Cable‐Type Flexible Lithium Ion Battery Based on Hollow Multi‐Helix Electrodes

Kwon, Yo Han; Woo, Sang Wook; Jung, Hye Ran; Yu, Hyung Kyun; Kim, Kitae; Oh, Byung Hun; Ahn, Soonho; Lee, Sang Young; Song, Seung‐Wan; Cho, Jaephil; Shin, Heon Cheol; Kim, Je Young

doi:10.1002/adma.201202196

Cited by 337 publications

(232 citation statements)

References 22 publications

(24 reference statements)

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“…The testing method of L is simple and can be realized in most laboratories. [40][41][42][43][44][45] Several typical applications of L on flexible LIBs and SCs are shown in Figure 3. In a cable-type flexible zinc-air battery, [40] no obvious differences are observed in the discharge voltage during bending from the initial L of 7 cm to 3 cm and recovering back to 7 cm (Figure 3a), indicating a good mechanical performance under external strain.…”

Section: End-to-end Distance (L)mentioning

confidence: 99%

Mechanical Analyses and Structural Design Requirements for Flexible Energy Storage Devices

Mao

Meng

Ahmad

et al. 2017

Advanced Energy Materials

180

146

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degree of the entire electronic systems. In the integrated flexible electronic system, energy storage devices [14,[16][17][18][19][20] play important roles in connecting the preceding energy harvesting devices and the following energy utilization devices (Figure 1). Rechargeable secondary batteries and supercapacitors (SCs) are two typical energy storage devices. [21] Several excellent review papers [21][22][23][24][25][26] reported significant progresses achieved in flexible lithium-ion batteries (LIBs) and SCs by taking advantage of novel electrode materials, current collectors, and solid-state electrolytes. The application areas and lifetime of flexible power sources strongly depend on their mechanical deformation tolerance and the electrical property retention under deformation. Qualified flexible power sources should be able to endure high strain induced by external mechanical deformation, such as bending, compressing, stretching, folding, and twisting, while maintaining their electrochemical performance stability and structural integrity. Therefore, the mechanical reliability assessment and electrical property analysis of flexible devices need to be given much attention for future application.Tolerance in bending into a certain curvature is the major mechanical deformation characteristic of flexible energy storage devices. Thus far, several bending characterization parameters and various mechanical methods have been proposed to evaluate the quality and failure modes of the said devices by investigating their bending deformation status and received strain. Some of these mechanical metrologies were derived from the early research on flexible semiconductor devices of micro-electromechanical system (MEMS) [27,28] and TFTs. [29] However, comparing those numerous measurement data with one another is difficult because of the various theories and methods adopted by different research groups and the lack of unified assessment criteria. [26] The flexibility of flexible devices is generally realized not only by use of intuitive soft electrode materials but also by optimizing their mechanical structural design. [25] Detailed analysis on bending mechanics combining experimental and theoretical results provide not only reliable test methods to describe the bending state but also guidance for configuration design of devices against mechanical failure.The current review emphasizes on three main points: (1) key parameters that characterize the bending level of flexible energy storage devices, such as bending radius, bending Flexible energy storage devices with excellent mechanical deformation performance are highly required to improve the integration degree of flexible electronics. Unlike those of traditional power sources, the mechanical reliability of flexible energy storage devices, including electrical performance retention and deformation endurance, has received much attention. To provide the guideline for the construction design of devices, the strain distribution and failure modes in the entire architecture should b...

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Section: End-to-end Distance (L)mentioning

confidence: 99%

Mechanical Analyses and Structural Design Requirements for Flexible Energy Storage Devices

Mao

Meng

Ahmad

et al. 2017

Advanced Energy Materials

180

146

View full text Add to dashboard Cite

show abstract

“…Strong, flexible yarn-based supercapacitors are attractive as power sources for miniaturized electronic devices [13][14][15][16] such as micro-robots, wearable electronic textiles and implantable medical devices, as they can have small volumes and could be easily integrated into variously shaped structures. However, technical challenges have limited the development of strong, flexible and weavable yarns and fibres having attractive supercapacitor performance.…”

mentioning

confidence: 99%

Ultrafast charge and discharge biscrolled yarn supercapacitors for textiles and microdevices

et al. 2013

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Flexible, wearable, implantable and easily reconfigurable supercapacitors delivering high energy and power densities are needed for electronic devices. Here we demonstrate weavable, sewable, knottable and braidable yarns that function as high performance electrodes of redox supercapacitors. A novel technology, gradient biscrolling, provides fastion-transport yarn in which hundreds of layers of conducting-polymer-infiltrated carbon nanotube sheet are scrolled into B20 mm diameter yarn. Plying the biscrolled yarn with a metal wire current collector increases power generation capabilities. The volumetric capacitance is high (up to B179 F cm À 3 ) and the discharge current of the plied yarn supercapacitor linearly increases with voltage scan rate up to B80 Vs À 1 and B20 Vs À 1 for liquid and solid electrolytes, respectively. The exceptionally high energy and power densities for the complete supercapacitor, and high cycle life that little depends on winding or sewing (92%, 99% after 10,000 cycles, respectively) are important for the applications in electronic textiles.

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“…Recently, Kim and co‐workers117 developed a helically coaxial LIB with hollow spiral multihelix anode structure that was vital for good mechanical stability and flexibility. Copper wires deposited with nickel (Ni)–tin (Sn) active materials were twisted to form a bundle of four such wires integrated into a hollow structure anode and PET is used as the separator and aluminum wire as cathode current collector ( Figure 13 a).…”

Section: Fiber‐shaped Energy Storage Devicesmentioning

confidence: 99%

Section: Fiber‐shaped Energy Storage Devicesmentioning

confidence: 99%

Fiber‐Type Solar Cells, Nanogenerators, Batteries, and Supercapacitors for Wearable Applications

et al. 2018

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Wearable electronic devices represent a paradigm change in consumer electronics, on‐body sensing, artificial skins, and wearable communication and entertainment. Because all these electronic devices require energy to operate, wearable energy systems are an integral part of wearable devices. Essentially, the electrodes and other components present in these energy devices should be mechanically strong, flexible, lightweight, and comfortable to the user. Presented here is a critical review of those materials and devices developed for energy conversion and storage applications with an objective to be used in wearable devices. The focus is mainly on the advances made in the field of solar cells, triboelectric generators, Li‐ion batteries, and supercapacitors for wearable device development. As these devices need to be attached/integrated with the fabric, the discussion is limited to devices made in the form of ribbons, filaments, and fibers. Some of the important challenges and future directions to be pursued are also highlighted.

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Cable‐Type Flexible Lithium Ion Battery Based on Hollow Multi‐Helix Electrodes

Cited by 337 publications

References 22 publications

Mechanical Analyses and Structural Design Requirements for Flexible Energy Storage Devices

Mechanical Analyses and Structural Design Requirements for Flexible Energy Storage Devices

Ultrafast charge and discharge biscrolled yarn supercapacitors for textiles and microdevices

Fiber‐Type Solar Cells, Nanogenerators, Batteries, and Supercapacitors for Wearable Applications

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