V<sub>2</sub>O<sub>5</sub>/石墨烯纳米复合材料的合成及储钠性能研究

郑浩; 彭毅; 王仕伟; 孟伟巍; 杜光超

doi:10.7513/j.issn.1004-7638.2023.01.007

V₂O₅/石墨烯纳米复合材料的合成及储钠性能研究

doi: 10.7513/j.issn.1004-7638.2023.01.007

攀钢集团研究院有限公司, 钒钛资源综合利用国家重点实验室, 四川攀枝花617000

详细信息

作者简介:
郑浩，1986年出生，男，重庆梁平人，博士，研究员，主要从事纳米功能材料开发等研究，E-mail：zhengaho1986@126.com

中图分类号: TF841.3,TM911
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出版历程
- 收稿日期: 2022-08-10
- 刊出日期: 2023-02-28

Synthesis and sodium storage properties of V₂O₅/graphene nanocomposites

State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Pangang Group Research Institute Co., Ltd., Panzhihua 617000, Sichuan, China

摘要

摘要: 五氧化二钒(V₂O₅)因其具有层状结构、高容量、低成本、资源丰富、高的Na⁺离子电导率、Na⁺嵌入/脱嵌时体积变化小、中等电位平台等优点而受到广泛关注。以V₂O₅和草酸为原料，采用水热法成功制备了V₂O₅/石墨烯纳米复合材料（V₂O₅/rGO）。结果表明：石墨烯与V₂O₅纳米线相互紧密交织，形成连续的V₂O₅-石墨烯网络结构；V₂O₅-石墨烯网络结构提供了快速的电子转移速度，扩展了电极材料与电解液的有效接触面积，提高了材料的导电性，缓冲了钠离子嵌入引起的体积变化，从而使V₂O₅/rGO纳米复合材料的储钠性能得到有效地改善（100 mA/g时，100次循环后，放电比容量为154 mAh/g）。
- V₂O₅ /
- 石墨烯 /
- 纳米复合材料 /
- 钠离子电池 /
- 正极材料 /
- 储钠性能
Abstract: Vanadium pentoxide (V₂O₅) has attracted extensive attention due to its layered structure, abundant resources, high capacity, low cost, high Na⁺ ionic conductivity, small volume change during Na-ion insertion/extraction, and mesopotential platform. V₂O₅/graphene nanocomposites were successfully prepared by hydrothermal method, using oxalic acid and V₂O₅ as raw materials. The results show that the V₂O₅ nanowires and graphene are closely intertwined with each other, forming a V₂O₅-graphene nanocomposite with a tightly network structure. The structure can provide fast electron transfer kinetics, expand the effective contact area between the electrolyte and the electrode material, improve the conductivity of the material and buffer volume changes during Na-ion insertion/extraction. Thus, the electrochemistry properties of V₂O₅/rGO nanocomposites are effectively improved (Over 100 cycles, 154 mAh/g at 100 mA/g).
- vanadium pentoxide /
- reduced graphene oxide /
- nanocomposites /
- sodium-ion batteries /
- cathode materials /
- sodium storage properties

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图 1 (a) V₂O₅和V₂O₅/rGO样品的XRD谱图，(b)石墨烯和V₂O₅/rGO样品的拉曼谱图，(c) V₂O₅/rGO纳米复合材料、(d) V 2p、(e) O 1s和 (f) C1s的XPS谱图

Figure 1. (a) XRD patterns of the V₂O₅ and V₂O₅/rGO samples, (b) Raman spectra of the graphene and V₂O₅/rGO samples, XPS scan spectra of the V₂O₅/rGO sample (c) full scan spectra, (d) V 2p, (e) O 1s and (f) C1s

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图 2 (a, b) V₂O₅和(c, d) V₂O₅/rGO的SEM形貌，(e, f) V₂O₅/rGO的(HR-)TEM形貌

Figure 2. SEM images of the V₂O₅ (a, b) and V₂O₅/rGO (c, d) samples, (e, f) (HR-)TEM images of the V₂O₅/rGO sample

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图 3 (a) V₂O₅/rGO样品的循环伏安曲线，(b) V₂O₅样品的充放电曲线，(c)V₂O₅/rGO样品的充放电曲线，(d) V₂O₅和V₂O₅/rGO样品的循环性能，(e) V₂O₅和V₂O₅/rGO样品的倍率性能，(f) V₂O₅和V₂O₅/rGO样品的阻抗性能

Figure 3. (a) CV profiles of the V₂O₅ and V₂O₅/rGO samples, (b, c) Charge/discharge profiles of theV₂O₅ and V₂O₅/rGO samples, (d) Cycle performances of the V₂O₅ and V₂O₅/rGO samples, (e) Rate performance of the V₂O₅ and V₂O₅/rGO samples, (f) EIS of the V₂O₅ and V₂O₅/rGO samples

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