Solid polymer electrolyte based on waterborne polyurethane with LiCF3SO3 salt for all-solid-state lithium-ion batteries

A. VERGALITO; M. G ORTIZ; O. PARDINI; J. AMALVY

Mar del Plata

Congreso; 34th Topical Meeting International Society of of the Electrochemistry; 2023

INTEMA- Universidad Nacional de Mar del Plata

Rechargeablelithium-ion batteries have begun to play the role of energy vector foralternative solar and wind energy, as well as being used for energy storage formobile and stationary applications [1]. The use of energy sources based onrenewable resources have already been widely recognized as the optimalalternative to solve the problems associated with conventional thermalcombustion of fossil fuels. Due to their intermittent operationcharacteristics, these systems must be complemented with electrochemicaldevices for storing electricity, such as advanced rechargeable batteries orstorage systems for hydrogen produced by electrolysis. To achieve highconversion efficiency and maximum current drain rate in electrochemicaldevices, it is required to minimize the energy losses of the processesinvolved. Hence, the design and synthesis of new materials for the system, withcomposition, transport and conductivity properties, and adequate surfacestructure are necessary to optimize the energy conversion and storageprocesses.In the case of conventionallithium-ion battery using organic carbonates, several studies have been made toimprove its safety performance since the solvent could drain and causeexplosion or react with the electrode materials. One main challenge is thereplace of the liquid electrolytes by solid ones. As a result, polymericmaterials with adequate ionic conductivity without using organic solvents aregood candidates and among them, polyurethanes seem to be potential systems,since their properties could be tailored by the selection of rawmaterials.  In this work,different polyurethanes based on isophorone diisocyanate (IPDI), weresynthesized in order to obtain a material with good electrochemical andmechanical properties. LiCF3SO3 was dissolved in theobtained polymeric dispersions with different amount of lithium salt. Thepolymer synthesized with poly(ethylene glycol monomethyl ether)-basedtrimethylolpropane (MPEG-diol, molecular weight 1000 Perstorp Co.), andpolyethylene oxide (PEO) molecular weight 400 as polyols, presents very goodmechanical and electrochemical properties with ionic conductivity in the rangeof 10-7- 10-5. This material could be a good candidate asa solid electrolyte for use in Li-ion batteries.