Bilayer electrolyte for a lithium battery

Details Bilayer electrolyte for a lithium battery Bilayer electrolyte for a lithium battery

H - Electricity

01

M

H01M 10/056 (2010.01) B32B 27/08 (2006.01)

Patent

CA 2595355

The invention relates to a bilayer polymer electrolyte for a lithium battery. The inventive electrolyte comprises N and P layers which are each formed by a solid solution of an Li salt in a polymer material, said Li salt being the same in both layers, whereby the concentration of polymer material is at least 60 % by weight and the concentration of lithium salt is between 5 and 25 % by weight. The polymer material from layer P contains a solvating polymer and a non-solvating polymer, the weight ratio between the two polymers being such that the solvating polymer forms a continuous network. The polymer material from layer N is formed by a solvating polymer and, optionally, a non-solvating polymer, the weight ratio between the two polymers being such that the solvating polymer forms a continuous network and the non-solvating polymer does not form a continuous network.

L'invention concerne un électrolyte polymère bicouche pour une batterie au lithium. L'électrolyte comprend les couches N et P, constituée chacune par une solution solide d'un sel de Li dans un matériau polymère, le sel de Li étant le même dans les deux couches, la teneur en matériau polymère étant d'au moins 60 % en poids, et la teneur en sel de lithium de 5 à 25 % en poids. Le matériau polymère de la couche P contient un polymère solvatant et un polymère non solvatant, le rapport en poids des deux polymères étant tel que le polymère solvatant forme un réseau continu. Le matériau polymère de la couche N est constitué par un polymère solvatant, et éventuellement un polymère non solvatant, le rapport en poids des deux polymères étant tel que le polymère solvatant forme un réseau continu, et le polymère non solvatant ne forme pas un réseau continu.

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