Synthesis and electrochemical performance of Ag-doped VO2(B) as cathode materials

doi:10.11949/j.issn.0438-1157.20170812

Abstract

Abstract:

Ag-doped VO₂(B) cathode material was fabricated by hydrothermal reaction. Vanadium pentoxide (V₂O₅₎, maltose (C₁₂H₂₂O₁₁) and silver nitrate (AgNO₃) were used as starting materials. The physical properties of samples were characterized by X-ray diffraction, XPS, FESEM and EDS. Meanwhile, the electrochemical performance of material were observed with means of galvanostatic charge-discharge, cyclic voltammetry(CV) and electrochemical impedance spectroscopy (EIS). The results showed that the specific discharge capacity of the sample of Ag₁[0.43%(atom)] was 340.5 mA·h·g^-1 at 0.1C rate over the voltage range of 1.5-4.0 V, which was increased by 80.5% than the pure sample. The sample of Ag₃[1.28%(atom)] exhibited the optimal electrochemical performance. The initial discharge capacity maintained 213.6 mA·h·g^-1 after 100 cycles. The retention rate of capacity was 58.3%.

Key words: lithium ion battery, electrochemical performance, cathode material, VO₂(B), silver doping, hydrothermal method

摘要：

以V₂O₅、C₁₂H₂₂O₁₁和AgNO₃为原料，采用水热法制备Ag掺杂VO₂（B）正极材料，通过XRD、FESEM、XPS、EDS、循环伏安（CV）、交流阻抗（EIS）等表征手段，研究掺Ag对VO₂（B）的结构、形貌及电化学性能的变化规律。结果表明，当掺杂量为0.43%（atom）时，样品（Ag₁）首次放电比容量为340.5 mA·h·g^-1，较未掺杂样品（Ag₀）提高了80.5%。当掺杂量为1.28%（atom）时，样品（Ag₃）表现出最好的循环稳定性，首次放电容量为213.6 mA·h·g^-1，100次循环后，容量保持率为58.3%。

关键词: 锂离子电池, 电化学性能, 正极材料, VO₂(B), 银掺杂, 水热法

CLC Number:

TQ028.8

HAN Shichang, ZOU Zhengguang, LÜ Tingting, WU Xingyu, YANG Qian. Synthesis and electrochemical performance of Ag-doped VO₂(B) as cathode materials[J]. CIESC Journal, 2018, 69(4): 1741-1748.

韩世昌, 邹正光, 吕婷婷, 吴星宇, 杨倩. Ag掺杂VO₂(B)正极材料的合成及其电化学性能[J]. 化工学报, 2018, 69(4): 1741-1748.

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Synthesis and electrochemical performance of Ag-doped VO₂(B) as cathode materials

Ag掺杂VO₂(B)正极材料的合成及其电化学性能

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