Nylon-Based Composite Gel Membrane Fabricated via Sequential Layer-by-Layer Electrospinning for Rechargeable Lithium Batteries with High Performance

Polymers
Sainan QinYuping Wu

Abstract

With the raw materials of poly(vinylidene-co-hexafluoropropylene) (P(VDF-HFP)) and polyamide 6 (PA6, nylon 6), a sandwich-structured composite membrane, PA6/P(VDF-HFP)/PA6, is fabricated via sequential layer-by-layer electrospinning. The nylon-based composite exhibits high absorption to organic liquid electrolyte (270 wt%) owing to its high porosity (90.35%), good mechanical property (17.11 MPa), and outstanding shut-down behavior from approximately 145 to 230 °C. Moreover, the dimensional shrink of a wet PA6 porous membrane immersed into liquid electrolyte is cured due to the existence of the P(VDF-HFP) middle layer. After swelling by the LiPF6-based organic liquid electrolyte, the obtained PA6/P(VDF-HFP)/PA6-based gel polymer electrolytes (GPE) shows high ionic conductivity at room temperature (4.2 mS cm-1), a wide electrochemical stable window (4.8 V), and low activation energy for Li+ ion conduction (4.68 kJ mol-1). Benefiting from the precise porosity structure made of the interlaced electrospinning nanofibers and the superior physicochemical properties of the nylon-based composite GPE, the reversible Li+ ion dissolution/deposition behaviors between the GPE and Li anode are successfully realized with the Li/Li symmetrical ...Continue Reading

References

Jan 27, 2005·Chemical Reviews·Pankaj Arora, Zhengming John Zhang
Nov 3, 2016·Journal of the American Chemical Society·Wei LiuYi Cui
Feb 15, 2017·ACS Applied Materials & Interfaces·Qin PanWei Gao
Mar 14, 2017·Chemical Society Reviews·Wenjing LuXianfeng Li
Mar 12, 2020·Science Advances·Shanhai GeChao-Yang Wang
Apr 16, 2020·Chemical Society Reviews·Xin ZhangZhen Zhou

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Methods Mentioned

BETA
scanning electron microscopy
differential scanning calorimetry

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