Electrospun polyacrylonitrile nanofibrous membranes with varied fiber diameters and different membrane porosities as lithium-ion battery separators

Ma, Xiaojing; Kolla, Praveen; Yang, Ruidong; Wang, Zhao; Zhao, Yong; Smirnova, Alevtina; Fong, Hao

doi:10.1016/j.electacta.2017.03.205

Cited by 111 publications

(40 citation statements)

References 27 publications

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“…However, the practical application of PVDF separators is limited thus far by their relatively poor mechanical properties and unsatisfactory thermal stability. As an alternative, polyacrylonitrile (PAN) possesses better thermal stability with a melting point of 320 °C . PAN separators can suppress the formation of lithium dendrites due to their high modulus of 3–4 GPa .…”

Section: Designer Separators For Electrochemical Functionmentioning

confidence: 99%

Design Principles of Functional Polymer Separators for High‐Energy, Metal‐Based Batteries

Zhang

Qian

et al. 2017

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Next-generation rechargeable batteries that offer high energy density, efficiency, and reversibility rely on cell configurations that enable synergistic operations of individual components. They must also address multiple emerging challenges,which include electrochemical stability, transport efficiency, safety, and active material loss. The perspective of this Review is that rational design of the polymeric separator, which is used widely in rechargeable batteries, provides a rich set of opportunities for new innovations that should enable batteries to meet many of these needs. This perspective is different from the conventional view of the polymer separator as an inert/passive unit in a battery, which has the sole function to prevent direct contact between electrically conductivecomponents that form the battery anode and cathode. Polymer separators, which serve as the core component in a battery, bridge the electrodes and the electrolyte with a large surface contact that can be utilized to apply desirable functions. This Review focuses specifically on recent advances in polymer separator systems, with a detailed analysis of several embedded functional agents that are incorporated to improve mechanical robustness, regulate ion and mass transport, and retard flammability. The discussion is also extended to new composite separator concepts that are designated traditionally as polymer/gel electrolytes.

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Section: Designer Separators For Electrochemical Functionmentioning

confidence: 99%

Design Principles of Functional Polymer Separators for High‐Energy, Metal‐Based Batteries

Zhang

Qian

et al. 2017

Small

180

125

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“…In biomedical applications, recent work has utilized electrospun polycaprolactone/gelatin composite materials for guided bone regeneration, drug delivery in soft tissue, and wound dressings based on biodegradable polymers such as polyetherimide, polylactic acid, and others . In electrochemistry, electrospun materials are being employed in a range of devices, such as lithium‐ion battery separators . These mats can also be carbonized to produce electrically conductive materials for use as Li‐ion battery anodes, and gas diffusion layers in polymer electrolyte membrane fuel cells .…”

Section: Introductionmentioning

confidence: 99%

Insights into the Effect of Structural Heterogeneity in Carbonized Electrospun Fibrous Mats for Flow Battery Electrodes by X‐Ray Tomography

Kok

Jervis

Brett

et al. 2018

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Electrospun custom made flow battery electrodes are imaged in 3D using X-ray computed tomography. A variety of computational methods and simulations are applied to the images to determine properties including the porosity, fiber size, and pore size distributions as well as the material permeability and flow distributions. The simulations are performed on materials before and after carbonization to determine the effect it has in the internal microstructure and material properties. It is found that the deposited fiber size is constantly changing throughout the electrospinning process. The results also show that the surfaces of the fibrous material are the most severely altered during carbonization and that the rest of the material remained intact. Pressure driven flow is modeled using the lattice Boltzmann method and excellent agreement with experimental results is found. The simulations coupled with the material analysis also demonstrate the highly heterogeneous nature of the flow. Most of the flow is concentrated to regions with high porosity while regions with low porosity shield other pores and starve them of flow. The importance of imaging these materials in 3D is highlighted throughout.

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“…Nano‐ and micro‐fibers are ‘spun’ from a polymer‐containing solution onto a target with a large potential difference, typically over 10 kV. The technique has been used to generate materials for lithium‐ion battery separators, supercapacitors, fuel cells, and, recently, RFBs ,. The advantage of using electrospun fibers in these devices is that it allows for small fiber diameters, which increase the specific surface area, and with careful variation of various parameters can allow control of porosity, fiber size and alignment.…”

Section: Introductionmentioning

confidence: 99%

X‐ray Nano Computed Tomography of Electrospun Fibrous Mats as Flow Battery Electrodes

et al. 2018

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Many electrochemical energy storage and conversion devices employ porous media as electrodes, gas diffusion layers or separators. Recently, electrospinning has received significant attention as a way to generate nano‐fibers of polymers with controlled morphology and properties that, once carbonised, can act as conductive and porous media for electrochemical energy devices. The recent advances in X‐ray computed tomography have led the technique to be widely used in the characterisation of energy technologies and porous media as it offers a uniquely non‐destructive insight into the 3D microstructure of materials. Here we present electrospun fibrous mats with uncontrolled, controlled and aligned morphology for use as redox flow battery electrodes and, for the first time, obtain ultra‐high resolution nano‐tomographic X‐ray imaging of the materials using a lab source. The virtual 3D volumes enable extraction of parameters that would not be possible via other characterisation routes.

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Electrospun polyacrylonitrile nanofibrous membranes with varied fiber diameters and different membrane porosities as lithium-ion battery separators

Cited by 111 publications

References 27 publications

Design Principles of Functional Polymer Separators for High‐Energy, Metal‐Based Batteries

Design Principles of Functional Polymer Separators for High‐Energy, Metal‐Based Batteries

Insights into the Effect of Structural Heterogeneity in Carbonized Electrospun Fibrous Mats for Flow Battery Electrodes by X‐Ray Tomography

X‐ray Nano Computed Tomography of Electrospun Fibrous Mats as Flow Battery Electrodes

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