ＬｉＦｅＢＯ３／ＬＢＯ复合材料的制备及其电化学性能

采用溶胶-凝胶法制备了单斜结构的LiFeBO3/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LiFeBO3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194.6 mAh/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 mAh/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LiFeBO3粒子之间的导电性明显得到改善.

Synthesis and electrochemical performance of LiFeBO3/LBO composite materials

LiFeBO3/lithium boron oxide (LBO) composites with single monoclinic phase (C2/c space group) were synthesized by sol-gel method. Structure and morphology of the samples were analyzed by X-ray diffraction and scanning electron microscopy, respectively. The electrochemical characteristics of samples were evaluated by means of the constant current charge-discharge, cyclic voltammetry (CV) and alternating current (AC) impedance. It is demonstrated that composites with LBO show higher discharge specific capacities and better cycling performance than bare LiFeBO3, especially the sample with 15.1% LBO, which delivers an initial discharge specific capacity of 194.6 mAh/g and a discharge specific capacity of 137.0 mAh/g at the 100th cycle with a rate of C/20, respectively. The observation of CV and AC impedance also indicates that the composite with 15.1% LBO evidently increases the conductivity between LiFeBO3 particles.