二氧化钼-碳复合涂层的电化学性能研究

doi:10.13208/j.electrochem.170409

摘要/Abstract

摘要：

应用简单的刮涂法以及真空煅烧可制备出承载在铜箔表面的二氧化钼-碳（MoO₂-C）复合涂层，并对样品的形貌、成分、结构和电化学性能进行分析.结果表明，该复合涂层由单斜结构的MoO₂纳米粒子和无定形碳组成.一些MoO₂纳米粒子承载在碳基体表面，其尺寸为5~30nm；一些MoO₂纳米粒子包覆在碳基体内部，其尺寸约为5nm. MoO₂-C复合涂层为多孔结构，其孔隙尺寸为1~3nm.该复合涂层与铜箔结合紧密，界面处没有裂纹.承载在铜箔表面的MoO₂-C复合涂层的比容量高、循环和倍率性能良好.在100mA·g^-1电流密度下，该负极经过100次循环后的比容量为814mAh·g^-1，在循环过程中没有出现明显的容量衰减，即使在5000mA·g^-1的高电流密度下，其比容量仍有188mAh·g^-1.

关键词: 二氧化钼, 碳基复合材料, 涂层, 负极材料, 电化学性能

Abstract:

The molybdenum dioxide-carbon(MoO₂-C)composite coatings on the surface of Cu foils were prepared by simple knife coating route and followed by sintering in vacuum. The morphology, composition, structure and electrochemical performance of the MoO₂-C composite coatings were investigated. The results demonstrated that the MoO₂-C composite coatings consist of MoO₂ nano-particles with monoclinic crystal structure and amorphous carbon. Some MoO₂ nano-particles with a size range of 5-30nm were loaded on the surface of carbon matrices; while some MoO₂nano-particles with a size of ~5nm were encapsulated inside. The composite coatings showed porous structure with the pore size ranging 1~3nm. The composite coatings attached firmly on the surface of Cu foils without any cracks accurred at their interface. The Cu-supported MoO₂-C composite coatings delivered high capacity and good cyclic performance with a capacity of 814 mAh·g^-1 at a current density of 100mA·g^-1 after 100 cycles without apparent capacity fading during cycling, and good rate performance with a capacity of 188mAh·g^-1 even at a high current density of 5000mA·g^-1.

Key words: molybdenum dioxide, carbon based composite, coating, anode materials, electrochemical performance

中图分类号:

O646
TM911

李全一，杨琪，赵艳红. 二氧化钼-碳复合涂层的电化学性能研究[J]. 电化学（中英文）, 2018, 24(2): 160-165.

LI Quan-yi, YANG Qi, ZHAO Yan-hong. Electrochemical Performance of MoO₂-C Composite Coatings[J]. Journal of Electrochemistry, 2018, 24(2): 160-165.

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