聚丙烯酰胺凝胶法制备Bi2Mn4O10及其电化学性能

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1.11 mol/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。

Bi2Mn4O10: Preparation by Polyacrylamide Gel Method and Electrochemical Performance

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.