Process for making electrodes for lithium based...

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H01M 4/04 (2006.01) C08J 5/22 (2006.01) C08L 71/02 (2006.01) H01M 4/60 (2006.01)

Patent

CA 2717204

A process for making an electrode sheet for lithium electrochemical cells is disclosed. The process comprises the steps of : a) admixing a polyether polymer or copolymer soluble in water, at least one lithium salt, at least one electrochemically active material and water to form a water-based solution/suspension containing by weight at least 20% active electrode material, at least 5 % of a polyether polymer or copolymer, and at least 1.5 % lithium salt; b) coating the water-based solution/suspension in the form of an electrode thin film onto an electrode support; and, c) drying the electrode thin film to obtain an electrode thin sheet having less than 1000ppm of residual water. The electrode thin sheet thereby formed has less than 10% porosity after drying. The drying step is preferably carried out through a dryer/oven tunnel having incremental drying zones.

L'invention porte sur un procédé de fabrication d'une feuille d'électrode pour piles électrochimiques au lithium. Le procédé consiste à : a) mélanger un polymère ou copolymère de polyéther soluble dans l'eau, au moins un sel de lithium, au moins un matériau électrochimiquement actif et de l'eau afin de former une solution/suspension à base d'eau contenant en poids au moins 20 % de matériau d'électrode active, au moins 5 % de polymère ou copolymère de polyéther, et au moins 1,5 % de sel de lithium; b) déposer en couche la solution/suspension à base d'eau sous la forme d'un film mince d'électrode sur un support d'électrode; et c) sécher le film mince d'électrode afin d'obtenir une feuille mince d'électrode contenant moins de 1 000 ppm d'eau résiduelle. La feuille mince d'électrode ainsi formée a une porosité inférieure à 10 % après séchage. L'étape de séchage est de préférence effectuée à travers un tunnel sécheur/four ayant des zones de séchage incrémentielles.

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