Michel Armand (CIC energiGUNE) and Devaraj Shanmukaraj (CIC energiGUNE)
Researchers at CIC energiGUNE have developed a novel family of PVA-based dry polymer electrolytes with high ionic conductivity and good electrochemical stability.
The choice of polymer matrix is a critical criterion for obtaining a highly conductive and mechanically/electrochemically stable polymer electrolyte at close to ambient operating temperatures. In order to obtain the aforementioned properties, the polymer matrix should possess better Li+ solvation properties and facilitate faster Li salt dissociation. In this sense, Poly Vinyl Alcohol (PVA) was chosen due to its excellent film forming property, biodegradability, non-toxicity and non-carcinogenetic and excellent chemical resistance.
The polymer electrolytes of the invention have a PVA polymer backbone with side chain esters. The esters can either be a single ester or a double ester group or even a salt anion attached to the ester group. This modification facilitates the high flexibility of the polymer chain thereby leading to a decreased Tg value and high ionic conductivity at close to ambient temperature for successful high performance solid-state batteries compatible with high voltage cathodes.
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Laida Otaegui (CIC energiGUNE), Aitor Villaverde (CIC energiGUNE), Amaia Quintela (CIC energiGUNE), Maria Carmen Morant-Miñana (CIC energiGUNE), Lucienne Buannic (CIC energiGUNE), Ian Paul Gilbert (Ormazabal Corporate Technology)
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