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Comprehensive Study of Solvents for Wet Process Applied to Sulfide-based All Solid State Battery

Article of Honda R&D Technical Review Vol.33 No.2

Summary

In the process of creating a wet process for a sulfide-based all solid state battery, it was necessary to search for suitable solvents. A systematic examination was therefore made of solid electrolytes and the reactivity of solvents. A halogen-doped argyrodite solid electrolyte that shows high lithium-ionic conductivity did not react with a hydrocarbon compound containing no polar group. With ethers, esters, ketones, and nitriles, however, the oxygen atoms and nitrogen atoms in their respective polar groups interact strongly with the solid electrolyte and were expected to form complexes with the lithium ions in the electrolyte. However, solvents having an alkyl chain length with a carbon number of four were not found to form complexes and the ionic conductivity of the solid electrolyte had not been markedly diminished. This is thought to occur because the increase in length of alkyl chains decreases the surface area accessible to coordinating oxygen atoms in the solvent molecules, thereby inhibiting the approach of the solvent to the surface of the solid electrolyte. Setting the carbon number of four or greater for the alkyl group chain length as a solvent search index yielded a direction to pursue for practical application of a wet process.

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Author (organization or company)

Pu QIAN(Innovative Research Excellence)、Hiroshi SAKAI(Innovative Research Excellence)、Atsushi OGAWA(Innovative Research Excellence)、Hiroto MAEYAMA(Innovative Research Excellence)、Terumi FURUTA(Innovative Research Excellence)

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