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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; Fang, HT (reprint author), Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China.
2017-03-01
Source Publication2D MATERIALS
ISSN2053-1583
Volume4Issue:1Pages:-
AbstractBenefiting 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.; 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.
description.department[feng, bingmei ; wang, huixin ; zhang, yingqi ; fang, hai-tao] harbin inst technol, sch mat sci & engn, harbin 150001, peoples r china ; [shan, xuyi ; liu, min ; li, feng] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china ; [feng, bingmei ; guo, jinghua ; feng, jun] lawrence berkeley natl lab, adv light source, berkeley, ca 94720 usa
KeywordMesoporous Tio2 Graphene Flexible Electrode Lithium Ion Battery
Subject AreaMaterials Science, Multidisciplinary
Funding OrganizationNational 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]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78278
Collection中国科学院金属研究所
Corresponding AuthorFang, HT (reprint author), Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China.
Recommended Citation
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, HT .(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):-.
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