【摘要】 以CuO为铜源,葡萄糖为碳源采用原位还原固相法合成LiFePO₄/（C+Cu）材料。采用XRD、SEM、EDS、LAND电池测试系统及电化学工作站等对材料的晶体结构、形貌和电化学性能进行测试,重点分析了材料的低温特性。结果表明:添加10%的葡萄糖合成的LiFePO₄/（C+Cu）展示出较好的电化学性能,尤其是低温性能。25℃,0.1C下首次放电比容量高达151.1 m Ah/g,-20℃时0.1C首次放电比容量107.6 mAh/g,为25℃相应倍率放电比容量的71.2%。更多还原

【Abstract】 Cu-C co-coated on the surface of LiFePO₄（LiFePO₄/（C+Cu）） cathode materials were prepared through in-situ solid state reduction reaction. The optimized additive amount of carbon was determined by electrochemical test of series content-dependent samples. Crystalline structure, morphology and electrochemical performance of the samples were characterized by X-ray diffraction, SEM, EDS, charge-discharge tests and AC impedance techniques.Low-temperature performances of the synthesized material were discussed. Results show that the LiFePO₄/（C+Cu）cathode material shows improved electrochemical performance especially at low temperature with 10% glucose additive. At 25 ℃ and 0.1C, specific capacity of the Cu-C co-coated sample reaches 151.1 m Ah/g. At-20 ℃, the discharge capacity of Cu-coated materials is 107.6 m Ah/g at 0.1C, which reaches about 71.2% of that at room temperature.更多还原