湿浸渍法合成LiMnBO3/C复合材料及其电化学性能改善

Improved Electrochemical performance of LiMnBO3/C composite synthesized by wet impregnating method

摘要:

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LiMnBO3/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表征。当LiMnBO3/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100.5mA h g-1，表明复合材料具有良好的倍率性能。

Abstract:

Hexagonal-LiMnBO3/C composite was prepared by the wet impregnating method using the 3D-network ketchen black (KB) as both temple and conductive framework. The crystal structure, morphology and specific surface area were characterized by X-ray diffraction, scanning electron microscopy and nitrogen sorption measurements, respectively. The electrochemical properties of the composite were studied by galvanostatic charge/discharge and cyclic voltammetry measurements. When tested at C/20 rate for Li ion insertion/extraction properties, LiMnBO3/C composite exhibits good cycle capability with discharge capacity retention of 87.4% at the 30th cycle. As the current rate increases from C/20, C/10 to C/5, good rate capability was obtained for all rates with initial discharge specific capacities of 138.8, 124.5 and 100.5 mA h g-1, respectively.