以LiOH、FeSO4和H3 PO4为原料,采用水热法合成了结晶性良好的LiFePO4颗粒.在此基础上,以葡萄糖为碳源,掺入不同量的碳,形成LiFePO4/C复合材料.样品经过XRD、SEM、恒流充放电测试、EIS表征,结果表明,掺碳提高了LiFePO4的比容量、循环性能和锂离子的扩散动力学性能.电化学测试表明,LiFePO4/C放电比容量开始随着碳含量的增加而上升,随后降低.其中,3％碳含量的LiFePO4/C样品具有最佳的放电性能,0.1C倍率下达到145mAh/g,0.2C倍率下达到142mAh/g,50次循环后仅衰减0.7％.
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