en.Wedoany.com Reported - A research team from the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, has made progress in the study of key materials for high-specific-energy all-solid-state batteries, developing a novel organic-inorganic composite solid electrolyte material that offers a new technical pathway for improving the cycle life of solid-state batteries.

Solid electrolytes have long faced challenges such as poor interfacial contact with electrodes, insufficient flexibility, low ionic conductivity, and inadequate electrochemical stability, which have hindered their practical application. The team proposed a strategy for in-situ chemical reconstruction of the organic phase induced by the inorganic phase, utilizing the Lewis base active sites on the surface of lithium oxychloride (Li₃OCl) to induce an in-situ dehydrofluorination reaction of polyvinylidene fluoride (PVDF) at the interface, generating unsaturated carbon-carbon double bond structures. This reaction transforms the traditional weak physical or chemical bonding at the organic-inorganic interface into strong chemical bonding, constructing a continuous lithium-ion conduction pathway with low transport energy barriers.

This strategy achieves interfacial chemical reconstruction, combining the dual advantages of high ionic conductivity and high stability of inorganic materials with the high flexibility and high interfacial compatibility of polymers. Based on this strategy, the team prepared a PVDF-Li₃OCl composite solid electrolyte. This electrolyte exhibits good electrochemical performance, mechanical stability, and single-ion conduction characteristics. An NCA ternary solid-state battery equipped with this electrolyte and its separator can stably cycle 350 times at a 1C rate, achieving a capacity retention rate of 84.2%, demonstrating high cycling stability.

The related research results were published in the Journal of Colloid and Interface Science under the title "An innovative dehydrofluorinated composite gel electrolyte for enhanced solid-state batteries."

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