【摘要】 以葡萄糖为碳源,采用一种新的碳热还原法制备LiFePO4/C正极材料。采用X射线衍射(XRD)、扫描电镜(SEM)等对产物的结构和形貌进行了表征,同时通过循环伏安和交流阻抗等手段研究了LiFePO4/C电极中锂离子的脱嵌过程。结果表明,由循环伏安法计算得到的锂离子的平均扩散系数D0=1.20×10-12cm2·s-1;而交流阻抗测试表明,LiFePO4的电荷转移电阻(Rct)随电极电位变化,在电位平台附近有一个最小值。更多还原

【Abstract】 LiFePO4/C composite cathode materials were synthesized by a novel carbothermal reduction (CTR) method using glucose as carbon resource. The product characterization of the structure and morphology of the product were studied by XRD and SEM, respectively. The process of intercalation and removal of Li-ion were investigated by cyclic voltammetry and AC impedance method. The average diffusion coefficient of Li-ion (D0) is 1.20×10-12 cm2·s-1 and charge-transfer resistance (Rct) is dependant on potential and has a minimum value close to plateau.更多还原