TiO2/石墨烯复合物的制备及其嵌脱锂行为研究

doi:10.15541/jim20150172

无机材料学报 ›› 2015, Vol. 30 ›› Issue (11): 1218-1222.DOI: 10.15541/jim20150172 CSTR: 32189.14.10.15541/jim20150172

TiO₂/石墨烯复合物的制备及其嵌脱锂行为研究

崔瑜, 王艳芝, 陈召凡

(燕山大学环境与化学工程学院, 燕山大学河北省应用化学重点实验室, 秦皇岛 066004)

收稿日期:2015-04-09 修回日期:2015-05-25 出版日期:2015-11-20 网络出版日期:2015-10-20
作者简介:崔瑜(1988–), 男, 硕士研究生. E-mail: 928872829@qq.com
基金资助:
河北省自然科学基金(B2011203074) Natural Science Foundation of Hebei Province, China(B2011203074)

Preparation and Electrochemical Lithium Insertion of TiO₂/Graphene Nanocomposites

CUI Yu, WANG Yan-Zhi, CHEN Zhao-Fan

(College of Environmental and Chemical Engineering, Yanshan University, Hebei Key Laborary of Applied Chemistry Yanshan University, Qinhuangdao 066004, China)

Received:2015-04-09 Revised:2015-05-25 Published:2015-11-20 Online:2015-10-20
About author:CUI Yu. E-mail: 928872829@qq.com
Supported by:
Natural Science Foundation of Hebei Province, China(B2011203074)

摘要/Abstract

摘要：

以钛酸丁酯为TiO₂前驱体, 通过水热法制得TiO₂/石墨烯复合物。使用X射线衍射(XRD)、热重分析(TG)、透射电镜(TEM)、扫描电镜(SEM)和电化学充放电等手段对材料进行了表征和分析。结果表明: TiO₂颗粒均匀地分散在石墨烯的表面, 复合物中石墨烯的含量为24.67%。当该材料用作锂离子电池负极材料时, 在2C的放电倍率下, 首次放电容量为384.35 mAh/g, 循环100次后的放电容量为130.26 mAh/g, 是纯TiO₂电极放电容量的2.93倍。与纯TiO₂电极相比, TiO₂/石墨烯复合物的电荷转移电阻较低。TiO₂/石墨烯复合物具有较好的倍率性能和较高的电化学反应活性。

关键词: 锂离子电池, 负极材料, TiO2, 纳米复合物

Abstract:

TiO₂/Graphene nanocomposites was synthesized through solvothermal method with butyl titanate as TiO₂precursor. The character of nanocomposites was measured by scanning electron microscope (SEM), thermogravimetry (TG), X-ray diffraction (XRD) and electrochemical measurements. The result shows that TiO₂nanoparticles are uniformly wrapped in the graphene sheets. The graphene content of TiO₂/Graphene nanocomposite is 24.67wt%. When the TiO₂/Graphene nanocomposites are used as anode materials for lithium-ion battery, the initial discharge capacity of the nanocomposite electrode is 384.35 mAh/g at a current rate of 2C. It delivers a capacity of 130.26 mAh/g after 100 charge-discharge cycles, 2.93 times as high as that of the pure TiO₂ nanoparticles electrode_. The charge transfer resistance of the nanocomposites is lower than that of TiO₂. The nanocomposite electrode exhibits good rate capability and excellent electrochemical performance as compared with the pure TiO₂ electrode.

Key words: lithium ion battery, a anode material, TiO2, nanocomposite

中图分类号:

O646

崔瑜, 王艳芝, 陈召凡. TiO₂/石墨烯复合物的制备及其嵌脱锂行为研究[J]. 无机材料学报, 2015, 30(11): 1218-1222.

CUI Yu, WANG Yan-Zhi, CHEN Zhao-Fan. Preparation and Electrochemical Lithium Insertion of TiO₂/Graphene Nanocomposites[J]. Journal of Inorganic Materials, 2015, 30(11): 1218-1222.

图/表 4

图1 TiO2/Graphene复合物的XRD谱图(a)和热重曲线(b)

Fig. 1 XRD patterns (a) and TG curves (b) of TiO2/Graphene nanocomposites

图2 TiO2/Graphene复合物的SEM照片(a)和TEM照片(b)

Fig. 2 SEM (a) and TEM (b) images of TiO2/Graphene nanocomposites

图3 纯TiO2和TiO2/Graphene复合物电极的充放电曲线(a)、循环伏安曲线(b)、循环曲线(c)和倍率曲线(d)

Fig. 3 Discharge capacity and charge capacity (a), cycle voltammograms (b), cycle stability (c), rate performance (d) of pure TiO2 and TiO2/graphene nanocomposites electrodes

图4 纯TiO2和TiO2/Graphene复合物电极的模拟电路和交流阻抗谱

Fig. 4 Corresponding equivalent circuit and impedance spectra of pure TiO2 and TiO2/Graphene nanocomposites electrodes tested at 2C rate after 3 cycles

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TiO₂/石墨烯复合物的制备及其嵌脱锂行为研究

Preparation and Electrochemical Lithium Insertion of TiO₂/Graphene Nanocomposites

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