Multilayered separator based on porous polyethylene layer, Al2O3 layer, and electro-spun PVdF nanofiber layer for lithium batteries

An, Min-Young; Kim, Hee‐Tak; Chang, Duck-Rye

doi:10.1007/s10008-014-2412-4

Cited by 42 publications

(19 citation statements)

References 27 publications

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“…The slope of lines indicates a Warburg diffusion process, and the resistances of different separators are determined by the intersection of the spectrum line and x‐axis. The bulk resistances of the Celgard PP, PI nonwoven, PI‐2, and PI‐4 separators are 2.1, 0.7, 1.1, and 1.2 Ω, respectively. The ionic conductivities of the separators with liquid electrolyte are evaluated to be 0.59, 2.2, 1.43, and 1.31 mS cm −1 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Robust Polyimide Nanofibrous Membrane with Bonding Microstructures Fabricated via Dipping Process for Lithium‐Ion Battery Separators

et al. 2019

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Herein, an innovative polyimide (PI) nanofibrous membrane with unique bonding microstructures is fabricated for lithium‐ion battery (LIB) separator application via an elaborately designed dipping method using polyamic acid (PAA) glue as the joint binder. Furthermore, the bonding degree can be easily adjusted by simply varying the concentration of PAA glue. The introduction of bonding microstructures into the PI nanofibrous nonwoven membrane leads to the formation of tough 3D networks between PI nanofibers and turns the loose–weak nonwoven membrane to a compact–robust fabric membrane. The tensile strength of the PI nanofibrous membrane is consequently promoted from 5 to 36 MPa, which greatly improves the feasibility of the membrane for the LIB winding process and the safety of the LIB during long‐term running. The cells using the bonded PI nanofibrous separators exhibit an excellent cycling stability and rate capability, manifesting 80.3% capacity retention at 5 C (i.e., 128.5 mAh g−1) and can run stably at a high temperature of 120 °C. Herein, the prepared PI nanofibrous membranes with such bonding microstructures are demonstrated, which have the potential to be advanced separators for secure and high‐power LIBs.

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Section: Resultsmentioning

confidence: 99%

Robust Polyimide Nanofibrous Membrane with Bonding Microstructures Fabricated via Dipping Process for Lithium‐Ion Battery Separators

et al. 2019

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“…The most commonly used surface modification is the use of PVDF and its copolymers for the coating of other polymers such as polyethylene porous separators. Thus, the coating of PE with a Al 2 O 3 ceramic layer and a PVDF electrospun nanofiber layer leads to enhanced electrolyte uptake, improved capacity discharge, and cycle life [ 55 ]. Similarly, a PDA coating on PVDF improves hydrophilicity, enhancing electrolyte uptake and ionic conductivity of the separator [ 31 ].…”

Section: Poly(vinylidene Fluoride) and Its Copolymersmentioning

confidence: 99%

Recent Advances in Poly(vinylidene fluoride) and Its Copolymers for Lithium-Ion Battery Separators

et al. 2018

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The separator membrane is an essential component of lithium-ion batteries, separating the anode and cathode, and controlling the number and mobility of the lithium ions. Among the polymer matrices most commonly investigated for battery separators are poly(vinylidene fluoride) (PVDF) and its copolymers poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE), poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), and poly(vinylidene fluoride-cochlorotrifluoroethylene) (PVDF-CTFE), due to their excellent properties such as high polarity and the possibility of controlling the porosity of the materials through binary and ternary polymer/solvent systems, among others. This review presents the recent advances on battery separators based on PVDF and its copolymers for lithium-ion batteries. It is divided into the following sections: single polymer and co-polymers, surface modification, composites, and polymer blends. Further, a critical comparison between those membranes and other separator membranes is presented, as well as the future trends on this area.

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“…More recently, surface coatings based on organic polymers, occasionally combined with inorganic ceramic fillers, such as SiO 2 , Al 2 O 3 , TiO 2 , and ZrO 2 , have attracted substantial attention because of their simplicity, effectiveness, and processing versatility [11][12][13][14][15][16]. Jung et al [12] coated a thin Al 2 O 3 layer on the PP separator by atomic layer deposition technology.…”

Section: Introductionmentioning

confidence: 98%

Hollow mesoporous silica sphere-embedded composite separator for high-performance lithium-ion battery

Xiao

Wang

et al. 2016

J Solid State Electrochem

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A high-performance composite separator based on hollow mesoporous silica spheres, poly(vinylidene fluorideco-hexafluoropropylene) (PVdF-HFP), and poly(ethylene terephthalate) nonwoven was explored as lithium-ion battery separator via a dip coating technique followed by a phase separation wet process. Systematical investigations including morphology characterization, porosity measurement, electrolyte wettability, thermal shrinkage testing, and cell performance examination are carried out. It is demonstrated that the unique mesoporous structures of silica spheres endow the composite separator with well-defined microporous structure. Owing to the preferable microstructure and relatively polar constituents, the composite separator exhibits higher porosity, superior electrolyte wettability, and outstanding thermal stability. Based on the above advantages, the composite separator shows better electrochemical performances, such as the discharge C-rate capability and cycling performance, as compared to the commercialized PE separator. This research presents a simple approach to prepare high-performance separator, which is demonstrated to be a good candidate for lithium-ion batteries.

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Multilayered separator based on porous polyethylene layer, Al2O3 layer, and electro-spun PVdF nanofiber layer for lithium batteries

Cited by 42 publications

References 27 publications

Robust Polyimide Nanofibrous Membrane with Bonding Microstructures Fabricated via Dipping Process for Lithium‐Ion Battery Separators

Robust Polyimide Nanofibrous Membrane with Bonding Microstructures Fabricated via Dipping Process for Lithium‐Ion Battery Separators

Recent Advances in Poly(vinylidene fluoride) and Its Copolymers for Lithium-Ion Battery Separators

Hollow mesoporous silica sphere-embedded composite separator for high-performance lithium-ion battery

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