Free-standing hybrid film of less defective graphene coated with mesoporous TiO2 for flexible lithium ion batteries with fast charging/discharging capabilities

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	Free-standing hybrid film of less defective graphene coated with mesoporous TiO2 for flexible lithium ion batteries with fast charging/discharging capabilities
	Feng, Bingmei ; Wang, Huixin ; Zhang, Yingqi ; Shan, Xuyi ; Liu, Min ; Li, Feng ; Guo, Jinghua ; Feng, Jun ; Fang, Hai-Tao
刊名	2D MATERIALS
	2017-03-01
卷号	4 期号:1 页码:-
关键词	mesoporous TiO2 graphene flexible electrode lithium ion battery
ISSN号	2053-1583
通讯作者	Fang, HT (reprint author), Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China.
中文摘要	Benefiting from extremely high conductivity, graphene sheets (GS) with very low defect density are preferable to reduced graphene oxide sheets for constructing the free-standing hybrid electrodes of flexible electrochemical energy storage devices. However, due to the hydrophobic nature and deficiency of nucleation sites, how to uniformly and intimately anchor electrochemically active materials onto less defective GS is a challenge. Herein, a free-standing and mechanically flexible hybrid film with two-layer structure, mesoporous TiO2 anchored less defective GS hybrid (mTiO(2)-GS) upper-layer and graphene under-layer, denoted as mTiO(2)-GS/G, is fabricated. The hydrolysis of a Ti glycolate aqueous sol solution were applied to form mTiO(2). The decoration of less defective GS with sodium lignosulfonate (SLS) surfactant is crucial for anchoring TiO2 nanoparticles (NPs). The aromatic rings of SLS favor a non-destructive functionalization of GS through the p-p stacking interaction. The sulfonic acid groups and hydroxyl groups of SLS, respectively, greatly improve the dispersity of GS in water and trigger the nucleation of TiO2 through the oxolation in the hydrolysis of Ti glycolate sol solution. The following characteristics of free-standing mTiO(2)-GS/Gelectrode benefit the fast charging/discharging capabilities: highly conductive graphene framework, ultra-small NPs (similar to 5.0 nm) in mTiO(2) anchored, high specific surface area (202.5 m(2) g(-1)), abundant mesopores (0.32 cm(3) g(-1)),intimate interfacial interaction between mTiO(2) and GS, robust contact between the mTiO(2)-GS upper-layer and an under-layer of bare graphene as the current collector. In coin half-cells, the mTiO(2)-GS/Gelectrode delivers a capacity of 130 mA h g(-1) at 50 C, and 71 mA h g(-1) at 100 C, and it also exhibits excellent cycle stability up to 10 000 cycles under 10 C, with a degradation rate of 0.0033% per cycle. When packed in flexible cells, the mTiO(2)-GS/Gelectrode maintains fast charging/discharging capabilities regardless of being flat or bent. Furthermore, because of the high durability of mTiO(2)-GS/Gelectrode, repeated deformations do not cause extra capacity degradation.
学科主题	Materials Science, Multidisciplinary
收录类别	SCI
资助信息	National Natural Science Foundation of China [51272051, 50872026, 51525206, U1401243]; Research Fund for the Doctoral Program of Higher Education of China [20112302110014]; Academic Expert Program of Harbin [RC2012XK017008]; Harbin Institute of Technology; Office of Science, Office of Basic Energy Sciences, of the US. Department of Energy [DE-AC02-05CH11231]
语种	英语
公开日期	2017-08-17
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/78278]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	Feng, Bingmei,Wang, Huixin,Zhang, Yingqi,et al. Free-standing hybrid film of less defective graphene coated with mesoporous TiO2 for flexible lithium ion batteries with fast charging/discharging capabilities[J]. 2D MATERIALS,2017,4(1):-.
APA	Feng, Bingmei.,Wang, Huixin.,Zhang, Yingqi.,Shan, Xuyi.,Liu, Min.,...&Fang, Hai-Tao.(2017).Free-standing hybrid film of less defective graphene coated with mesoporous TiO2 for flexible lithium ion batteries with fast charging/discharging capabilities.2D MATERIALS,4(1),-.
MLA	Feng, Bingmei,et al."Free-standing hybrid film of less defective graphene coated with mesoporous TiO2 for flexible lithium ion batteries with fast charging/discharging capabilities".2D MATERIALS 4.1(2017):-.