Building thermally stable Li-ion batteries using a temperature-responsive cathode

Ji, Wei-xiao; Feng, Wenquan; Liu, Daotan; Qian, Jiangfeng; Cao, Yuliang; Chen, Zhongxue; Yang, Hanxi; Ai, Xinping

doi:10.1039/c6ta03407a

Cited by 75 publications

(51 citation statements)

References 25 publications

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“…Flame‐retardant coatings are often required for packaging of inflammable substances, encapsulation of energy storage devices, and personal protective equipment to prevent the fire from starting . Conventional flame retardants include organohalogen and organophosphate compounds, metal hydroxide films, borate additives, and clay coatings .…”

Section: Methodsmentioning

confidence: 99%

Crumpling and Unfolding of Montmorillonite Hybrid Nanocoatings as Stretchable Flame‐Retardant Skin

Chang

Tian

Wee

et al. 2018

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Flame-retardant coatings are widely used in a variety of personnel or product protection, and many applications would benefit from film stretchability if suitable materials are available. It is challenging to develop flame-retardant coatings that are stretchable, eco-friendly, and capable of being integrated on mechanically dynamic devices. Here, a concept is reported that uses pretextured montmorillonite (MMT) hybrid nanocoatings that can undergo programed unfolding to mimic the stretchability of elastomeric materials. These textured MMT coatings can be transferred onto an elastomeric substrate to achieve an MMT/elastomer bilayer device with high stretchability (225% areal strain) and effective flame retardancy. The bilayer composite is utilized as flame-retardant skin for a soft robotic gripper, and it is demonstrated that the actuated response can manipulate and rescue irregularly shaped objects from a fire scene. Furthermore, by depositing the conformal MMT nanocoatings on nitrile gloves, the firefree gloves can endure direct flame contact without ignition.

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Section: Methodsmentioning

confidence: 99%

Crumpling and Unfolding of Montmorillonite Hybrid Nanocoatings as Stretchable Flame‐Retardant Skin

Chang

Tian

Wee

et al. 2018

Small

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“…However, LIBs are hindered by safety issues such as high flammability of liquid electrolytes, showing flash points around room temperature (between 16 and 33 °C) . Several techniques and methods have been developed to enhance the safety of LIBs based on either external or internal protection mechanisms . External protection usually uses a control system, including temperature sensors, pressure valves and a variety of electronic devices, to protect and ensure normal operating conditions of LIBs .…”

Section: Recent Applications Of Pyroresistive Materialsmentioning

confidence: 99%

Pyroresistivity in conductive polymer composites: a perspective on recent advances and new applications

Liu

Zhang

Porwal

et al. 2018

Polymer International

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Conductive polymer composites (CPCs) with pyroresistive behaviour are of interest for a wide variety of applications such as safe batteries, resettable fuses, temperature sensors and self‐regulating heating devices. Due to their ease of processing, low density, tunable electrical properties, good oxidation resistance, and good flexibility and toughness, CPCs have become the preferred choice of pyroresistive materials in a number of applications. The pyroresistive behaviour of CPCs can be tuned to satisfy the specific requirements of different applications. In this perspective paper, recent progress in the use of pyroresistive CPCs is reviewed. In particular, various factors influencing their performance are discussed and compared, in connection with the associated application, with a special focus on reproducibility and positive temperature coefficient intensity levels. Some of the remaining challenges are identified, together with future prospects in this evolving field. © 2018 Society of Chemical Industry

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“…With the recent development of portable electronics and electric vehicles, there is a strong demand for advanced lithium-ion batteries (LIB) with high energy density [1][2][3][4][5][6][7][8][9]. Although the energy density of LIBs keeps increasing under the intensive research efforts, safety issues associated with internal short circuit and the resulting combustion of flammable electrolyte impedes the further development and commercial application of next-generation LIBs [10]. It is well-accepted that the shrinking of separators under elevated temperature accelerates the battery shorting and thermal runaway process [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Electrospun Core-Shell Nanofiber as Separator for Lithium-Ion Batteries with High Performance and Improved Safety

Liang

Zhao

2019

Energies

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Though the energy density of lithium-ion batteries continues to increase, safety issues related to the internal short circuit and the resulting combustion of highly flammable electrolytes impede the further development of lithium-ion batteries. It has been well-accepted that a thermal stable separator is important to postpone the entire battery short circuit and thermal runaway. Traditional methods to improve the thermal stability of separators include surface modification and/or developing alternate material systems for separators, which may affect the battery performance negatively. Herein, a thermostable and shrink-free separator with little compromise in battery performance was prepared by coaxial electrospinning and tested. The separator consisted of core-shell fiber networks where poly (vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) layer served as shell and polyacrylonitrile (PAN) as the core. This core-shell fiber network exhibited little or even no shrinking/melting at elevated temperature over 250 °C. Meanwhile, it showed excellent electrolyte wettability and could take large amounts of liquid electrolyte, three times more than that of conventional Celgard 2400 separator. In addition, the half-cell using LiNi1/3Co1/3Mn1/3O2 as cathode and the aforementioned electrospun core-shell fiber network as separator demonstrated superior electrochemical behavior, stably cycling for 200 cycles at 1 C with a reversible capacity of 130 mA·h·g−1 and little capacity decay.

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Building thermally stable Li-ion batteries using a temperature-responsive cathode

Abstract: A temperature-responsive cathode is developed by coating an ultra-thin layer of poly(3-octylthiophene) in between an Al substrate and cathode-active layer.

Cited by 75 publications

References 25 publications

Crumpling and Unfolding of Montmorillonite Hybrid Nanocoatings as Stretchable Flame‐Retardant Skin

Crumpling and Unfolding of Montmorillonite Hybrid Nanocoatings as Stretchable Flame‐Retardant Skin

Pyroresistivity in conductive polymer composites: a perspective on recent advances and new applications

Electrospun Core-Shell Nanofiber as Separator for Lithium-Ion Batteries with High Performance and Improved Safety

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