湿浸渍法合成LiMnBO_3/C复合材料及其电化学性能（英文）

Electrochemical Performance of LiMnBO_3/C Composite Synthesized by Wet Impregnating Method

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。

Hexagonal-Li Mn BO_3/C composite was prepared by a wet impregnating method using the 3D-network ketchen black（KB）as both a temple and a 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. Results show that when tested at C/20 rate for Li ion insertion/extraction properties, Li Mn BO_3/C composite exhibits good cycle capability with discharge capacity retention of 87.4% at the 30 th cycle. As the current rate increases from C/20, C/10 to C/5, good rate capability is obtained for all rates with initial discharge specific capacities of 138.8, 124.5 and 100.5 m Ah·g（-1）, respectively.