聚丙烯酰胺凝胶法制备Bi2Mn4O10及其电化学性能

doi:10.15541/jim20190488

摘要/Abstract

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1.11 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。

关键词: 锂离子电池, 负极材料, Bi₂Mn₄O₁₀, 电化学性能

Abstract:

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.

Key words: lithium ion battery, anode material, Bi₂Mn₄O₁₀, electrochemical performance

中图分类号:

TM912

湛菁,徐昌藩,龙怡宇,李启厚. 聚丙烯酰胺凝胶法制备Bi₂Mn₄O₁₀及其电化学性能[J]. 无机材料学报, 2020, 35(7): 827-833.

ZHAN Jing,XU Changfan,LONG Yiyu,LI Qihou. Bi₂Mn₄O₁₀: Preparation by Polyacrylamide Gel Method and Electrochemical Performance[J]. Journal of Inorganic Materials, 2020, 35(7): 827-833.

图/表 6

图1 不同丙烯酰胺与总金属离子摩尔比下所得产物的SEM照片((a) 2 : 1, (b) 4 : 1, (c) 6 : 1, (d) 8 : 1), (e) XRD图谱, (f)作为负极材料在0.2C时的比容量循环性能以及摩尔比为8 : 1时产品的库伦效率曲线(0.1C活化3圈, 1C=800 mA/g)

Fig. 1 SEM images ((a) 2 : 1, (b) 4 : 1, (c) 6 : 1, (d)8 : 1), (e) XRD patterns and (f) cycling performance at 0.2C of the products obtained with different molar ratios of acrylamide to total metal ions, and Coulombic efficiency of the product with molar ratio of acrylamide to total metal ions of 8 : 1 (after 3 cycles at 0.1C, 1C=800 mA/g) Glucose concentrations: 1.11 mol/L, heat treatment temperature: 873 K, weight ratio of acrylamide to N,N’-methylene bisacrylamide: 5 : 1

图2 不同葡萄糖浓度下所得产物的SEM照片((a) 0.28 mol/L, (b) 0.56 mol/L, (c)0.83 mol/L, (d) 1.11 mol/L), (e) XRD图谱, (f) 作为负极材料在0.2C时的比容量循环性能以及葡萄糖浓度为1.11 mol/L时产品的库伦效率曲线(0.1C活化3圈, 1C=800 mA/g)

Fig. 2 SEM images ((a) 0.28 mol/L, (b) 0.56 mol/L, (c) 0.83 mol/L, (d) 1.11 mol/L), (e) XRD patterns and (f) cycling performance at 0.2C of the products obtained with different glucose concentrations, and Coulombic efficiency of the product with 1.11 mol/L glucose (after three cycles at 0.1C, 1C=800 mA/g) Molar ratio of acrylamide to total metal ions: 8 : 1; heat treatment temperature: 873 K; weight ratio of acrylamide to N,N’-methylene bisacrylamide of 5 : 1

图3 不同热处理温度下所得产物SEM照片((a) 873 K, (b) 923 K, (c) 973 K), (d) XRD图谱, (e)作为负极材料在0.2C时的比容量循环性能以及873 K时产品的库伦效率曲线(0.1C活化3圈, 1C=800 mA/g)

Fig. 3 SEM images ((a) 873 K, (b) 923 K, (c) 973 K), (d) XRD patterns and (e) cycling performance at 0.2C of the products obtained with different heat treatment temperatures, and Coulombic efficiency of the product with heat-treatment temperature of 873 K (after three cycles at 0.1C, 1C=800 mA/g) Molar ratio of acrylamide to total metal ions: 8 : 1, glucose concentrations of 1.11 mol/L, weight ratio of acrylamide to N,N’-methylene bisacrylamide: 5 : 1

图4 在优化工艺条件下制备的Bi2Mn4O10的(a)TEM和(b) HRTEM照片

Fig. 4 (a) TEM and (b) HRTEM images of Bi2Mn4O10 obtained at optimized conditions

图5 在优化工艺条件下制备的Bi2Mn4O10的(a)粒度分布柱状图和(b)氮气吸脱附曲线以及孔径分布图

Fig. 5 (a) Particle size distribution and (b) N2 adsorption and desorption curves of Bi2Mn4O10 obtained at optimized conditions with inset in (b) showing the pore size distribution curve

图6 优化工艺条件下制备的Bi2Mn4O10的(a)循环伏安曲线, (b)在0.1C时的电压-比容量曲线和(c)倍率性能图

Fig. 6 (a) CV curves, (b) voltage-specific capacity curves at 0.1C and (c) rate performance curve of Bi2Mn4O10 obtained at optimized conditions

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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

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