Ag-TiO2-MnO2复合材料的制备与电化学性能研究

doi:10.13208/j.electrochem.171130

电化学（中英文） ›› 2018, Vol. 24 ›› Issue (3): 292-299. doi: 10.13208/j.electrochem.171130

Ag-TiO₂-MnO₂复合材料的制备与电化学性能研究

张伶潇，赵惠慧，张丽娟^* ，付予

北京工业大学环境与能源工程学院化学与化工系绿色催化与分离重点实验室，北京 100124

收稿日期:2017-11-30 修回日期:2018-01-09 出版日期:2018-06-28 发布日期:2018-03-12
通讯作者: 张丽娟 E-mail:zhanglj1997@bjut.edu.cn
基金资助:
北京市属高校高水平教师队伍建设支持计划（No. IDHT20180504）及17内涵发展-课程和教材建设-优质教学资源立项（No. 310000514117026）资助

Preparation and Electrochemical Performance of Ag-TiO₂-MnO₂Composites

ZHANG Ling-xiao, ZHAO Hui-hui, ZHANG Li-juan^*, FU Yu

Beijing Key Laboratory for Green Catalysis and Separation, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China

Received:2017-11-30 Revised:2018-01-09 Published:2018-06-28 Online:2018-03-12
Contact: ZHANG Li-juan E-mail:zhanglj1997@bjut.edu.cn

摘要/Abstract

摘要：

采用高温固相法制备了Ag-TiO₂共修饰的二氧化锰锂电池阴极材料，通过X射线衍射仪（XRD）、扫描电子显微镜（SEM）、傅立叶红外光谱仪（FT-IR）、X射线光电子能谱仪（XPS）、能量散射X射线能谱（EDS）、循环伏安测试（CV）、恒流放电测试、交流阻抗测试（EIS）等分别检测了所制备样品的物理-化学特性及相应的电化学性能特征.结果表明：空白二氧化锰与修饰后二氧化锰均为β 晶型，相比于未修饰样品，Ag-TiO₂-MnO₂样品的形貌得到了明显的改变.修饰后样品大倍率的放电比容量显著提升，1C 下的容量由 75mAh·g^-1增加到 115mAh·g^-1，Ag-TiO₂-MnO₂样品 Mn-O 键能的增强对于抑制放电过程中体积膨胀也有一定作用，可以使二氧化锰材料保持较好的结构稳定性.

关键词: 二氧化锰阴极材料, Ag-TiO₂, 修饰, 电化学性能

Abstract:

The silver-titanium dioxide co-modified manganese dioxide (Ag-TiO₂-MnO₂) cathode material was prepared through high temperature solid state reaction. The microstructure, phase composition and electrochemical performance of the prepared samples were characterized by X-ray diffraction spectroscopy (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectrometry (FT-IR), X-ray photoelectron spectroscopy (XPS), Energy-dispersive X-ray spectroscopy (EDS), Cyclic voltammetry (CV), galvanostatic discharge and electrochemical impedance spectroscopy (EIS). Results showed that the unmodified and Ag-TiO₂ modified MnO₂ samples both exhibited β-MnO₂ structurebut with different morphologies. The EDS mapping results revealed that Ag was uniformly dispersed on the surface of manganese dioxide, while Ti was relatively non-uniform in the Ag-TiO₂-MnO₂ sample. The modified samples were effective in improving specific discharge capacities. The specific discharge capacity increased from 75 mAh·g^-1 to 115 mAh·g^-1 at the rate of 1C. The stronger bond energy of Mn-O in the modified MnO₂ could suppress the volume expansion during the discharge process, which can maintain the structural stability of the manganese dioxide material.

Key words:

line-height: 150%">mso-bidi-font-size: 10.5pt">Manganese dioxide cathode material, Ag-TiO₂, modification, electrochemical performance

中图分类号:

O646

张伶潇，赵惠慧，张丽娟，付予. Ag-TiO₂-MnO₂复合材料的制备与电化学性能研究[J]. 电化学（中英文）, 2018, 24(3): 292-299.

ZHANG Ling-xiao, ZHAO Hui-hui, ZHANG Li-juan, FU Yu. Preparation and Electrochemical Performance of Ag-TiO₂-MnO₂Composites[J]. Journal of Electrochemistry, 2018, 24(3): 292-299.

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链接本文: https://electrochem.xmu.edu.cn/CN/10.13208/j.electrochem.171130

https://electrochem.xmu.edu.cn/CN/Y2018/V24/I3/292

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Ag-TiO₂-MnO₂复合材料的制备与电化学性能研究

Preparation and Electrochemical Performance of Ag-TiO₂-MnO₂Composites

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