Synergetic Effects of Al3+ Doping and Graphene Modification on the Electrochemical Performance of V2O5 Cathode Materials
Synergetic Effects of Al3+ Doping and Graphene Modification on the Electrochemical Performance of V2O5 Cathode Materials
复制标题
Al3掺杂和石墨烯改性对V2O5正极材料电化学性能的协同影响
DOI：
10.1002/cssc.201500027
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发表时间：
2015
期刊：
影响因子：
8.4
通讯作者：
Zhu K
中科院分区：
文献类型：
--
作者：
Zhu Kai;Qiu Hailong;Zhang Yongquan;Zhang Dong;Chen Gang;Wei Yingjin;Chen Gang;Zhu K
采用简单的软化学方法制备了一系列V2 O 5基正极材料，包括V2 O 5和Al 0. 14 V2 O 5纳米颗粒、V2 O 5/还原氧化石墨烯（RGO）以及Al 0. 16 V2 O 5/RGO纳米复合材料。XRD和拉曼散射表明Al离子主要存在于材料的层间空间。这些掺杂离子加强了[VO 5]单元的V-O键，并增强了[VO 5]层之间的连接，从而提高了V2 O 5的结构稳定性。SEM和TEM图像表明，V2 O 5纳米粒子与RGO构成了一种杂化结构，使电子在电极基体中快速传输。通过充放电循环、循环伏安、交流阻抗等测试手段研究了材料的电化学性能。在所有测试的材料中，含有Al离子和RGO的材料（Al 0.16V2O5/RGO）表现出最高的放电容量、最好的倍率性能和优异的容量保持率。其上级电化学性能的提高是由于Al 3+掺杂和RGO改性的协同作用，不仅提高了V2 O 5晶格的结构稳定性，而且改善了材料的电化学动力学性能。
A series of V2O5‐based cathode materials that include V2O5and Al0.14V2O5nanoparticles, V2O5/reduced graphene oxide (RGO), and Al0.16V2O5/RGO nanocomposites are prepared by a simple soft chemical method. XRD and Raman scattering show that the Al ions reside in the interlayer space of the materials. These doping ions strengthen the VO bonds of the [VO5] unit and enhance the linkage of the [VO5] layers, which thus increases the structural stability of V2O5. SEM and TEM images show that the V2O5nanoparticles construct a hybrid structure with RGO that enables fast electron transport in the electrode matrix. The electrochemical properties of the materials are studied by charge–discharge cycling, cyclic voltammetry, and electrochemical impedance spectroscopy. Of all the materials tested, the one that contained both Al ions and RGO (Al0.16V2O5/RGO) exhibited the highest discharge capacity, the best rate capability, and excellent capacity retention. The superior electrochemical performance is attributed to the synergetic effects of Al3+doping and RGO modification, which not only increase the structural stability of the V2O5lattice but also improve the electrochemical kinetics of the material.