摘要
采用溶胶-凝胶法制备锂离子电池正极材料LiV3O8,研究了LiOH溶液的浓度对LiV3O8的结构、粒径、电导率和电化学性能的影响。实验发现,LiV3O8衍射峰的强度、粒径与电导率可以通过改变LiOH溶液浓度来控制。测试了LiV3O8材料的结构、粒径分布和电化学性能。结果表明,随着LiOH溶液浓度的增加,样品的结晶度降低,晶粒的择优取向(100)晶面的衍射峰强度明显减弱;当LiOH溶液浓度为0.030 mol/L时,可以得到较为理想的粒径分布和较高的电导率为9.06×10-2s/cm;LiV3O8材料的容量及循环性能均与LiOH溶液浓度有关,选择0.030 mol/L的LiOH溶液时,样品的比容量最大为310 mA.h/g;循环15次后,容量衰减最少为4%。
LiV3O8 as cathode material for lithium batteries was prepared via sol-gel method. Effects of the concentration of LiOH solution on the particle size, the structure, the electrical conductivity and the electrochemical performance of LiV3O8 were studied. It was found that the intensity of X-ray diffraction peaks, the particle size and the electrical conductivity of LiV3O8 can be controlled by changing the concentration of the LiOH solution. The paticle size distribution and the structure of LiV3O8 and the electrochemical performance were measured. The results show that the crystallization degree and the intensity of peak （100） decreased with the increase of the LiOH concentration. An ideal particle size distribution and a high electrical conductivity value（9.06 × 10^-2 s/cm） was obtained at a concentration of 0. 030 mol/L. The capacity and the cycle performance of LiV3O8 were found to depend on the concentration of the LiOH solution. The specific capacity was 310 mA · h/g and the cycle performance decreased by 4% after 15 cycles at a LiOH concentration of 0. 030 mol/L.
出处
《应用化学》
CAS
CSCD
北大核心
2007年第4期425-428,共4页
Chinese Journal of Applied Chemistry
基金
安徽省教育厅自然科学基金资助项目(050601D2)
关键词
锂电池
LIV3O8
结构
粒径
电化学性能
LiOH浓度
lithium battery
LiV3O8
structure
particle size
electrochemical-performance
concentration of LiOH solution
