LiMnBO_3/C正极材料的合成及电化学性能的研究  

Synthesis and electrochemical performance of cathode material Li MnBO_3/C

作　　者：李琳[1,2] 郑浩[1,2] 程劲松[1] 冯传启[1,2] 王石泉[2] 

机构地区：[1]安顺学院功能材料与资源化学重点实验室,贵州安顺561000 [2]湖北大学有机功能分子合成与应用教育部重点实验室,湖北武汉430062

出　　处：《电源技术》2015年第2期249-251,334,共4页Chinese Journal of Power Sources

基　　金：贵州省科技厅;安顺市人民政府;安顺学院联合基金项目(黔科合J字LKA[2012]02号);贵州省教育厅重点项目(黔教合KY字[2013]176);湖北省科技厅国际合作与交流项目(2001BFA002)

摘　　要：采用流变相法方法,以LiOH·2 H2O、MnAc2·4 H2O和H3BO3为原料,柠檬酸为碳源,成功地合成了LiMnBO3材料和碳包覆的LiMnBO3/C复合材料。用XRD、TG、SEM等技术对材料的结构和形貌进行表征,并对其电化学性能进行了测试,结果表明：在电压范围为1.0-4.6 V,电流密度为10 mA/g的充放电条件下,LiMnBO3/C的首次放电比容量达到了149 mAh/g,而未包覆碳的LiMnBO3的首次放电比容量只有63 mAh/g。LiMnBO3/C与LiMnBO3相比,其电化学性能有了明显的改善,具有较高的可逆比容量和优良的循环性能。并对LiMnBO3/C表现优良的电化学性能的原因进行了初步的探讨。LiMnBO3 and its carbon-coated composites（LiMnBO3/C） were prepared by a rheological phase reaction method, using Li OH·2 H2 O, Mn Ac2·4 H2 O, and H3BO3 as reactants. Citric acid was used as carbon source during synthesis process. The structure and morphology of samples were characterized by X-ray diffraction（XRD）,thermogravimetric analysis（TGA）, scanning electron microscopy（SEM） techniques. The initial specific capacity of the LiMnBO3/C electrode was 149 m Ah/g in a volatage of 0.01-4.6 V versus Li/Li＋, but the initial specific capacity of the LiMnBO3 electrode was just 63 m Ah/g. The electrochemical tests show that the carbon-coated LiMnBO3 can greatly improve the discharge capacity, rate capability and cycling stability. The reasons for LiMnBO3/C to behave good electrochemical performances were also discussed.

关 键 词：锂离子电池 正极材料 LiMnBO3 碳包覆 流变相反应法 

分 类 号：TM912.9[电气工程—电力电子与电力传动]