摘要
采用高温固相法合成LiFePO4/C材料,采用XRD和SEM对该材料性能进行表征。结果表明:采用不同原料合成的LiFePO4/C材料都具有规整的橄榄石型结构。原料对比实验表明,葡萄糖为碳源优于碳黑,草酸亚铁优于三价铁源;以葡萄糖为碳源、草酸亚铁为铁源合成的材料形貌规则,分散性好。电化学测试表明,以葡萄糖为碳源、草酸亚铁为铁源得到的LiFePO4/C材料0.1C时首次放电比容量达到152.2mA·h/g,大电流密度下性能良好,3C时其首次放电比容量为140.8mA·h/g,20次循环后仅衰减1.2%。
LiFePO4/C was synthesized by solid-state reaction. The materials were characterized by XRD and SEM. The results indicate that the performance of the dextrose as carbon source is better than that of carbon black, and the performance of ferrous oxalate as iron source is better than that of ferrate. The materials synthesized with carbon sources and iron source have a standard structure of olive-type phase, and the materials synthesized with dextrose and ferrous oxalate show the regular appearance and good performance of mixture. The material synthesized with the dextrose and ferrous oxalate shows the best electrochemical performance. The initial discharge capacity of this sample reaches 152.2 mA.h/g under the rate of 0.1 C, and reaches 140.8 mA.h/g under 3C rate and has a decrease of only 1.2% after 20 cycles.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2008年第3期541-545,共5页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金重点资助项目(50434010)
新世纪优秀人才基金资助项目(NCET-05-0692)
作者简介
通讯作者：赵中伟，教授，博士生导师；电话：0731-8830476；E-mail：zhaozw@mail．csu．edu．cn
