Flexible energy storage devices based on graphene paper

Gwon, Hyeokjo; Kim, Hyun Suk; Lee, Kye Ung; Seo, Dong‐Hwa; Park, Yun Chang; Lee, Yun‐Sung; Ahn, Byung Tae; Kang, Kisuk

doi:10.1039/c0ee00640h

Cited by 552 publications

(328 citation statements)

References 41 publications

(53 reference statements)

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“…[1][2][3][4] Among the emerging technologies, there is considerable interest in flexible field emission (FE) emitters due to their unique lightweight, conformable and flexible nature, which give them the significant advantage of being utilized in roll-up flexible FE displays, 3 e-papers 5 and high-performance X-ray tubes. 6 To enable such next-generation flexible devices, flexible cathodes must be used as the fundamental starting component to replace conventional emitters grown on rigid substrates.…”

Section: Introductionmentioning

confidence: 99%

Highly flexible and robust N-doped SiC nanoneedle field emitters

et al. 2015

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Flexible field emission (FE) emitters, whose unique advantages are lightweight and conformable, promise to enable a wide range of technologies, such as roll-up flexible FE displays, e-papers and flexible light-emitting diodes. In this work, we demonstrate for the first time highly flexible SiC field emitters with low turn-on fields and excellent emission stabilities. n-Type SiC nanoneedles with ultra-sharp tips and tailored N-doping levels were synthesized via a catalyst-assisted pyrolysis process on carbon fabrics by controlling the gas mixture and cooling rate. The turn-on field, threshold field and current emission fluctuation of SiC nanoneedle emitters with an N-doping level of 7.58 at.% are 1.11 V μm − 1 , 1.55 V μm − 1 and 8.1%, respectively, suggesting the best overall performance for such flexible field emitters. Furthermore, characterization of the FE properties under repeated bending cycles and different bending states reveal that the SiC field emitters are mechanically and electrically robust with unprecedentedly high flexibility and stabilities. These findings underscore the importance of concurrent morphology and composition controls in nanomaterial synthesis and establish SiC nanoneedles as the most promising candidate for flexible FE applications. NPG Asia Materials (2015) 7, e157; doi:10.1038/am.2014.126; published online 23 January 2015 INTRODUCTIONFlexible electronic devices have attracted extensive attention in recent decades because of their numerous promising applications, such as flexible energy-storage devices, wearable energy-harvesting systems and stretchable electronics. 1-4 Among the emerging technologies, there is considerable interest in flexible field emission (FE) emitters due to their unique lightweight, conformable and flexible nature, which give them the significant advantage of being utilized in roll-up flexible FE displays, 3 e-papers 5 and high-performance X-ray tubes. 6 To enable such next-generation flexible devices, flexible cathodes must be used as the fundamental starting component to replace conventional emitters grown on rigid substrates. These flexible emitters should maintain their original or even better FE properties as well as excellent electrical and mechanical performances after bending, compressing, twisting and stretching. 7,8 To date, a variety of cathodes have been developed based on flexible substrates such as polymers, 9 graphene 7 and carbon fabrics. 10 However, material-and fabrication-related obstacles to the realization of high-performance flexible emitters remain.Silicon carbide (SiC) is an excellent material candidate for constructing advanced FE emitters. SiC is a third-generation wide band-gap semiconductor with excellent physical properties such as high strength and stiffness, high-temperature stability, corrosion resistance and high thermal conductivity. [11][12][13] To date, several studies have explored the FE properties of nanostructured SiC emitters

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Section: Introductionmentioning

confidence: 99%

Highly flexible and robust N-doped SiC nanoneedle field emitters

et al. 2015

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“…Metal oxide nanowires (8,9) and carbon nanomaterials such as carbon nanotubes (6,(10)(11)(12) and graphene paper (13) have been recently demonstrated for use in flexible LIBs. However, electron transport in these electrodes is slow because of the relatively low quality of nanomaterials (such as chemically derived graphene) and/or high junction contact resistance between them.…”

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confidence: 99%

Flexible graphene-based lithium ion batteries with ultrafast charge and discharge rates

Chen

Ren

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

743

494

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There is growing interest in thin, lightweight, and flexible energy storage devices to meet the special needs for next-generation, high-performance, flexible electronics. Here we report a thin, lightweight, and flexible lithium ion battery made from graphene foam, a three-dimensional, flexible, and conductive interconnected network, as a current collector, loaded with Li 4 Ti 5 O 12 and LiFePO 4 , for use as anode and cathode, respectively. No metal current collectors, conducting additives, or binders are used. The excellent electrical conductivity and pore structure of the hybrid electrodes enable rapid electron and ion transport. For example, the Li 4 Ti 5 O 12 / graphene foam electrode shows a high rate up to 200 C, equivalent to a full discharge in 18 s. Using them, we demonstrate a thin, lightweight, and flexible full lithium ion battery with a high-rate performance and energy density that can be repeatedly bent to a radius of 5 mm without structural failure and performance loss.flexible device | full battery T he development of next-generation flexible electronics (1), such as soft, portable electronic products, roll-up displays, wearable devices, implantable biomedical devices, and conformable health-monitoring electronic skin, requires power sources that are flexible (2, 3). Similar to conventional energy storage devices, flexible power sources with high capacity and rate performance that enable electronic devices to be continuously used for a long time and fully charged in a very short time are very important for applications of high-performance flexible electronics (4-7). Lithium ion batteries (LIBs) have a high capacity but usually suffer from a low charge/discharge rate compared with another important electrochemical storage device, supercapacitors. Therefore, it is highly desired to fabricate a flexible electrochemical energy storage system with a supercapacitor-like fast charge/discharge rate and battery-like high capacity. However, the fabrication of such an energy storage device remains a great challenge owing to the lack of reliable materials that combine superior electron and ion conductivity, robust mechanical flexibility, and excellent corrosion resistance in electrochemical environments.Using nano-sized materials to prepare electrodes is one of the most promising routes toward flexible batteries. Metal oxide nanowires (8, 9) and carbon nanomaterials such as carbon nanotubes (6, 10-12) and graphene paper (13) have been recently demonstrated for use in flexible LIBs. However, electron transport in these electrodes is slow because of the relatively low quality of nanomaterials (such as chemically derived graphene) and/or high junction contact resistance between them. As a consequence, only a moderate charge/discharge rate has been obtained in these flexible batteries. It is generally believed that the charge/discharge rate of a LIB depends critically on the migration rate of lithium ions and electrons through the electrolyte and bulk electrodes into active electrode materials. Strategies to inc...

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“…A rapidly growing demand for portable consumer electronics, such as flexible displays, mobile phones and notebook computers, has greatly promoted the development of flexible energy devices in all-solid-state [1][2][3][4][5][6][7] . As the futuregeneration energy storage device, the flexible thin-film supercapacitor in all-solid-state offers the synergic benefits of flexibility, thinness and transparency 2,[8][9][10][11][12] .…”

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confidence: 99%

Two-dimensional vanadyl phosphate ultrathin nanosheets for high energy density and flexible pseudocapacitors

et al. 2013

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Two-dimensional materials have been an ideal material platform for constructing flexible ultrathin-film supercapacitors, offering great advantages of flexibility, ultra-thinness and even transparency. Exploring new two-dimensional pseudocapacitive materials with high electrochemical activity is needed to achieve flexible ultrathin-film supercapacitors with higher energy densities. Here we report an inorganic graphene analogue, a 1 -vanadyl phosphate ultrathin nanosheets with less than six atomic layers, as a promising material to construct a flexible ultrathin-film pseudocapacitor in all-solid-state. The material exhibits a high potential plateau of B1.0 V in aqueous solutions, approaching the electrochemical potential window of water (1.23 V). The as-established flexible supercapacitor achieves a high redox potential (1.0 V) and a high areal capacitance of 8,360.5 mF cm À 2 , leading to a high energy density of 1.7 mWh cm À 2 and a power density of 5.2 mW cm À 2 .

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Flexible energy storage devices based on graphene paper

Cited by 552 publications

References 41 publications

Highly flexible and robust N-doped SiC nanoneedle field emitters

Highly flexible and robust N-doped SiC nanoneedle field emitters

Flexible graphene-based lithium ion batteries with ultrafast charge and discharge rates

Two-dimensional vanadyl phosphate ultrathin nanosheets for high energy density and flexible pseudocapacitors

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