Composite bodies used as separators in electrochemical cells

Details Composite bodies used as separators in electrochemical cells Composite bodies used as separators in electrochemical cells

H - Electricity

01

M

H01M 2/16 (2006.01) H01M 4/02 (2006.01) H01M 4/62 (2006.01) H01M 10/40 (2006.01)

Patent

CA 2348917

The present invention relates to composite bodies that include at least one layer having the following composition: (a) between 1 and 99 wt % of a solid (I) having a primary particle size of 5 nm to 100 µm or a mixture of at least two solids; (b) between 99 and 1 wt % of a polymer binder (II). This polymer binder comprises: between 1 and 100 wt % of a polymer (IIa) or a copolymer (IIa) having reactive groups (RG) located on the chain, at the ends and/or on the sides and capable of cross-linking reactions thermally and/or under the action of UV; and between 0 and 99 % of at least one polymer or copolymer (IIb) free from reactive groups. The at least one layer is applied on at least a second layer comprising at least one traditional separator.

L'invention concerne des corps composites comprenant au moins une couche qui contient comme composition: (a) entre 1 et 99 % en poids d'un solide (I) à grandeur particulaire primaire de l'ordre de 5 nm à 100 mu m ou un mélange d'au moins deux solides; (b) entre 99 et 1 % en poids d'un liant (II) polymère qui contient: (IIa) entre 1 et 100 % en poids d'un polymère ou d'un copolymère (IIa) présentant des groupes réactifs (RG) situés sur la chaîne, aux extrémités et/ou sur les côtés, aptes à des réactions de réticulation par voie thermique et/ou sous l'effet de rayons U.V., et (IIb) entre 0 et 99 % en poids d'au moins un polymère ou d'un copolymère (IIb) exempte de groupes réactifs RG. La couche (au moins au nombre de une) est appliquée sur au moins une deuxième couche comprenant au moins un séparateur classique.

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