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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Mani Karthik (CIC energiGUNE), Abdessamad Faik (CIC energiGUNE) and Stefania Doppiu (CIC energiGUNE)
Michel Armand (CIC energiGUNE), Teófilo Rojo (CIC energiGUNE), Gurpreet Singh (CIC energiGUNE), Laida Otaegui (CIC energiGUNE), Frederic Aguesse (CIC energiGUNE) and Lucienne Buannic (CIC energiGUNE)