Enhanced Wettability of a PTFE Porous Membrane for a High‐Temperature Stable Lithium‐Ion Battery Separator

Guo, Honglian; Li, Mingye; Li, Fan; Zhu, Qizhen; Zhao, Yi; Wang, Feng; Qin, Zhenping

doi:10.1002/ceat.202000218

Cited by 7 publications

(5 citation statements)

References 46 publications

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“…The outstanding chemical resistance and thermal stability of PTFE enhance its excellent performance in high-voltage environments, making it the ideal choice for cathode applications. 50,51 Additionally, PET acts as a supportive layer on the anode, leveraging its mechanical properties and electrical insulating performance. This effectively safeguards against lithium dendrite penetration through the separator, thus preventing battery short-circuiting.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, Janus separators have received much attention in batteries. − In this study, we introduce a Janus poly(ethylene terephthalate) (PET)–polytetrafluoroethylene (PTFE) separator, abbreviated as the PET–PTFE separator, for use in lithium metal batteries. The outstanding chemical resistance and thermal stability of PTFE enhance its excellent performance in high-voltage environments, making it the ideal choice for cathode applications. , Additionally, PET acts as a supportive layer on the anode, leveraging its mechanical properties and electrical insulating performance. This effectively safeguards against lithium dendrite penetration through the separator, thus preventing battery short-circuiting.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the PET–PTFE Separator Pore Structure on the Performance of Lithium Metal Batteries

Li,

Gao,

Duan

et al. 2024

ACS Appl. Mater. Interfaces

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The separator is a crucial component in lithium batteries, as it physically separates the cathode and the anode while allowing ion transfer through the internal channel. The pore structure of the separator significantly influences the performance of lithium batteries, particularly lithium metal batteries. In this study, we investigate the use of a Janus separator composed of poly(ethylene terephthalate) (PET)−polytetrafluoroethylene (PTFE) fibers in lithium metal batteries. This paper presents a comprehensive analysis of the impact of this asymmetric material on the cycling performance of the battery alongside an investigation into the influence of two different substrates on lithiumion deposition behavior. The research findings indicate that when the rigid PET side faces the lithium metal anode and the soft PTFE side faces the cathode, it significantly extends the cycling lifespan of lithium metal batteries, with an impressive 82.6% capacity retention over 2000 cycles. Furthermore, this study demonstrates the versatility of this separator type in lithium metal batteries by assembling the lithium metal electrode with high cathode-loading capacities (4 mA h/ cm 2 ). In conclusion, the results suggest that the design of asymmetric separators can serve as an effective engineering strategy with substantial potential for enhancing the lifespan of lithium metal batteries.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of the PET–PTFE Separator Pore Structure on the Performance of Lithium Metal Batteries

Li,

Gao,

Duan

et al. 2024

ACS Appl. Mater. Interfaces

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“…Polyolefin porous separators have prominent defects such as low compatibility with liquid electrolytes because of their hydrophobicity, which leads to low ionic conductivity and poor rate performance 12,13 . Additionally, polyolefin separators have a weak thermal dimensional stability and high flammability when exposed to high temperatures because of their low melting point 14,15 . The dimensional shrinkage of separators generates a short circuit between the cathodes and anodes, leading to serious safety issues, especially when the batteries used for electric vehicles 16 .…”

Section: Introductionmentioning

confidence: 99%

“…12,13 Additionally, polyolefin separators have a weak thermal dimensional stability and high flammability when exposed to high temperatures because of their low melting point. 14,15 The dimensional shrinkage of separators generates a short circuit between the cathodes and anodes, leading to serious safety issues, especially when the batteries used for electric vehicles. 16 Therefore, it is essential to develop a high-performance separator with excellent thermal stability and prominent compatibility with liquid electrolytes for lithium-ion battery applications.…”

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confidence: 99%

A high thermal stable pre‐oxidized polyacrylonitrile nanofiber separator for lithium‐ion battery

Huang

Wang

2023

J of Applied Polymer Sci

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The separator as a main part of lithium‐ion batteries (LIBs) acts as a primary factor that affects the safety property of the battery. The pre‐oxidized PAN (OPAN) separator as an alternative separator with high temperature resistance was developed through the electrospinning of PAN by thermal stabilization. The prepared OPAN separator showed an exceptional dimensional thermal stabilization, without obvious dimensional shrinkage after treated in the oven at 300°C for 30 min, which improves the safety of LIBs at high temperatures. The OPAN separator had a high porosity and excellent affinity to the electrolyte, along with 351.3% of electrolyte uptake. Furthermore, the ionic conductivity and the interfacial resistance of OPAN separator were 1.63 mS/cm and 881 Ω, better than 0.65 mS/cm and 1463 Ω of commercial Celgard 2400 separator. In addition, the LiFePO4/Li battery assembled with OPAN separator given an outstanding initial discharge specific capacity and coulomb efficiency of 152.1 mAh/g and 97.9% and shown an excellent capacity retention ability of 92.3% after 100 cycles. The battery assembled with OPAN separator exhibits more excellent rate performance than PAN and Celgard 2400 separators at a charge current density of 0.2–3.0 C. It is believed that this excellent separator with such remarkable performances and low cost can be a promising separator candidate for safe LIBs.

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“…The corresponding size and morphology were synthesized to alleviate the capacity decay of LiMn 2 O 4 by controlling the reaction conditions [20]. Octahedral Mn 3 O 4 and LiMn 2 O 4 had the same spinel structure, which could reduce crystal structure changes during high-temperature roasting, facilitate lithium ion disembedding, reduce the effect of lithium-ion disembedding on crystal structure, and improve the high-temperature performance, cycling performance, and gram specific capacity of LiMn 2 O 4 [21,22].…”

Section: Introductionmentioning

confidence: 99%

Study and Property Characterization of LiMn2O4 Synthesized from Octahedral Mn3O4

Wang,

Wang

et al. 2023

Sustainability

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The structure of Mn3O4 with an octahedron structure was similar to that of LiMn2O4, and the lithium manganate prepared with it had good electrochemical performance. During the preparation of octahedron Mn3O4, the effects of the pH regulator, temperature, and reaction pH on its morphology, specific surface area, and other properties were studied in this paper. LiMn2O4 was prepared from Octahedron Mn3O4 obtained by using better technology. The effects of calcination time and temperature on the physicochemical and electrochemical properties of LiMn2O4 were studied. The research results indicated that the optimal synthesis conditions for Mn3O4 were as follows: ammonia water was used as a pH regulator and complexing agent, reaction pH was 8, reaction temperature was 80 °C, reaction time was 12 h, and oxygen flow rate was 3 L∙min−1. The LiMn2O4 synthesized had a good octahedron morphology when the calcination temperature was 800 °C and the calcination time was 10 h. The first discharge-specific capacity was 121.9 mAh∙g−1 at a current density of 0.2 C, the discharge-specific capacity was 114.1 mAh∙g−1 after 100 cycles, and the capacity retention rate was 93.6%. Therefore, the lithium manganate prepared by using octahedron manganous oxide had good electrochemical reversibility and a good application prospect.

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Enhanced Wettability of a PTFE Porous Membrane for a High‐Temperature Stable Lithium‐Ion Battery Separator

Cited by 7 publications

References 46 publications

Influence of the PET–PTFE Separator Pore Structure on the Performance of Lithium Metal Batteries

Influence of the PET–PTFE Separator Pore Structure on the Performance of Lithium Metal Batteries

A high thermal stable pre‐oxidized polyacrylonitrile nanofiber separator for lithium‐ion battery

Study and Property Characterization of LiMn2O4 Synthesized from Octahedral Mn3O4

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