Evaporation-induced self-assembled silica colloidal particle-assisted nanoporous structural evolution of poly(ethylene terephthalate) nonwoven composite separators for high-safety/high-rate lithium-ion batteries

Lee, Jung Ran; Won, Ji Hye; Kim, Jong Hun; Kim, Ki Jae; Lee, Sang Young

doi:10.1016/j.jpowsour.2012.05.052

Cited by 58 publications

(32 citation statements)

References 34 publications

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“…Though the Al 2 O 3 nanopowder coating slightly lowers the porosity of the NFs/PET/NFs membrane, the hybrid Al 2 O 3 @NFs/ PET/NFs separator still possesses considerable porosity for retaining sufficient liquid electrolyte. In addition, this result agrees well with Lee's report [16].…”

Section: Morphology and Structuresupporting

confidence: 93%

“…In contrast, Al 2 O 3 @NFs/PET/NFs exhibits superior electrolyte wettability, ascribing to high porosity and abundant electrolyte affinity functional hydroxyl groups of NFs/PET/NFs separator [23], and inherent porous structure and hydrophilicity of the g-Al 2 O coating as an extra. These combined advantages facilitate capillary intrusion of the liquid electrolyte into the electrolytephilic pores in Al 2 O 3 @NFs/PET/NFs [16]. …”

Section: The Wettability Of Separatormentioning

confidence: 99%

“…Thus, Al 2 O 3 @NFs/PET/NFs separator exhibits relatively higher ion conductivity (0.92 mS cm À1 ) compared to that of NFs/PET/NFs (0.88 mS cm À1 ) and PP/PE/PP separator (0.36 mS cm À1 ) on account of its larger thickness and smaller bulk resistance. This excellent lithium-ion transport behavior is expected to improve the discharge C-rate capability of lithium-ion batteries [12,16,[24][25][26][27], due to the high electrolyteaffinity of polar Al 2 O 3 nanoparticles and PVA-co-PE nanofibers and the three-dimensional nanoporous structure of Al 2 O 3 @NFs/PET/ NFs separator [28].…”

Section: Ionic Conductivitymentioning

confidence: 99%

“…Nonwoven separators are promising alternative to commercial polyolefin-based separators due to their high porosity, excellent mechanical and thermal stability, and cost competitiveness [10,16]. However, conventional nonwovens could not be directly applicable for lithium-ion batteries owing to their macro-sized porous structure.…”

Section: Introductionmentioning

confidence: 99%

“…Though high porosity for separators facilitates lithium-ion transport, it may lead to self-discharge and be vulnerable to breakdown at high discharge rates or under vigorous conditions which can cause local lithium dendrite growth [17]. Considerable efforts have been focused on surface modification of nonwoven based separators to tune the porous structure and surface properties, including various ceramic nanoparticle coating, nanofibers coating and cross-linked polymer coating [15,16].…”

Section: Introductionmentioning

confidence: 99%

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High performance hybrid Al2O3/poly(vinyl alcohol-co-ethylene) nanofibrous membrane for lithium-ion battery separator

Liu

Xia

Chen

et al. 2015

Electrochimica Acta

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Section: Morphology and Structuresupporting

confidence: 93%

Section: The Wettability Of Separatormentioning

confidence: 99%

Section: Ionic Conductivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

High performance hybrid Al2O3/poly(vinyl alcohol-co-ethylene) nanofibrous membrane for lithium-ion battery separator

Liu

Xia

Chen

et al. 2015

Electrochimica Acta

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Effective Polysulfide Rejection by Dipole‐Aligned BaTiO₃ Coated Separator in Lithium–Sulfur Batteries

Yim

Han

Park

et al. 2016

Adv Funct Materials

Self Cite

177

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Although the exceptional theoretical specific capacity (1672 mAh g−1) of elemental sulfur makes lithium–sulfur (Li–S) batteries attractive for upcoming rechargeable battery applications (e.g., electrical vehicles, drones, unmanned aerial vehicles, etc.), insufficient cycle lives of Li–S cells leave a substantial gap before their wide penetration into commercial markets. Among the key features that affect the cyclability, the shuttling process involving polysulfides (PS) dissolution is most fatal. In an effort to suppress this chronic PS shuttling, herein, a separator coated with poled BaTiO3 or BTO particles is introduced. Permanent dipoles that are formed in the BTO particles upon the application of an electric field can effectively reject PS from passing through the separator via electrostatic repulsion, resulting in significantly improved cyclability, even when a simple mixture of elemental sulfur and conductive carbon is used as a sulfur cathode. The coating of BTO particles also considerably suppresses thermal shrinkage of the poly(ethylene) separator at high temperatures and thus enhances the safety of the cell adopting the given separator. The incorporation of poled particles can be universally applied to a wide range of rechargeable batteries (i.e., metal‐air batteries) that suffer from cross‐contamination of charged species between both electrodes.

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Construction of porous coating layer and electrochemical performances of the corresponding modified polyethylene separators for lithium ion batteries

Fang

Shi

et al. 2014

J of Applied Polymer Sci

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To effectively improve the affinity of polyethylene (PE) separators with liquid electrolyte without causing a serious pore blockage and to develop a more suitable technology for the industrial production process, porous polyvinylidene fluoride (PVDF) layer‐coated PE separators are prepared by the dip‐coating method followed by a dry‐cast process. Different from previous investigations, a less volatile solvent and a relatively volatile nonsolvent are used to yield a preferable pore structure. A brief introduction on the pore formation mechanism during the dry‐cast process is provided. The pore structure of coating layer is found to be successfully controlled by changing evaporation temperature, nonsolvent content, and PVDF concentration. The porous PVDF coating layer‐modified separators show better affinity with liquid electrolyte and thermal stability. Especially, the ionic conductivity of the modified separator/liquid electrolyte system with a suitable porous coating layer on the separator could reach two times as that of PE separator/liquid electrolyte system, and the cell assembled with modified PE separator shows better cycle performances. This modification process is proved to be a facile, controllable, and effective method for PE separator modification. Meanwhile, this work could provide some theoretical and technical guidance for the production process. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41036.

show abstract

Evaporation-induced self-assembled silica colloidal particle-assisted nanoporous structural evolution of poly(ethylene terephthalate) nonwoven composite separators for high-safety/high-rate lithium-ion batteries

Cited by 58 publications

References 34 publications

High performance hybrid Al2O3/poly(vinyl alcohol-co-ethylene) nanofibrous membrane for lithium-ion battery separator

High performance hybrid Al2O3/poly(vinyl alcohol-co-ethylene) nanofibrous membrane for lithium-ion battery separator

Effective Polysulfide Rejection by Dipole‐Aligned BaTiO₃ Coated Separator in Lithium–Sulfur Batteries

Construction of porous coating layer and electrochemical performances of the corresponding modified polyethylene separators for lithium ion batteries

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Evaporation-induced self-assembled silica colloidal particle-assisted nanoporous structural evolution of poly(ethylene terephthalate) nonwoven composite separators for high-safety/high-rate lithium-ion batteries

Cited by 58 publications

References 34 publications

High performance hybrid Al2O3/poly(vinyl alcohol-co-ethylene) nanofibrous membrane for lithium-ion battery separator

High performance hybrid Al2O3/poly(vinyl alcohol-co-ethylene) nanofibrous membrane for lithium-ion battery separator

Effective Polysulfide Rejection by Dipole‐Aligned BaTiO3 Coated Separator in Lithium–Sulfur Batteries

Construction of porous coating layer and electrochemical performances of the corresponding modified polyethylene separators for lithium ion batteries

Contact Info

Product

Resources

About

Effective Polysulfide Rejection by Dipole‐Aligned BaTiO₃ Coated Separator in Lithium–Sulfur Batteries