二维褶皱状V<sub>2</sub>O<sub>5</sub>纳米材料的制备和储锂性能

doi:10.11901/1005.3093.2016.498

材料研究学报

2017, Vol. 31

Issue (5): 374-380 DOI: 10.11901/1005.3093.2016.498

论文

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二维褶皱状V₂O₅纳米材料的制备和储锂性能

李延伟^1,², 谢志平¹, 刘参政¹, 姚金环¹(

), 姜吉琼¹, 杨建文¹

1 广西电磁化学功能物质重点实验室桂林理工大学化学与生物工程学院桂林 541004
2 中国科学院可再生能源重点实验室广州 510640

Preparation and Lithium Storage Performance of Two Dimensional Fold-like V₂O₅ Nanomaterial

Yanwei LI^1,², Zhiping XIE¹, Canzheng LIU¹, Jinhuan YAO¹(

), Jiqiong JIANG¹, Jianwen YANG¹

1 Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China
2 Key Laboratory of Rrenewable Energy, Chinese Academy of Sciences, Guangzhou 510640, China

引用本文:

李延伟, 谢志平, 刘参政, 姚金环, 姜吉琼, 杨建文. 二维褶皱状V₂O₅纳米材料的制备和储锂性能[J]. 材料研究学报, 2017, 31(5): 374-380.
Yanwei LI, Zhiping XIE, Canzheng LIU, Jinhuan YAO, Jiqiong JIANG, Jianwen YANG. Preparation and Lithium Storage Performance of Two Dimensional Fold-like V₂O₅ Nanomaterial[J]. Chinese Journal of Materials Research, 2017, 31(5): 374-380.

全文: PDF(2718 KB) HTML

摘要:

用溶胶凝胶法制备V₂O₅凝胶,调节凝胶的pH值和后续的冷冻干燥以及退火,制备出V₂O₅纳米材料。X射线衍射(XRD)和场发射扫描电镜(FESEM)的测试结果表明,该样品是一种具有大面积二维褶皱形貌的正交晶相V₂O₅纳米材料,每个纳米片又由大量的纳米小颗粒构成。使用循环伏安(CV)、交流阻抗(EIS)、电位驰豫(PRT)和充放电测试等手段表征了样品的储锂性能,结果表明,因具有独特的二维褶皱纳米结构,该纳米材料具有比已经商业化的V₂O₅更高的放电比容量、更好的大电流充放电性能、优异的电化学循环稳定性和更好的电化学反应动力学性能。

关键词 ：材料合成与加工工艺, V₂O₅, 溶胶凝胶法, 正极材料, 储锂性能

Abstract：

V₂O₅ gel was prepared by sol-gel method and V₂O₅ nanomaterial was fabricated by freeze-drying the V₂O₅ gel with proper pH value and followed by annealing treatment. XRD and FESEM results revealed that the prepared V₂O₅ nanomaterial consists of a single orthorhombic phase small V₂O₅ nanoparticles with alarge are a two-dimensional fold-like morphology. The lithium storage performance of the prepared V₂O₅ nanomaterial was characterized by cyclic voltammetry(CV), electrochemical impedance spectroscopy(EIS), potential relaxation technique(PRT), and charge-discharge tests. Due to the unique two-dimensional fold-like nanostructure, the prepared V₂O₅ nanomaterial exhibits much higher specific discharge capacity, better high rate performance, excellent cycling stability, and enhanced electrochemical reaction kinetics rather than the commercial V₂O₅. Therefore, the two-dimensional fold-like V₂O₅ nanomaterial is a very promising cathode material for lithium-ion batteries.

Key words： synthesizing and processing technics V₂O₅ sol-gel method cathode material lithium storage performance

收稿日期: 2016-08-23

基金资助:国家自然科学基金(51664012, 51464009, 21263003)、广西自然科学基金(2015GXNSFGA139006, 2014GXNSFBA118238)和中国科学院可再生能源重点实验室开放基金(y507k61001)

作者简介:

作者简介李延伟,男,1979年生,教授

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.498 或 https://www.cjmr.org/CN/Y2017/V31/I5/374

图1 N-V2O5样品的XRD谱

图2 N-V2O5和C-V2O5样品的FESEM图

图3 N-V2O5和C-V2O5的CV和EIS图

图4 N-V2O5和C-V2O5电极的循环性能和倍率性能图及相应的充放电曲线

图5 N-V2O5电极的充/放电曲线、OCP-t曲线和ln[exp(φ∞-φ)F/RT-1] vs. t曲线以及N-V2O5和C-V2O5的锂离子扩散系数

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