Citation: Yun-ni Chen, Qin Xiao, Qing-yin Li, Shi-jie Ren. Preparation and Characterization of Electrospinning Crosslinked Gel Polymer Electrolytes[J]. Acta Polymerica Sinica, ;2020, 51(2): 183-190. doi: 10.11777/j.issn1000-3304.2019.19149 shu

Preparation and Characterization of Electrospinning Crosslinked Gel Polymer Electrolytes

State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering,Sichuan University, Chengdu 610065

Corresponding author: Shi-jie Ren, rensj@scu.edu.cn
Received Date: 4 August 2019
Revised Date: 5 September 2019

Gel polymer electrolytes (GPEs) for lithium ion batteries (LIBs) have attracted great attention due to their high ionic conductivity and safety, but it is still a great challenge to develop GPEs which can be used at high temperature in specific applications, such as oil drilling, mining, military and aerospace electronics. Cross-linking is one of the efficient methods for enhancing the thermal stabilities of GPEs. In this work, crosslinked gel polymer electrolytes (e-CGPEs) were made by electrospinning and Friedel-Crafts alkylation reaction. First of all, electrospun polymer membranes (e-PMs) were prepared by electrospinning technique with poly(vinylidene fluoride) (PVDF) as the matrix and polystyrene-b-poly(ethylene oxide)-b-polystyrene (PS-PEO-PS) triblock copolymer as the additive. Then the styrene units in e-PMs were crosslinked by Friedel-Crafts alkylation reaction to give electrospun crosslinked polymer membranes (e-CPMs). e-CPMs were activated by absorbing electrolytes to give crosslinked gel polymer electrolytes (e-CGPEs). The effects of PS-PEO-PS content (3%, 5%, 10%, 20%) on the properties of e-CPMs and e-CGPEs were also discussed. The results show that the content of PS-PEO-PS can affect the crystallinity, electrolyte uptake and crosslinked degree of e-CPMs, which may have influences on the ionic conductivity. Owing to the abundant crosslinked networks, high-temperature dimensional stabilities of e-CPMs are much better than that of electrospun PVDF membrane and commercial polypropylene (PP) membrane. All e-CPMs show almost no dimensional shrinkage at 160 °C, indicating that e-CPMs can be efficient precursors of GPEs used at high temperature. e-CGPEs have better electrochemical performances than the PVDF-based GPE (e-PVDF), due to their high porosity, electrolyte uptake and ionic conductivity. Among all the e-CGPEs, e-CGPE 5% with proper PS-PEO-PS content and crosslinked degree possesses the highest ionic conductivity of 6.52 mS/cm at room temperature. The half-cell assembled by e-CGPE 5% shows a discharge specific capacity of 83.5 mAh/g at 2 C. e-CGPEs also exhibit excellent cycle and rate performances. e-CGPE 5% has a capacity retention of 99.7% after 100 cycles at 0.1 C. All the results suggest that e-CGPEs have potential application value in high-efficiency lithium ion batteries which could be used at high temperature. And this work also provides a new path for the preparation of crosslinked gel polymer electrolytes with high efficiency and good performance.
- Electrospinning,
- Friedel-Crafts alkylation reaction,
- Lithium ion battery,
- Gel polymer electrolyte,
- Crosslinked networks
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