Gel polymer electrolyte for lithium-ion batteries comprising cyclic carbonate moieties

• Published in: Journal of power sources Vol. 271; pp. 239 - 244
• Main Authors: TILLMANN, S. D, ISKEN, P, LEX-BALDUCCI, A
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier 20.12.2014
• Subjects: Applied sciences; Carbonates; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Electrolytes; Electrolytic cells; Ethers; Exact sciences and technology; Liquids; Lithium-ion batteries; Monomers; Solvents; Lithium ion batteries; Methacrylates; Lithium-ion battery; Polymer electrolytes; Methacrylate; Polymer solid electrolyte; Secondary cell; Cyclic carbonate; Carbonates; Gel polymer electrolyte
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2014.07.185

A polymer system based on oligo (ethylene glycol) methyl ether methacrylate (OEGMA) and cyclic carbonate methacrylate (CCMA) was chosen as matrix to realize high-performance gel polymer electrolytes due to the fact that both monomers are able to interact with the liquid electrolyte, thus, retaining it inside the matrix. Additionally, OEGMA enables high flexibility, while CCMA provides mechanical stability. The polymer displays a high thermal stability up to 200 [degrees]C and a glass transition temperature below room temperature (5 [degrees]C) allowing an easy handling of the obtained films. By immobilizing the liquid electrolyte 1 M LiPF sub(6) in EC:DMC 1:1 w:w in the polymer host a gel polymer electrolyte with a high conductivity of 2.3 mS cm super(-1) at 25 [degrees]C and a stable cycling behavior with high capacities and efficiencies in Li(Ni sub(1/3)Co sub(1/3)Mn sub(1/3))O sub(2) (NCM)/graphite full cells is obtained. The investigated gel polymer electrolyte is identified as promising electrolyte for lithium-ion batteries, because it combines good electrochemical properties comparable to that of liquid electrolytes with the safety advantage that no leakage of the flammable electrolyte solvents can occur.