Electrospun core-shell microfiber separator with thermal-triggered flame-retardant properties for lithium-ion batteries

Li, Kai; Liu, Wei; Qiu, Yongcai; Kong, Biao; Sun, Yongming; Chen, Zheng; Zhuo, Denys; Lin, Dingchang; Cui, Yi

doi:10.1126/sciadv.1601978

Cited by 277 publications

(226 citation statements)

References 45 publications

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“…Recently, the development of nanotechnologies and bionic design has enabled efficient solutions for the fire retardancy of engineering materials, especially wood, in a more environmentally friendly way . For example, hybridizing wood with inorganic nanoparticles made of clay, Mg–Al‐layered double‐hydroxide, and calcium carbonate has proven effective at forming functional inorganic/organic materials with good thermal resistance and fire retardancy .…”

Section: Introductionmentioning

confidence: 99%

Dense, Self‐Formed Char Layer Enables a Fire‐Retardant Wood Structural Material

Gan

Chen

Wang

et al. 2019

Adv Funct Materials

145

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Wood is one of the most abundant, sustainable, and aesthetically pleasing structural materials and is commonly used in building and furniture construction. Unfortunately, the fire hazard of wood is a major safety concern for its practical applications. Herein, an effective and environmentally friendly method is demonstrated to substantially improve the fire-retardant properties of wood materials by delignification and densification. The densification process eliminates the spaces between the cell walls, leading to a highly compact laminated structure that can block oxygen from infiltrating the material. In addition, an insulating wood char layer self-formed during the burning process obstructs the transport of heat and oxygen diffusion. These synergistic effects contribute to the material's excellent fire-retardant and self-extinguished properties, including a 2.08-fold enhancement in ignition time (t ig ) and 34.6% decrease in maximum heat release rate. Meanwhile, the densified wood shows a more than 82-fold enhancement in compressive strength compared with natural wood after exposure to flame for 90 s, which could effectively prevent the collapse and destruction of wooden structures, and gain precious rescue time when a fire occurs. The facile top-down chemical delignification and densification process enabling both substantially enhances fire-retardant performance and mechanical robustness represents a promising direction toward fire-retardant and high-strength structural materials.

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Section: Introductionmentioning

confidence: 99%

Dense, Self‐Formed Char Layer Enables a Fire‐Retardant Wood Structural Material

Gan

Chen

Wang

et al. 2019

Adv Funct Materials

145

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“…29 As shown in Fig. 4, the SF is coiled around a glass rod to illustrate its good exibility and can also recover the smooth morphology aer winding.…”

Section: 27mentioning

confidence: 95%

Flexible inorganic membranes used as a high thermal safety separator for the lithium-ion battery

Shi¹,

Zhu

Shen

et al. 2018

RSC Adv.

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A flexible SiO 2 porous fiber membrane (SF) is prepared by electrospinning followed by calcination in this work. Compared with an organic substrate separator, the SF used as a separator will be an absolute guarantee of the battery thermal safety. The porosity of the SF is 88.6%, which is more than twice that of a regular PP separator. Hydrophilic SF shows better electrolyte wetting ability and its high porosity enables the SF to absorb 633% liquid electrolyte on average, while the lithium-ion conductivity reaches mS cm À1. The linear sweep voltammogram testing of PP and SF suggested that SF, with great electrochemical stability, can meet the requirements of lithium-ion batteries. The cyclic and rate performances of batteries prepared with SF are improved significantly. Such advantages of the SF, together with its potential in mass production, make the SF a promising membrane for practical applications in secondary lithium-ion batteries.

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“…The FRs in the separator are designed to be released at a certain temperature. For example, Liu et al [36] built a nonwoven electrospun Li-ion battery separator that has thermal-triggered flame-retardant properties. The separator is made of electrospun microfiber that is specially designed with a core-shell structure.…”

Section: Fire Prevention Using Flame Retardantsmentioning

confidence: 99%

“…Meanwhile, the PVDF-HFP will not influence the battery electrochemical reactions. Liu et al [36] claimed that this design provides flame-retarding ability without hindering the battery's performance. When the battery temperature increases to the melting point of PVDF-HFP (160 • C), the encapsulated TPP FR will be released into the electrolyte.…”

Section: Fire Prevention Using Flame Retardantsmentioning

confidence: 99%

Li-Ion Battery Fire Hazards and Safety Strategies

et al. 2018

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Abstract:In the past five years, there have been numerous cases of Li-ion battery fires and explosions, resulting in property damage and bodily injuries. This paper discusses the thermal runaway mechanism and presents various thermal runaway mitigation approaches, including separators, flame retardants, and safety vents. The paper then overviews measures for extinguishing fires, and concludes with a set of recommendations for future research and development.

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Electrospun core-shell microfiber separator with thermal-triggered flame-retardant properties for lithium-ion batteries

Abstract: A novel “smart” separator with thermal-triggered flame-retardant properties for lithium-ion batteries to improve their safety.

Cited by 277 publications

References 45 publications

Dense, Self‐Formed Char Layer Enables a Fire‐Retardant Wood Structural Material

Dense, Self‐Formed Char Layer Enables a Fire‐Retardant Wood Structural Material

Flexible inorganic membranes used as a high thermal safety separator for the lithium-ion battery

Li-Ion Battery Fire Hazards and Safety Strategies

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