Poly(ether ether ketone) Conferred Polyolefin Separators with High Dimensional Thermal Stability for Lithium-Ion Batteries

Liu, Yuhan; Zhang, Zijian; Du, Xiaoqiang; Wang, Yuliang; Guo, Xiaohui; Yu, Meng-Xuan; Liu, Baijun; Hu, Wei; Shen, Li; Lu, Yunfeng; Zhu, Guangshan

doi:10.1021/acsami.3c05336

Cited by 7 publications

(1 citation statement)

References 24 publications

(38 reference statements)

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“…More importantly, they cannot effectively meet the requirements of the rapid charging and discharging of high-power batteries because of their low porosity and poor electrolyte wettability, and, thus, the safety and cycle life of the batteries are affected. Many efforts have been made to address these issues affecting polyolefin separators, such as grafting polar functional groups [4,5] and coating organic polymers [6,7] and inorganic particles [8,9] on the surface, thereby improving their electrolyte wettability and thermal stability. In addition to the surface modification based on polyolefin separators, a variety of novel materials, such as polyvinylidene fluoride (PVDF) [10,11], polyacrylonitrile (PAN) [12,13], polyimide (PI) [14,15], or cellulose [16,17], have been built into separators via different methods, including electrospinning, phase separation, vacuum filtration, freeze-drying, etc.…”

Section: Introductionmentioning

confidence: 99%

Crosslinked PVA/Citric Acid Nanofibrous Separators with Enhanced Mechanical and Thermal Properties for Lithium-Ion Batteries

Cai,

Liang,

et al. 2023

Batteries

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Electrospinning polyvinyl alcohol (PVA) nanofibrous membranes have gained increased attention for their uses as separators for lithium-ion batteries (LIBs) due to their high porosity and excellent electrolyte wettability, but their poor mechanical and thermal properties have limited their further development. In this work, a crosslinked PVA composite separator (PVA/CA-H) was first prepared via the electrospinning of the PVA and citric acid (CA) mixed solution and then the heating of the nanofibrous membrane, and the effects of the amount of CA on the structure and performance of the PVA/CA-H separator were investigated. The hydroxyl group of PVA and the carboxyl group of CA were crosslinked under the heat treatment, resulting in a slight reduction in the porosity and pore size of the composite separator compared to pure PVA, and to compensate for this issue, the mechanical strengths, as well as the thermal dimensional stability of the PVA/CA-H separator, were significantly improved. Meanwhile, the PVA/CA-H separator exhibited good electrolyte uptake (158.1%) and high ionic conductivity (1.63 mS cm−1), and, thus, the battery assembled with the PVA/CA-H separator exhibited a capacity retention of 96.3% after 150 cycles at 1 C. These features mean that the crosslinked PVA composite separator can be considered as a prospective high-safety and high-performance separator for LIBs.

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Section: Introductionmentioning

confidence: 99%

Crosslinked PVA/Citric Acid Nanofibrous Separators with Enhanced Mechanical and Thermal Properties for Lithium-Ion Batteries

Cai,

Liang,

et al. 2023

Batteries

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Lignin Derived Ultrathin All‐Solid Polymer Electrolytes with 3D Single‐Ion Nanofiber Ionic Bridge Framework for High Performance Lithium Batteries

Liu,

Wang,

Yang

et al. 2024

Advanced Materials

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Solid‐state lithium batteries are promising candidates for the next generation high security and high performance batteries. Here, the lignin derived ultra‐thin all‐solid composite polymer electrolytes (CPEs) with a thickness of only 13.2 μm, which possessed three dimensional nanofiber ionic bridge networks composed of single‐ion lignin based lithium (L‐Li) and poly(vinylidene fluoride‐co‐hexafluoropropylene) (PVDF‐HFP) as the framework, and poly(ethylene oxide)/lithium bis(trifluoromethanesulfonyl)imide (PEO/LiTFSI) as the filler, was obtained through electrospinning/spraying and hot‐pressing process. The obtained CPE presented high ionic conductivity of 1.3×10−4 S cm−1, excellent oxidative stability of 4.7 V, and satisfactory tensile strength of up to 9.30 MPa. The Li||Li symmetric cell assembled with the CPE can stably cycle more than 6500 h under 0.5 mA cm−2 with little Li dendrites growth. Moreover, the assembled Li||CPE||LiFePO4 cells can stably cycle over 700 cycles at 0.2 C with a super high initial discharge capacity of 158.5 mAh g−1 at room temperature, and a favorable capacity of 123 mAh g−1 at ‐20 °C for 250 cycles, and Li||CPE|| NCM can also stably cycle more than 70 cycles with a favorable discharge capacity of 132.4 mAh g−1 at 0.2 C and 30 °C. The excellent electrochemical performance was mainly attributed to the reason that the nanofiber ionic bridge network can afford uniformly dispersed single‐ion L‐Li through electrospinning, which synergized with the LiTFSI well dispersed in PEO to form abundant and efficient three dimensional Li+ transfer channels. Furthermore, the ultra‐thin CPE can be compactly attached to the lithium anode, and provided a shorter ion transmission distance between the electrodes, inducing uniform deposition of Li+ at the interface, and inhibiting the lithium dendrites. This work provided a promising strategy to achieve ultra‐thin biobased electrolytes with high tensile strength and electrochemical performance for solid‐state LIBs.This article is protected by copyright. All rights reserved

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A Polyvinylidene Fluoride‐Hexafluoropropylene (PVDF‐HFP)/Carboxylated g‐C₃N₄ Composite Separator for High‐Performance Lithium‐Ion Batteries

Xue,

Wang,

Yang

et al. 2024

ChemistrySelect

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Polyvinylidene fluoride‐hexafluoropropylene (PVDF‐HFP) is a standard electrolyte membrane and binder material for lithium‐ion batteries (LIBs) because of the benefits of membrane formation and strong mechanical properties. Still, its use is limited due to unavoidable defects such as high crystallinity and poor electrochemical performance. In this paper, a larger specific surface area and three‐dimensional (3D) permeable lamellae carboxylated g‐C3N4 (HCN) were successfully prepared by HNO3 and introduced into the PVDF‐HFP to obtain a high‐performance composite separator. The wettability and electrolyte absorption of PVDF‐HFP separator can be improved through the carboxylated HCN. More crucially, because PVDF‐HFP has several active sites and low crystallinity, adding HCN can greatly increase the ionic conductivity of separators. The ionic conductivity of PH‐HCN at 25 °C is 0.52 S cm−1, 4.7 times higher than the initial PVDF‐HFP membrane, and the oxidation potential can reach 4.8 V. The assembled lithium‐ion batteries half‐cell has a capacity of 71 % at a 5 C rate and 94 % after 400 cycles at a 2 C rate. Therefore, the improved separator has the potential to be applied to high‐performance LIBs.

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Poly(ether ether ketone) Conferred Polyolefin Separators with High Dimensional Thermal Stability for Lithium-Ion Batteries

Cited by 7 publications

References 24 publications

Crosslinked PVA/Citric Acid Nanofibrous Separators with Enhanced Mechanical and Thermal Properties for Lithium-Ion Batteries

Crosslinked PVA/Citric Acid Nanofibrous Separators with Enhanced Mechanical and Thermal Properties for Lithium-Ion Batteries

Lignin Derived Ultrathin All‐Solid Polymer Electrolytes with 3D Single‐Ion Nanofiber Ionic Bridge Framework for High Performance Lithium Batteries

A Polyvinylidene Fluoride‐Hexafluoropropylene (PVDF‐HFP)/Carboxylated g‐C₃N₄ Composite Separator for High‐Performance Lithium‐Ion Batteries

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Poly(ether ether ketone) Conferred Polyolefin Separators with High Dimensional Thermal Stability for Lithium-Ion Batteries

Cited by 7 publications

References 24 publications

Crosslinked PVA/Citric Acid Nanofibrous Separators with Enhanced Mechanical and Thermal Properties for Lithium-Ion Batteries

Crosslinked PVA/Citric Acid Nanofibrous Separators with Enhanced Mechanical and Thermal Properties for Lithium-Ion Batteries

Lignin Derived Ultrathin All‐Solid Polymer Electrolytes with 3D Single‐Ion Nanofiber Ionic Bridge Framework for High Performance Lithium Batteries

A Polyvinylidene Fluoride‐Hexafluoropropylene (PVDF‐HFP)/Carboxylated g‐C3N4 Composite Separator for High‐Performance Lithium‐Ion Batteries

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A Polyvinylidene Fluoride‐Hexafluoropropylene (PVDF‐HFP)/Carboxylated g‐C₃N₄ Composite Separator for High‐Performance Lithium‐Ion Batteries