Preparation of lithium vanadate by solution combustion synthesis and its electrochemical properties
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摘要: 以硝酸铵、偏钒酸铵、硝酸锂、葡萄糖、柠檬酸、甘氨酸为原料，采用溶液燃烧合成法成功制备了锂离子电池正极材料LiVO3粉末，探究了煅烧温度和煅烧时间对LiVO3制备的影响，并将制备得到的LiVO3粉末作为活性物质进行电池组装，进一步探究了其作为锂离子电池正极材料时的电化学性能。结果表明：400 ℃煅烧1 h时制备的LiVO3粉末具有最佳的电化学性能，0.1 A/g的充放电速率下，电池首次放电比容量为244.3 mAh/g，经过50次循环后放电比容量为193.6 mAh/g。Abstract: Using ammonium nitrate, ammonium metavanadate, lithium nitrate, glucose, citric acid and glycine as raw materials, LiVO3 powder as cathode material for lithium-ion battery was successfully prepared by solution combustion synthesis. The effects of calcination temperature and calcination time on the preparation of LiVO3 were investigated. The as-prepared LiVO3 powder was used as active material for battery assembly, and its electrochemical performance as cathode material for lithium-ion battery was further explored. The results show that the LiVO3 powder prepared at 400 ℃ for 1 h has the best electrochemical performance. At the charge discharge rate of 0.1 A/g, the first discharge specific capacity of the battery is 244.3 mAh/g, and after 50 cycles, the discharge specific capacity retains 193.6 mAh/g.
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图 2 400 ℃煅烧前后的材料对比
Figure 2. Comparison of materials before and after calcination at 400 ℃
图 3 400 ℃不同时间煅烧后的产物物相分析
Figure 3. Phase analysis of products calcined at 400 ℃ for different time
图 5 300 ℃煅烧0.5 h和1 h的材料物相分析
Figure 5. Phase analysis of materials calcined at 300 ℃ for 0.5 h and 1 h
图 6 不同煅烧时间的循环性能
Figure 6. Cycle performance of as-prepared materials at 400 ℃ with different calcination time
图 7 不同倍率时的循环性能测试
Figure 7. Rate performance of the samples prepared at 400 ℃ for different time
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