Shutdown-functionalized nonwoven separator with improved thermal and electrochemical properties for lithium-ion batteries

Kim, Youngkwon; Lee, Won-Yeol; Kim, Ki Jae; Yu, Ji‐Sang; Kim, Young‐Jun

doi:10.1016/j.jpowsour.2015.11.106

Cited by 65 publications

(32 citation statements)

References 25 publications

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“…The DSC analysis of different membranes (Figure c) indicated that the melting points ( T m ) of pure PLLA and CEC/CNF/PLLA membranes were approximately 152.6 and 153.2 °C, respectively. Because cellulosic materials exhibit excellent thermal dimensional stability up to 244 °C, CEC/CNF/PLLA membranes are provided with great potential for shutdown functionality near 153.2 °C . Indeed, benefiting from the melting of PLLA, the shutdown occurred near 153 °C, as demonstrated by AC impedance spectra (Figure d).…”

Section: Resultsmentioning

confidence: 98%

“…As the temperature increased to 153 °C, OCV remained basically stable, demonstrating that the melting of PLLA cannot directly lead to an internal short‐circuit because of the stable host. However, a remarkable fluctuation occurred between 180 °C and 195 °C, and OCV swiftly decreased to zero near 200 °C, which was mainly because of a chemical reaction between the GPEs and an active electrode at high temperature …”

Section: Resultsmentioning

confidence: 99%

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Synergistically Suppressing Lithium Dendrite Growth by Coating Poly‐l‐Lactic Acid on Sustainable Gel Polymer Electrolyte

Wang

et al. 2019

Energy Tech

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Lithium (Li) metal batteries are promising candidates in next‐generation high‐power energy storage devices. However, Li dendrite growth induces great safety issues. Herein, inspired by the high electrolyte uptake, high polarity of the cellulose derivative, and excellent mechanical properties of poly‐l‐lactic acid (PLLA), a sustainable multifunctional gel polymer electrolyte (GPE) through coating a thin PLLA film on the natural polymer is proposed for Li dendrite suppression and cycling stability improvement. In addition, PLLA film coating can also enhance the thermal stability and interfacial interaction between the PLLA‐coated GPEs and Li metal, thus improving the safety of the batteries. Due to these unique beneficial features, the green GPEs enable stable cycling of the Li metal anode with an enhanced Li+ transference number and coulombic efficiency during extended cycles and increases the lifetime by inhibiting short‐circuit failures even under a high energy density and extensive Li metal deposition.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Synergistically Suppressing Lithium Dendrite Growth by Coating Poly‐l‐Lactic Acid on Sustainable Gel Polymer Electrolyte

Wang

et al. 2019

Energy Tech

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“…More importantly, the microstructure with a fine uniform distribution of voids enhanced the lithium ion diffusion capacity and tortuosity of the membrane micropores and reduced the mechanical micro-short circuit in the circulation. Thus, it can be concluded that the Al 2 O 3 /PPTA-coated PE membrane is a promising membrane separator for LIBs with improved electrochemical performance [32,33,34,35].…”

Section: Resultsmentioning

confidence: 99%

Water-Dispersed Poly(p-Phenylene Terephthamide) Boosting Nano-Al2O3-Coated Polyethylene Separator with Enhanced Thermal Stability and Ion Diffusion for Lithium-Ion Batteries

et al. 2019

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Polyethylene (PE) membranes coated with nano-Al2O3 have been improved with water-dispersed poly(p-phenylene terephthamide) (PPTA). From the scanning electron microscope (SEM) images, it can be seen that a layer with a honeycombed porous structure is formed on the membrane. The thus-formed composite separator imbibed with the electrolyte solution has an ionic conductivity of 0.474 mS/cm with an electrolyte uptake of 335%. At 175 °C, the assembled battery from the synthesized composite separator explodes at 3200 s, which is five times longer than the battery assembled from an Al2O3-coated polyethylene (PE) membrane. The open circuit voltage of the assembled battery using a composite separator drops to zero at 600 s at an operating temperature of 185 °C, while the explosion of the battery with Al2O3-coated PE occurs at 250 s. More importantly, the interface resistance of the cell assembled from the composite separator decreases to 65 Ω. Hence, as the discharge rate increases from 0.2 to 1.0 C, the discharge capacity of the battery using composite separator retains 93.5%. Under 0.5 C, the discharge capacity retention remains 99.4% of its initial discharge capacity after 50 charge–discharge cycles. The results described here demonstrate that Al2O3/PPTA-coated polyethylene membranes have superior thermal stability and ion diffusion.

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“…Kim et al. successfully made a shutdown‐functionalized nonwoven separator (SFNS) by coating polyethylene on the surface of nonwoven PET separators with an average diameter of 0.5–2 µm, a thickness of 15–22 µm and a porosity of 20 %. Furthermore, Zhu et al.…”

Section: Type Of Separatorsmentioning

confidence: 99%

Separator Membranes for High Energy‐Density Batteries

et al. 2018

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Rechargeable lithium-ion, lithium-sulfur, zinc-air, and redox-flow batteries are the most anticipated multipurpose platforms for future generations of electric vehicles, consumer devices, and portable electronics because of their high-energy density and cost-effective electrochemical energy storage. Over the past decades, a variety of novel separator membranes and electrolytes have been developed to improve rechargeable battery performance while not thoroughly addressing the issue of flammability, safety, and low cycling stability of high-energy-density batteries. This comprehensive review mainly underlines the optimization and modification of porous membranes for battery separator applications, covering four significant types: microporous separators, nonwoven mat separators, polymer electrolyte membranes, and composite membrane separators. Furthermore, the present trends in material selection for batteries are reviewed, and different choices of cathode, anode, separator, and electrolyte materials are discussed, which will also serve as key components to boost the development of next-generation rechargeable batteries.

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Shutdown-functionalized nonwoven separator with improved thermal and electrochemical properties for lithium-ion batteries

Cited by 65 publications

References 25 publications

Synergistically Suppressing Lithium Dendrite Growth by Coating Poly‐l‐Lactic Acid on Sustainable Gel Polymer Electrolyte

Synergistically Suppressing Lithium Dendrite Growth by Coating Poly‐l‐Lactic Acid on Sustainable Gel Polymer Electrolyte

Water-Dispersed Poly(p-Phenylene Terephthamide) Boosting Nano-Al2O3-Coated Polyethylene Separator with Enhanced Thermal Stability and Ion Diffusion for Lithium-Ion Batteries

Separator Membranes for High Energy‐Density Batteries

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