黄麻基碳纤维/MnO/C锂离子电池负极材料的制备及其电化学性能  

Preparation and Electrochemical Performance of Carbon Fiber/MnO/C Composites as Anodes for Lithium Batteries

作　　者：周步宇 张春艳[2] 吴长昊[1] 刘涵[1] 于静[1] 杨淳[1] 沈玉华[1] 

机构地区：[1]安徽大学化学化工学院,清洁能源与绿色催化创新实验室,合肥230601 [2]安徽农业大学理学院应用化学系,合肥230036

出　　处：《无机化学学报》2016年第5期811-817,共7页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21173001,21371003)资助项目

摘　　要：利用黄麻碳化后的纤维和吡咯单体作为还原剂,高锰酸钾作为氧化剂,通过原位氧化还原反应法合成了碳纤维/MnO/C一维复合物。扫描电子显微镜(SEM)结果显示,MnO/C纳米颗粒分布在碳纤维的外壁上,MnO被包裹在由聚吡咯碳化而来的碳中,MnO/C纳米颗粒大小为50~150 nm。将制备的产物作为锂离子电池负极材料进行充放电测试,结果表明当电流密度为100mA·g^(-1)时,循环50次后仍具有410 mAh·g^(-1)的比容量,同时也展现了良好的倍率性能。Natural jute was simply treated by a controllable hydrothermal process performed in alkaline solutions, wherein abundant natural cellulose fibers in jute in situ get separated and dispersed spontaneously. After carbonization, cellulose fibers were transformed to hollow carbon fibers with roughness surface. Potassium permanganate was employed as the oxidant for pyrrole in the presence of carbon fibers. The carbon fiber/MnO/C was first prepared by solvothermal method followed by calcination in nitrogen and MnO/C distribution on the surface of carbon fiber. The MnO nanoparticles with the size of 50-150 nm were wrapped in the carbon which came from the polypyrrole. A high reversible capacity of about 400 mAh· g^-1 is maintained without obvious decay up to 50 cycles at the current density of 100 mA·g^-1. Meanwhile, the composite also exhibits well rate performance.

关 键 词：一维复合物 负极材料 碳纤维 锂离子电池 

分 类 号：O614.711[理学—无机化学]