Preparation and sodium storage performance of V2O5·nH2O/graphene composites
Preparation and sodium storage performance of V2O5·nH2O/graphene composites
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V2O5·nH2O/石墨烯复合材料的制备及储钠性能
DOI：
10.1007/s11581-019-03140-z
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发表时间：
2019-06
期刊：
影响因子：
2.8
通讯作者：
Li Yanwei
中科院分区：
文献类型：
--
作者：
Yao Jinhuan;Sun Tao;Ji Jingcheng;Sun Yinlu;Xiao Shunhua;Li Yanwei
采用溶胶-凝胶法制备了V2 O 5·nH 2 O/石墨烯复合材料，并在空气中进行了退火处理。研究了石墨烯的引入对V2 O 5·nH 2 O的微观结构和储钠性能的影响。XRD、拉曼和TGA分析证实石墨烯成功地掺入到V2 O 5. nH 2 O颗粒中; XPS测试表明石墨烯的掺入导致V4+在V2 O 5. nH 2 O颗粒中的引入。作为钠离子电池（SIB）的正极材料，V2 O 5·nH 2 O/石墨烯复合材料与纯V2 O 5·nH 2 O相比，表现出更高的储钠容量、更好的倍率性能、更强的Na+扩散能力和更低的电化学反应电阻。然而，石墨烯的掺入并没有改善V2 O 5·nH 2 O的循环稳定性。非原位XRD分析表明，V2 O 5·nH 2 O的层状结构在循环过程中发生了破坏，这是容量衰减的原因。
V2O5·nH2O/graphene composites have been fabricated via a facile sol–gel method followed with an annealing treatment in air. The influence of incorporation of graphene on the microstructure and sodium storage performance of V2O5·nH2O were investigated. XRD, Raman, and TGA analyses validated that graphene was successfully incorporated in V2O5·nH2O particles; XPS tests revealed that the incorporation of graphene induced more V4+ in the V2O5·nH2O. When evaluated as cathode materials for sodium-ion batteries (SIBs), the V2O5·nH2O/graphene composites exhibited higher sodium storage capacity, better rate capability, enhanced Na+ diffusivity, and lower electrochemical reaction resistance as compared to the pure V2O5·nH2O. However, the incorporation of graphene had no improvement of the cycling stability of V2O5·nH2O. Ex situ XRD demonstrated that the layered.structure of V2O5·nH2O collapsed upon cycling, which accounts for the capacity decay of the samples.
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