Super‐Aligned Carbon Nanotube Films as Current Collectors for Lightweight and Flexible Lithium Ion Batteries

Wang, Ke; Luo, Shu; Wu, Yang; He, Xingfeng; Zhao, Fei; Wang, Jiaping; Jiang, Kaili; Fan, Shanhui

doi:10.1002/adfm.201202412

Cited by 273 publications

(213 citation statements)

References 36 publications

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“…[83] In energy storage devices, the concept of flexible substrates has been extended to other components, thereby propelling the development of flexible LIBs and SCs by utilizing flexible electrodes. For example, a large range of flexible carbonbased materials, such as CNT films, [16,[84][85][86][87][88][89] carbon non-woven fabric, [90] carbon nanofiber paper, [91,92] graphene or graphene oxide paper, [93][94][95][96] and graphene foam (GF), [97,98] have been widely used as current collectors in flexible power source devices. Compared with traditional metal foil current collectors, flexible carbon-based materials present excellent flexibility, high contact area, and strong adhesion to electrode materials.…”

Section: Flexible Substrates and Membranesmentioning

confidence: 99%

“…In the study of CNT films as anode current collectors, the CNT films show good wettability to the anode graphite slurries and display lower contact resistance than traditional Cu foil (Figure 11b). [87] Cheng et al fabricated a unique flexible GF with an electrical conductivity as high as nearly 1000 S cm −1 ; for fast ion and charge transport, they developed 3D interconnected channels that can be bent into an arbitrary shape without destruction. Flexible and lightweight full LIBs were assembled by casting different electrical active material slurries on the GF electrode as electrodes; these LIBs can be bent to a radius of less than 5 mm without performance failure.…”

Section: Flexible Substrates and Membranesmentioning

confidence: 99%

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Mechanical Analyses and Structural Design Requirements for Flexible Energy Storage Devices

Mao

Meng

Ahmad

et al. 2017

Advanced Energy Materials

200

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: Flexible Substrates and Membranesmentioning

confidence: 99%

Section: Flexible Substrates and Membranesmentioning

confidence: 99%

Mechanical Analyses and Structural Design Requirements for Flexible Energy Storage Devices

Mao

Meng

Ahmad

et al. 2017

Advanced Energy Materials

200

146

View full text Add to dashboard Cite

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“…Graphene-sulfur paper electrodes with thickness of 40-60 µm and a density of 0.4-0.6 g/cm 3 were fabricated as a result. Because the PVDF binder affects rapid capacity The SACNT sheets are crossstacked on a glass substrate; the electrode slurry is coated on top of the CNT film; the electrode with the CNT current collector can be then easily separated from the glass substrate after drying [11]. (B) Fabrication of schematic for Cu 2 O-coated CNT electrodes.…”

Section: Graphenementioning

confidence: 99%

“…The sheet resistance of a single-layer SACNT was 1000 Ω/sq. Increasing the number of SACNT layers up to 20 and 100 resulted in sheet resistances of 66 Ω/sq and 11 Ω/ sq, respectively [11].…”

Section: Carbon Nanotube (Cnt)mentioning

confidence: 99%

Current Collectors for Flexible Lithium Ion Batteries: A Review of Materials

Kim¹,

Cho²

2015

Journal of Electrochemical Science and Technology

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With increasing interest in flexible electronic devices and wearable appliances, flexible lithium ion batteries are the most attractive candidates for flexible energy sources. During the last decade, many different kinds of flexible batteries have been reported. Although research of flexible lithium ion batteries is in its earlier stages, we have found that developing components that satisfy performance conditions under external deformation stress is a critical key to the success of flexible energy sources. Among the major components of the lithium ion battery, electrodes, which are connected to the current collectors, are gaining the most attention owing to their rigid and brittle character. In this mini review, we discuss candidate materials for current collectors and the previous strategies implemented for flexible electrode fabrication.

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“…And the contact between the active material and the current collector is the critical factor for transport of electrons to/from the electrode, which substantially influences the overall performance of LIBs. 16,17 However, Al foil as current collectors often show weak adhesion and limited contact area to the electrode material.18,19 Therefore, simply pasting LTO on conventional Al foil could not deliver satisfactory rate performances.17 In order to solve this issue, a few previous works addressed that carbon coating on Al foil can reduce the contact resistance and corrosion, improving electrochemical performance. 18,20 However, the conventional carbon coating (such as carbon black and graphite powder) cannot cover the Al foil to form a continuous, ultrathin, and rugged surface.…”

mentioning

confidence: 99%

Li₄Ti₅O₁₂on Graphene for High Rate Lithium Ion Batteries

Lei

Liang

Liu

et al. 2016

J. Electrochem. Soc.

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Spinel Li 4 Ti 5 O 12 has been considered as a promising anode material to substitute graphite in lithium ion batteries (LIBs) for large scale electrical energy storage due to its high safety and long cycling stability. However, the drawback of its poor rate performance still hinders it from wide practical application. In this study, with the aim to solve this issue, we have designed a wrinkled graphene layer between the active spinel Li 4 Ti 5 O 12 and aluminum current collectors by a blade coating method. This introduced wrinkled graphene layer provides larger contact area, lower contact resistance, stronger adhesion and better electrode stability of Due to its high thermal stability, superior safety, and long cycle life, LTO has been considered as a very promising alternative anode material to replace graphite in lithium ion batteries (LIBs), for large-scale storage of electricity, e.g. hybrid electric vehicles and grid-scale renewable energy plants at low costs.1-3 However, the drawback of its poor rate performance, which originates from its intrinsic low electronic conductivity, still severely hinders it from being widely and practically applied. In order to improve the rate performance of LTO, strategies have been developed, mainly aiming at enhancing the electronic and ionic conductivity of LTO. These include: reducing LTO particle size, 4-6 coating LTO by conductive carbon, 7-10 and doping LTO at Li and Ti sites with heteroelements.11-13 Although they could enhance the rate capability of LTO to a certain extend, many obstacles still remain to prevent it from being commercially deployed. For example, nano-sized or carbon-coated LTO can effectively improve the rate performance of LTO, however, these methods usually result in low tap density, low thermodynamic stability, detrimental surfacereactions, and/or high cost, resulting in lowered volumetric energy densities and/or other issues for practical applications.14,15 Another critical yet under-estimated aspect that possibly influences the facileness of electron transportation is the interface contact between LTO and Al. During manufacturing of LTO-based electrode, the active material (LTO), combined with conductive additive (i.e. carbon black) and binder (poly vinylidene fluoride, PVDF), is directly pasted onto Al foil as current collector. And the contact between the active material and the current collector is the critical factor for transport of electrons to/from the electrode, which substantially influences the overall performance of LIBs. 16,17 However, Al foil as current collectors often show weak adhesion and limited contact area to the electrode material.18,19 Therefore, simply pasting LTO on conventional Al foil could not deliver satisfactory rate performances.17 In order to solve this issue, a few previous works addressed that carbon coating on Al foil can reduce the contact resistance and corrosion, improving electrochemical performance. 18,20 However, the conventional carbon coating (such as carbon black and graphite powder) cannot cover the Al...

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Super‐Aligned Carbon Nanotube Films as Current Collectors for Lightweight and Flexible Lithium Ion Batteries

Cited by 273 publications

References 36 publications

Mechanical Analyses and Structural Design Requirements for Flexible Energy Storage Devices

Mechanical Analyses and Structural Design Requirements for Flexible Energy Storage Devices

Current Collectors for Flexible Lithium Ion Batteries: A Review of Materials

Li₄Ti₅O₁₂on Graphene for High Rate Lithium Ion Batteries

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Super‐Aligned Carbon Nanotube Films as Current Collectors for Lightweight and Flexible Lithium Ion Batteries

Cited by 273 publications

References 36 publications

Mechanical Analyses and Structural Design Requirements for Flexible Energy Storage Devices

Mechanical Analyses and Structural Design Requirements for Flexible Energy Storage Devices

Current Collectors for Flexible Lithium Ion Batteries: A Review of Materials

Li4Ti5O12on Graphene for High Rate Lithium Ion Batteries

Contact Info

Product

Resources

About

Li₄Ti₅O₁₂on Graphene for High Rate Lithium Ion Batteries