Cross-linked polymer electrolyte and its application to lithium polymer battery. (10th February 2019)

• Record Type: Journal Article
• Authors: Sakakibara, Takahiro; Kitamura, Mitsuru; Honma, Takumi; Kohno, Hiromi; Uno, Takahiro; Kubo, Masataka; Imanishi, Nobuyuki; Takeda, Yasuo; Itoh, Takahito
• Is Part Of: Electrochimica acta. Volume 296(2019)
• Page Start: 1018
• Page End: 1026
• Publication Date: 2019-02-10
• Subjects: Polymer electrolyte -- Crosslinking -- Electrochemical and mechanical properties -- Lithium polymer battery -- Battery performance; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2018.11.155
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Cross-linked solid polymer electrolytes (cross-linked SPEs) composed of poly(ethylene glycol) dimethyl ethers (PEGDMEs) with various molecular weights and high molecular weight poly(ethylene oxide) (PEO), Acryl-HBP having various ethylene oxide (EO) units (3EO (n = 3), 4EO (n = 4), 6EO (n = 6), 11EO (n = 11)), and LiN(SO2 CF3 )2 salt were prepared by using radical initiator and electron beam (EB) irradiation. The effects of molecular weights of PEGDMEs and PEO, EO units in the Acryl-HBP, crosslinking methods, and EB irradiation intensity on the ionic conductivity and mechanical property for the cross-linked SPEs were investigated. Ionic conductivities of the cross-linked SPEs composed of Acryl-HBP having 4EO (n = 4) units and PEGDME with molecular weight of 500 were found to be 1.24 × 10 −4 S/cm at 20 °C and 1.97 × 10 −3 S/cm at 80 °C for benzoyl peroxide radical initiator and to be 2.44 × 10 −4 S/cm at 20 °C and 3.22 × 10 −3 S/cm at 80 °C for EB irradiation, respectively. Further addition of a copolymer (EO-AGE) of ethylene oxide with allyl glycidyl ether improved mechanical properties of the cross-linked SPE, and provided mechanical strength suitable for practical lithium battery application. The Li4 Ti5 O12 /cross-linked SPE/LiFePO4 –C cell was assembled by using the cross-linked SPE modified with EO-AGE, and the battery performance was evaluated. The battery showed reversible charge-discharge capacity of 42 mAh at 25 °C and C/10 rate. Graphical abstract: Image 1 Highlights: Synthesis of cross-linked solid polymer electrolyte (cross-linked SPE) by electron beam irradiation. Cross-linked SPE having high ionic conductivity, high mechanical strength, and electrochemical and thermal stabilities. Application of cross-linked SPE to lithium polymer battery. Battery performance of the Li4 Ti5 O12 /cross-linked SPE/LiFePO4 -C full cell.