the stretching vibration mode with the A 1 symmetry,whereas the band situated at ～335cm -1 corresponds to the bending mode of VO 4 tetrahedron with E symmetry.