A Gel Polymer Electrolyte Reinforced Membrane for Lithium-Ion Batteries via the Simultaneous-Irradiation of the Electron Beam.

Jian Hou,Chang Hyun Lee,In Kee Park,Woo Ju Cha

doi:10.3390/membranes11030219

Jian Hou, Chang Hyun Lee + Show 2 more

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https://doi.org/10.3390/membranes11030219

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Journal: Membranes	Publication Date: Mar 19, 2021
Citations: 5	License type: CC BY 4.0

Affiliation: Dankook University

Abstract

In this research, a series of innovative and stable cross-linked gel polymer reinforced membranes (GPRMs), were successfully prepared and investigated for application in lithium-ion batteries. Herein, a gel directly within the commercial polyethylene (PE) separator is supported via electron-beam simultaneous irradiation cross-linking of commercial liquid electrolyte and poly(ethylene glycol) methacrylate (PEGMA) oligomers. The physical and electrochemical properties of the GPRMs were characterized by SEM, TEM, mechanical durability, heating shrinkage, and ion conductivity, etc. The GPRMs demonstrated excellent mechanical durability and high ion conductivity compared with traditional PE membranes. Moreover, coin-typed cells were assembled and cycle performance was also studied compared with same-typed cells with commercial PE membrane and liquid electrolyte. As a result, the coin-typed cells using GPRMs also showed a relatively good efficiency on the 50th cycles at a high 1.0 C-rate. These GPRMs with excellent properties present a very promising material for utilization in high-performance lithium-ion batteries with improved safety and reliability.

Highlights

Lithium-ion batteries are one of the most promising and efficient high energy density systems for electrochemical energy storage
For general secondary lithium-ion batteries, its function as an ion conductive medium of rechargeable lithium battery is fulfilled by using an ion-conductive liquid electrolyte in which lithium salt is dissolved and a polyolefin separator to improve the transfer rate of lithium ions, dendrite growth that penetrates the membrane separating the anode and cathode can occur
When 10 wt% or more of poly(ethylene glycol) methacrylate (PEGMA) is introduced, gelation begins to occur in the pore structure of the PE support, and when 40 wt% or more is introduced, it can be seen that gelation occurs in the pore structure of the PE support but there is excess gelation to cover the pores of the surface

Summary

Introduction

Lithium-ion batteries are one of the most promising and efficient high energy density systems for electrochemical energy storage. For general secondary lithium-ion batteries, its function as an ion conductive medium of rechargeable lithium battery is fulfilled by using an ion-conductive liquid electrolyte in which lithium salt is dissolved and a polyolefin separator to improve the transfer rate of lithium ions, dendrite growth that penetrates the membrane separating the anode and cathode can occur. There have been many studies on gel polymer electrolyte which was coated onto a porous separator under UV or plasma irradiation These grafting prepolymers are very active and lead to storge problems [16,17,18]. Developing a highly durable electrolyte-separator with excellent ion conductivity at the level of a liquid electrolyte is an immediate problem of secondary lithium battery separators [19,20]

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