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以三维网络结构的科琴黑(KB)为模板和导电骨架,采用湿浸渍法合成了六方结构的LiMnBO_3/C复合材料。用X射线衍射、扫描电镜和氮吸附等测试技术分别对样品的微观结构、形貌和比表面积进行了表征。用恒流充放电和循环伏安对复合材料的电化学性能进行了研究。当LiMnBO_3/C复合材料以C/20倍率进行锂离子脱嵌性能测试时,30周循环后放电容量保持率为87.4%,表现出优良的循环稳定性。当电流从C/20、C/10增至C/5时,复合材料的首次放电比容量依次为138.8、124.5和100.5 m Ah·g~(-1),表明复合材料具有良好的倍率性能。
A hexagonal LiMnBO_3 / C composite was synthesized by wet impregnation method using Ketjenblack (KB) with three-dimensional network structure as the template and conductive framework. The microstructure, morphology and specific surface area of the samples were characterized by X-ray diffraction, scanning electron microscopy and nitrogen adsorption. The electrochemical properties of the composites were investigated by constant current charge-discharge and cyclic voltammetry. When the LiMnBO_3 / C composites were tested for their lithium ion deintercalation performance at a C / 20 ratio, the discharge capacity retention after 30 cycles was 87.4%, showing excellent cycling stability. When the current is increased from C / 20 and C / 10 to C / 5, the initial discharge capacities of the composites are 138.8, 124.5 and 100.5 m Ah · g -1, respectively, indicating that the composites have good rate capability.