Electrospun PVDF nanofiber web as polymer electrolyte or separator

Choi, Sung‐Seen; Lee, Young Soo; Joo, Chang Whan; Lee, Seung Koo; Park, Jong Kyoo; Han, Kyoo‐Seung

doi:10.1016/j.electacta.2004.03.057

Cited by 262 publications

(113 citation statements)

References 19 publications

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“…The third point is on how to produce such a trilayer separator. Even though we demonstrated this concept by stacking two layers of separators with a metal coating between, it is entirely possible to use only one layer of polymer separator as a substrate to deposit the thin metal layer followed by a porous insulating layer, which can be produced by a variety of coating methods such as solution particle coating 22 , gel electrolyte coating 32 , electrospinning of polymer fibres 33 , and copolymer coating and extraction 34 . The fourth feature is that including a third electrode in the battery to detect short circuits opens up new opportunities in battery management systems for much improved control.…”

Section: Discussionmentioning

confidence: 99%

Improving battery safety by early detection of internal shorting with a bifunctional separator

et al. 2014

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Lithium-based rechargeable batteries have been widely used in portable electronics and show great promise for emerging applications in transportation and wind-solar-grid energy storage, although their safety remains a practical concern. Failures in the form of fire and explosion can be initiated by internal short circuits associated with lithium dendrite formation during cycling. Here we report a new strategy for improving safety by designing a smart battery that allows internal battery health to be monitored in situ. Specifically, we achieve early detection of lithium dendrites inside batteries through a bifunctional separator, which offers a third sensing terminal in addition to the cathode and anode. The sensing terminal provides unique signals in the form of a pronounced voltage change, indicating imminent penetration of dendrites through the separator. This detection mechanism is highly sensitive, accurate and activated well in advance of shorting and can be applied to many types of batteries for improved safety.

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Section: Discussionmentioning

confidence: 99%

Improving battery safety by early detection of internal shorting with a bifunctional separator

et al. 2014

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“…PLA is a biocompatible, biodegradable, and environmentally friendly composite that has the potential for environmental and biomedical applications 16 . PVDF is extensively used for filtration membranes and in rechargeable batteries due to its outstanding chemical resistance and good thermal stability 17 . Nanofibre mats might be of use in plant tissue culture but it is obvious that they cannot be considered to be an alternative to agar or other support matrices for micropropagation 18 , primarily from the cost perspective alone.…”

Section: Introductionmentioning

confidence: 99%

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Bodhipadma¹,

Noichinda²,

Chanunpanich³

et al. 2011

ScienceAsia

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The development of new materials to be used as a substrate for plant tissue culture can lead to substantial advances in biotechnology. Here, mats consisting of a mixture of nonwoven (randomly oriented) and aligned nanofibres were produced by electrospinning solutions of polylactic acid (PLA) and polyvinylidene fluoride (PVDF). They were referred to as PLA4 and PVDF4, respectively. Callus initiation from stem explants of bilimbi (Averrhoa bilimbi L.) and aromatic chilli (Capsicum frutescens L.) occurred on these two types of nanofibre mats floated in liquid Murashige and Skoog (1962) basal medium supplemented with 2 mg/l α-naphthalene acetic acid or 2,4-dichlorophenoxy acetic acid, respectively. After subculturing for 3 weeks, the fresh weight of callus initiated from stem explants of bilimbi was significantly greater by 20% when PVDF4 rather than PLA4 nanofibre mats were used as a support matrix. In contrast, both the fresh and dry weights of callus initiated from stem explants of aromatic chilli were significantly greater by 11% and 50%, respectively, when PLA4 and not PVDF4 nanofibre mats was used. These differences in response to the two types of nanofibre mats were also found in relation to growth of callus of bilimbi and aromatic chilli during subculture. This is the first time electrospun nanofibre mats have been used in plant tissue culture research.

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“…However, the poor mechanical properties of electrospun non-wovens can limit their use for industrial applications, where high stresses and bending are applied during battery assembly. 19 Improvements in membrane mechanical properties have been achieved either throughout thermal annealing of the membrane 20,21 or by the addition of nanoparticles (e.g. metal oxide).…”

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confidence: 99%

Effect of Silica and Tin Oxide Nanoparticles on Properties of Nanofibrous Electrospun Separators

Zaccaria

Fabiani

Cannucciari

et al. 2015

J. Electrochem. Soc.

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Innovative separators able to improve the performance and safety of Li-ion batteries are under investigation to meet the growing demand for large-size and high energy density electrochemical cells. In this work, highly porous nanofibrous Poly(vinylidene fluoride) (PVdF) separators loaded with oxide nanoparticles were produced by electrospinning. Silicon oxide and tin oxide nanoparticles were added to PVdF and membranes were characterized by SEM-EDS and TGA. The effect of nanoparticle addition on electrolyte uptake, mechanical properties and conductivity was investigated and such properties were compared to those of a commercial separator (Celgard 2400). Results showed that a small amount of additive can significantly improve the properties of PVdF electrospun membranes and that the different nanoparticles investigated in this work have different effect on membrane performances. In particular, the addition of SiO 2 increases the rate of electrolyte uptake and the toughness of the electrospun membrane, while the addition of SnO 2 decreases the rate of electrolyte uptake and increases the stiffness of the electrospun membrane. When loaded with nanoparticles, PVdF membranes maintain their insulating character also at high temperature. Nowadays, lithium-ion batteries control electronic device market (e.g. laptops, mobile phones, cameras) due to their high energy density, high efficiency and long cycle life. However, a breakthrough is needed in order to fulfil new requirements of hybrid and electric vehicles and energy storage devices, in terms of costs, better electrochemical performances and safety.

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Electrospun PVDF nanofiber web as polymer electrolyte or separator

Cited by 262 publications

References 19 publications

Improving battery safety by early detection of internal shorting with a bifunctional separator

Improving battery safety by early detection of internal shorting with a bifunctional separator

Untitled

Effect of Silica and Tin Oxide Nanoparticles on Properties of Nanofibrous Electrospun Separators

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