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采用表面活性剂为模板,通过分子自组装法合成了孔状纳米级锂离子正极材料LiFePO_4。并结合XRD、SEM、N_2吸附/脱附和充放电测试等手段,对合成材料的结构、形貌、孔的分布和电化学性能进行了分析。实验结果表明:表面活性剂为模板,通过高温烧结脱去可以形成纳米孔状的LiFePO_4正极材料,在以0.1mA的电流下放电,首次放电比容量有125.5mA·h/g,循环20次后其比容量仍有120mA·h/g,保持率达95.6%。
The surfactant was used as template to synthesize LiFePO_4, a porous nanocrystalline Li-ion cathode material by molecular self-assembly method. The structure, morphology, pore distribution and electrochemical properties of the composites were analyzed by XRD, SEM, N 2 adsorption / desorption and charge and discharge tests. The experimental results show that the surfactant can be used as template to form nanoporous LiFePO 4 cathode material by sintering at high temperature. After being discharged at a current of 0.1 mA, the initial discharge specific capacity is 125.5 mA · h / g. After 20 cycles The specific capacity is still 120mA · h / g, retention rate of 95.6%.