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采用溶胶-凝胶法制备了单斜结构的Li Fe BO3/LBO复合材料(C2/c空间群).通过XRD,SEM,充放电测试、循环伏安、交流阻抗等手段分别对结构、形貌和电化学性能进行了研究.结果表明,与不含LBO的Li Fe BO3相比,复合材料具有较高的放电比容量和良好的循环性能,尤其是当复合材料中含有15.1%LBO时,该材料在C/20倍率下获得了194.6m Ah/g的首次放电比容量,100次循环后放电比容量仍维持在137.0 m Ah/g.循环伏安和交流阻抗测试结果也表明,LBO含量为15.1%的复合材料中Li Fe BO3粒子之间的导电性明显得到改善.
The monoclinic LiFeB03 / LBO composites (C2 / c space group) were prepared by sol-gel method. The structure, morphology and morphology of LiFeB03 / LBO composites were investigated by XRD, SEM, charge and discharge test, cyclic voltammetry The results show that the composite has higher specific discharge capacity and better cycling performance than LiBO3 without LBO, especially when the composites contain 15.1% LBO The initial discharge capacity of 194.6m Ah / g was obtained at C / 20 ratio, and the specific discharge capacity remained at 137.0 m Ah / g after 100 cycles.The cyclic voltammetry and AC impedance test also showed that the LBO content was The electrical conductivity between LiFeBO3 particles in 15.1% of the composites was significantly improved.