Solid electrolytic secondary battery

Details Solid electrolytic secondary battery Solid electrolytic secondary battery

H - Electricity

01

M

H01M 4/02 (2006.01) H01M 4/62 (2006.01) H01M 10/40 (2006.01)

Patent

CA 2294291

A solid-electrolyte secondary battery is provided which comprises a positive electrode, negative electrode and a solid electrolyte provided between the electrodes. The solid electrolyte contains as a matrix polymer a fluorocarbon polymer of 550,000 in weight-average molecular weight (Mw). The fluorocarbon polymer having a weight-average molecular weight of more than 550,000 shows an excellent adhesion to the active material layers of the positive and negative layers. Therefore, the high polymer solid (or gel) electrolyte adheres to the active material layers of the electrodes with a sufficient adhesive strength. A fluorocarbon polymer having a weight-average molecular weight (Mw) over 300,000 and under 550,000 may be used in combination with a fluorocarbon polymer of 550,000 or more in weight-average molecular weight to lower the viscosity for facilitating the formation of a film of the electrolyte.

L'invention se rapporte à un accumulateur électrique à électrolyte solide comportant une électrode positive, une électrode négative et un électrolyte solide interposé entre deux électrodes. L'électrolyte solide contient, en tant que polymère matrice, un polymère de fluor ayant un poids moléculaire moyen en poids (Mw) supérieur ou égal à 550 000, ledit polymère conférant une excellente capacité d'adhésion aux couches de matière active des électrodes positive et négative, ce qui permet de coller aux couches de matière active des électrodes un électrolyte polymère solide ou un électrolyte en gel, avec un pouvoir adhésif suffisant. De façon à obtenir une viscosité de peinture, on peut conjointement utiliser un polymère fluoré ayant un poids moléculaire moyen en poids (Mw) supérieur à 300 000 et inférieur à 550 000.

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