聚丙烯酰胺凝胶法制备Bi2Mn4O10及其电化学性能  

Bi2Mn4O10:Preparation by Polyacrylamide Gel Method and Electrochemical Performance

作　　者：湛菁 徐昌藩 龙怡宇 李启厚 ZHAN Jing;XU Changfan;LONG Yiyu;LI Qihou(School of Metallurgy and Environment,Central South University,Changsha 410083,China;National Engineering Laboratory for High Efficiency Recovery of Refractory Nonferrous Metals Resources,Changsha 410083,China)

机构地区：[1]中南大学冶金与环境学院,长沙410083 [2]难冶有色金属资源高效利用国家工程实验室,长沙410083

出　　处：《无机材料学报》2020年第7期827-833,共7页Journal of Inorganic Materials

基　　金：国家自然科学基金重点项目(51974378);中南大学中央高校基本科研业务费专项资金(2019ZZTS502)。

摘　　要：Bi2Mn4O10具有高的理论比容量,被认为是一种理想的锂离子电池负极材料。本研究以硝酸铋和乙酸锰为原料,采用聚丙烯酰胺凝胶法制备Bi2Mn4O10负极材料,考察了制备条件对Bi2Mn4O10负极材料的物相、形貌及电化学性能的影响。结果表明:在丙烯酰胺含量与总金属离子摩尔比为8:1,葡萄糖浓度为1.11mol/L,热处理温度为873 K的条件下,可得类球型、分散性良好的纯相Bi2Mn4O10粉末。作为负极材料, Bi2Mn4O10粉末在0.2C (1C=800 mA/g)倍率下循环50圈后可保持496.8 mAh/g的比容量,容量保持率为76.9%;3C倍率下放电容量为232 mAh/g。Due to competitive theoretical capacity,Bi2Mn4O10 has been deemed as an efficient Li-ion battery anode material.Bi2Mn4O10 powder was prepared by polyacrylamide gel method using bismuth nitrate and manganese acetate as raw materials.The effects of preparation conditions on the phase,morphology and electrochemical cycling performance of powder were investigated.Results showed that the spheroid Bi2Mn4O10 powder with narrow size distribution was successfully prepared under the conditions of molar ratio of acrylamide to total metal ions of 8:1,the glucose concentrations of 1.11 mol/L and heat treatment temperature of 873 K.Lithium ion batteries with as-prepared Bi2Mn4O10 as anode material,acquired excellent cycle and rate performances.Its discharge specific capacity is 496.8 mAh/g at 0.2C(1C=800 mA/g)rate after 50 cycles,corresponding to a high capacity of 76.9%.Even at 3C rate,a superior rate capacity of 232 mAh/g is retained.

关 键 词：锂离子电池 负极材料 Bi2Mn4O10 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]