Hollow sphere structured V2O3@C as an anode material for high capacity potassium-ion batteries,Journal of Materials Chemistry A

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Hollow sphere structured V2O3@C as an anode material for high capacity potassium-ion batteries
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-06-13 , DOI: 10.1039/d0ta01057j
Fei Chen _{1,

2,

3,

4,

5} , Shuo Wang _{1,

2,

3,

4,

5} , Xiao-Dong He _{1,

2,

3,

4,

5} , Jia-Ying Liao _{1,

2,

3,

4,

5} , Qiao Hu _{1,

2,

3,

4,

5} , Jie-Min Dong _{1,

2,

3,

4,

5} , Chun-Hua Chen _{1,

2,

3,

4,

5}

Affiliation

Vanadium oxides with various compositions have been reported as electrodes for potassium-ion batteries, but the poor conductivity is the main obstacle to fulfilling the energy storage requirements. In this study, we synthesize carbon-coated V₂O₃ hollow spheres (HS-V₂O₃@C) by a facile solvothermal reaction. The HS-V₂O₃@C electrode exhibits promising cycling stability and rate performances. It retains a high reversible capacity of 330 mA h g⁻¹ at 100 mA g⁻¹ after 500 cycles. Its capacity reaches 79 mA h g⁻¹ at a high current density of 5000 mA g⁻¹. The superior performances are mainly due to the homogeneous carbon coating layer that greatly improves the electronic conductivity and the hollow structure that buffers the volume change during cycling. By means of ex situ X-ray diffraction and cyclic voltammetry, the mechanism of potassium ion storage in this HS-V₂O₃@C electrode is determined as the combination of intercalation and pseudocapacitive effects.

中文翻译：

中空球形结构的V2O3 @ C作为高容量钾离子电池的负极材料

已经报道了具有各种组成的氧化钒作为钾离子电池的电极，但是导电性差是满足储能要求的主要障碍。在这项研究中，我们通过容易的溶剂热反应合成了碳包覆的V ₂ O ₃空心球（HS-V ₂ O ₃ @C）。HS-V ₂ O ₃ @C电极具有良好的循环稳定性和倍率性能。500个循环后，在100 mA g ^-1时，它保持330 mA hg ^-1的高可逆容量。其容量达到79毫安汞柱^-1处的5000毫安g的高电流密度^-1。优异的性能主要归因于均质的碳涂层，该涂层大大提高了电子导电性，并且空心结构缓冲了循环过程中的体积变化。通过异位X射线衍射和循环伏安法，确定了该HS-V ₂ O ₃ @C电极中钾离子的存储机理是嵌入和拟电容效应的结合。

更新日期：2020-07-07

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