还原氧化石墨烯/TiO<sub>2</sub>复合材料在钠离子电池中的电化学性能

引用本文: 许婧, 杨德志, 廖小珍, 何雨石, 马紫峰. 还原氧化石墨烯/TiO₂复合材料在钠离子电池中的电化学性能[J]. 物理化学学报, 2015, 31(5): 913-919. doi: 10.3866/PKU.WHXB201503162 shu

Citation: XU Jing, YANG De-Zhi, LIAO Xiao-Zhen, HE Yu-Shi, MA Zi-Feng. Electrochemical Performances of Reduced Graphene Oxide/Titanium Dioxide Composites for Sodium-Ion Batteries[J]. Acta Physico-Chimica Sinica, 2015, 31(5): 913-919. doi: 10.3866/PKU.WHXB201503162 shu

还原氧化石墨烯/TiO₂复合材料在钠离子电池中的电化学性能

基金项目:
上海市自然科学基金(15ZR1422300) (15ZR1422300)

国家自然科学基金(21336003, 21073120, 21006063) (21336003, 21073120, 21006063)

国家重点基础研究发展计划(973)(2014CB239700) 资助项目 (973)(2014CB239700)

摘要:

二氧化钛(TiO₂)作为有前景的钠离子电池负极材料, 具有良好的循环稳定性, 但由于其导电率较低, 而导致容量和倍率性能不佳限制了其实际应用. 本文采用喷雾干燥技术制备了氧化石墨烯/纳米TiO₂复合材料( /TiO₂), 通过热处理获得还原氧化石墨烯/TiO₂复合材料(R /TiO₂). 电化学测试结果表明, 还原氧化石墨烯改性的R /TiO₂复合材料的电化学性能得到显著提升, R 含量为4.0%(w)的R /TiO₂复合材料在各种电流密度下的可逆容量分别为183.7 mAh·g^-1 (20 mA·g^-1), 153.7 mAh·g^-1 (100 mA·g^-1)和114.4 mAh·g^-1 (600mA·g^-1), 而纯TiO₂的比容量仅为93.6 mAh·g^-1 (20 mA·g^-1), 69.6 mAh·g^-1 (100 mA·g^-1)和26.5 mAh·g^-1 (600mA·g^-1). 4.0%(w) R /TiO₂复合材料体现了良好的循环稳定性, 在100 mA·g^-1电流密度下充放电循环350个周期后, 比容量仍然保持146.7 mAh·g^-1. 同等条件下, 纯TiO₂电极比容量只有68.8 mAh·g^-1. R 包覆改性极大提高了TiO₂在钠离子电池中的电化学嵌钠/脱钠性能. R 包覆改性技术在改进钠离子电池材料性能中将有很好的应用前景.

关键词:

English

Electrochemical Performances of Reduced Graphene Oxide/Titanium Dioxide Composites for Sodium-Ion Batteries

1.
Shanghai Electrochemical Energy Devices Research Center, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
Received Date: 27 November 2014
Available Online: 08 May 2015
Fund Project:
上海市自然科学基金(15ZR1422300)

国家自然科学基金(21336003, 21073120, 21006063)

国家重点基础研究发展计划(973)(2014CB239700) 资助项目

Abstract:

Anatase TiO₂ shows excellent long-term cycling stability as an anode for sodium-ion batteries. However, the low specific capacity and poor rate capability resulting from its intrinsic low electrical conductivity limit its applications. In this work, TiO₂ nanoparticles were coated with reduced graphene oxide (R ) using a combination of spray-drying and heat treatment. Electrochemical tests showed that the obtained R /TiO₂ composites had improved electrochemical performances. The reversible capacities of the R /TiO₂ [4.0% (w)] composites were 183.7 mAh·g^-1 (20 mA·g^-1), 153.7 mAh·g^-1 (100 mA·g^-1), and 114.4 mAh·g^-1 (600 mA·g^-1). Bare TiO₂ showed low capacities of 93.6mAh·g^-1 (20mA·g^-1), 69.6mAh·g^-1 (100mA·g^-1), and 26.5mAh·g^-1 (600 mA·g^-1). The 4.0%(w) TiO₂/R composites exhibited od cycling stability with a charge capacity of 146.7 mAh·g^-1 at a current density of 100 mA·g^-1 after 350 cycles, compared with 68.8 mAh·g^-1 for bare TiO₂. R modification is a promising method for improving the electrochemical performances of the sodium energystorage materials.

Key words:

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

还原氧化石墨烯/TiO₂复合材料在钠离子电池中的电化学性能

English

Electrochemical Performances of Reduced Graphene Oxide/Titanium Dioxide Composites for Sodium-Ion Batteries

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

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CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

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中国化学会秘书处

还原氧化石墨烯/TiO2复合材料在钠离子电池中的电化学性能

English

Electrochemical Performances of Reduced Graphene Oxide/Titanium Dioxide Composites for Sodium-Ion Batteries

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

还原氧化石墨烯/TiO₂复合材料在钠离子电池中的电化学性能

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs