Electrospun PAN membranes toughened and strengthened by TPU/SHNT for high-performance lithium-ion batteries

Tang, Liping; Wu, Yankang; He, Dalin; Lei, Zhiqiang; Liu, Naiqiang; He, Yu; Guzman, Manuel Reyes De; Chen, Jian

doi:10.1016/j.jelechem.2023.117181

Cited by 17 publications

(10 citation statements)

References 42 publications

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“…11 Severe thermal bursting will dramatically enhance battery operating temperature, and when the temperature polyolefin separator will further shrink or even melt as a result of the explosion. 12 Therefore, commercial polyolefin separators have thermal safety problems when used. The development of a lithium-ion battery separator with excellent thermal stability is key to solving the safety problem.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the short circuit incident accelerates the uncontrollable chemical reaction, and more heat will be released . Severe thermal bursting will dramatically enhance battery operating temperature, and when the temperature exceeds the melting point (PP about 165 °C, PE about 135 °C), the polyolefin separator will further shrink or even melt as a result of the explosion . Therefore, commercial polyolefin separators have thermal safety problems when used.…”

Section: Introductionmentioning

confidence: 99%

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Heat-Resistant Lithium-Ion-Battery Separator Using Synchronous Thermal Stabilization/Imidization

Yu,

Chen,

Jin

et al. 2024

ACS Appl. Polym. Mater.

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Separators significantly impact the safety and electrochemical properties of lithium-ion batteries (LIBs). However, the commonly used microporous polyolefin-based separators encounter inferior thermal stability and electrolyte wettability. Herein, a heat-resistant porous preoxidized polyacrylonitrile/ polyimide (OPAN/PI) composite nanofiber separator is successfully fabricated through synchronous thermal stabilization/imidization based on a polyacrylonitrile/polyamide acid (PAN/PAA) nanofiber membrane. The incorporation of PI significantly enhances the separator tensile strength by 79.89%, reaching 6.26 MPa. Furthermore, this hybrid separator exhibits splendid thermal dimensional stability (no shrinkage observed at 300 °C for 30 min) and flame-retardant performances, ensuring battery safety. The OPAN/PI separator demonstrates high porosity (78.4%), excellent electrolyte uptake (511.3%), and superior electrolyte wettability because of the intrinsic polar groups and porous structure, leading to enhanced ionic conductivity (1.853 mS/cm) and reduced interfacial resistance (188.4 Ω) compared to the Celgard separator. Furthermore, the LiFePO 4 /Li battery utilizing the OPAN/PI separator shows an admirable initial discharge specific capacity of 150.4 mAh g −1 and a surprising capacity retention ability of 101.0% after 100 cycles at 1C. Therefore, the OPAN/PI separator has great potential as an alternative separator for high-safety LIBs.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Heat-Resistant Lithium-Ion-Battery Separator Using Synchronous Thermal Stabilization/Imidization

Yu,

Chen,

Jin

et al. 2024

ACS Appl. Polym. Mater.

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“…This can be achieved through various methods, including coaxial electrospinning, multijet electrospinning, wet spinning, and in situ polymerization. In a study by Tang et al, 20 a composite blend of TPU, PAN, and surface‐modified halloysite nanotube was electrospun to create a conductive membrane tailored for high‐performance lithium‐ion batteries. The resultant membrane exhibited a maximum strain of approximately 45% and a tensile strength of 28.5 MPa.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of in situ polymerized polyaniline‐based functional nanofibrous structures for flexible electromechanical devices

Khedewy,

Abd El‐Baky,

Hassan

et al. 2024

Polymers for Advanced Techs

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Recently, flexible electromechanical devices (EMDs) emerged as alternatives to rigid electronics, promoting polymeric materials over traditional semiconductors. This study develops EMDs using conductive nanofibrous membranes of thermoplastic polyurethane (TPU), polyaniline (PANI), and multi‐walled carbon nanotubes (MWCNTs) in various structures. The fabrication technique included the combination of electrospinning and in situ polymerization to create random and aligned conductive membranes. Morphological, mechanical, thermomechanical, and electrical characterizations were conducted to assess their potential in EMDs applications. Mechanical testing revealed that, in comparison to aligned pure TPU mats, aligned TPU/PANI and TPU/MWCNTs/PANI membranes exhibited maximum strains of 26% and 19%, respectively. Meanwhile, randomly oriented mats, TPU/PANI and TPU/MWCNTs/PANI demonstrated maximum strains of 18% and 27%, respectively. Moreover, incorporating PANI and/or MWCNTs increased the Young's modulus. Thermogravimetric analysis showed thermal stability up to 250°C for all mats, with TPU/PANI mats demonstrating superior stability. Dynamic mechanical analysis revealed that PANI incorporation increased the storage modulus from 119 and 180 MPa to 2012 and 1367 MPa for aligned and random mats, respectively, compared with pure TPU mats. The combination of MWCNTs and PANI yielded moduli of 1501 and 1096 MPa, respectively. All conductive mats exhibited symmetric ohmic behavior, with conductivities varying based on orientation and composition. Specifically, TPU/PANI and TPU/MWCNTs/PANI mats exhibited conductivities of 0.83 and 1.78 S/cm for aligned mats, and 0.35 and 0.67 S/cm for random mats, respectively. Pure TPU, on the other hand, displayed a conductivity of 1.8 × 10−10 S/cm, indicating a significantly lower conductivity compared with the other mats.

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“…Polyurethane (PU) is synthesized from polyisocyanate and polyols, with excellent mechanical properties including high strength and good toughness. Various LIB separators containing PU have been reported [36,37]. Tang et al [36] used PU to prepare nanofiber separators with elevated strength and toughness for the safety of batteries, which exhibited better tensile strength than PAN separators.…”

Section: Introductionmentioning

confidence: 99%

“…Various LIB separators containing PU have been reported [36,37]. Tang et al [36] used PU to prepare nanofiber separators with elevated strength and toughness for the safety of batteries, which exhibited better tensile strength than PAN separators. Chen et al [37] used the PAN/PU nanofiber membrane as the substrate of LIB separators, which provided an outstanding mechanical strength that could meet the need for practical application in LIBs.…”

Section: Introductionmentioning

confidence: 99%

Batch Fabrication of Electrospun PAN/PU Composite Separators for Safe Lithium-Ion Batteries

Ding,

2023

Batteries

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As an important element of lithium-ion batteries (LIBs), the separator plays a critical role in the safety and comprehensive performance of the battery. Electrospun nanofiber separators have a high porosity and good electrolyte affinity, which are favorable to the transference of lithium ions. In this paper, the batch preparation of polyacrylonitrile (PAN)-based nanofiber separators are obtained via spherical section free surface electrospinning (SSFSE). Introducing an appropriate amount of polyester polyurethane (PU) can effectively enhance the mechanical property of PAN nanofiber separators and help the separators resist the external force extrusion. The results show that when PAN:PU = 8:2, the porosity and electrolyte uptake rate of the composite nanofiber separator (PAN-2) are 62.9% and 643.3%, respectively, exhibiting a high ionic conductivity (1.90 mS/cm). Additionally, the coin battery assembled with PAN-2 as a separator (LiFePO4/PAN-2/lithium metal) shows good cycling performance and good rate performance, with a capacity retention rate of 93.9% after 100 cycles at 0.5 C, indicating that the battery with PAN-2 has a good application potential in advanced energy storage.

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Electrospun PAN membranes toughened and strengthened by TPU/SHNT for high-performance lithium-ion batteries

Cited by 17 publications

References 42 publications

Heat-Resistant Lithium-Ion-Battery Separator Using Synchronous Thermal Stabilization/Imidization

Heat-Resistant Lithium-Ion-Battery Separator Using Synchronous Thermal Stabilization/Imidization

Fabrication of in situ polymerized polyaniline‐based functional nanofibrous structures for flexible electromechanical devices

Batch Fabrication of Electrospun PAN/PU Composite Separators for Safe Lithium-Ion Batteries

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