Improved battery paste compositions and electrochemical...

H - Electricity – 01 – M

Patent

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Details

H01M 4/62 (2006.01) H01M 4/20 (2006.01) H01M 4/56 (2006.01) H01M 10/06 (2006.01) H01M 4/02 (2006.01) H01M 6/10 (2006.01)

Patent

CA 2288847

An improved battery paste composition and a lead-acid electrochemical cell (22) which incorporates the composition. The cell (22) includes a positive current collector (30) and a negative current collector (40) which are each coated with a paste (54, 60) containing one or more lead-containing compositions and a paste vehicle to form a positive plate (55) and a negative plate (61). An absorbent electrolyte-containing separator member (50) may also be positioned between the positive and negative plates (55, 61). The paste (54, 60) on the positive current collector (30), the negative current collector (40), or both further includes a special additive consisting of polyvinylsulfonic acid or salts thereof which provides many benefits including improved battery cycle life, increased charge capacity, and enhanced overall stability. The additive also makes the pastes smoother and more adhesive, thereby improving the paste application process. The paste compositions of interest may be used in conventional flat-plate cells or in spirally wound batteries with equal effectiveness.

L'invention concerne une composition de pâte à batterie améliorées ainsi qu'une cellule électrochimique (22) au plomb contenant la composition. La cellule (22) comprend un collecteur de courant positif (30) et un collecteur de courant négatif (40) lesquels sont enrobés d'une pâte (54, 60) comprenant une ou plusieurs compositions contenant du plomb ainsi qu'un véhicule pour la pâte destiné à former une plaque positive (55) et une plaque négative (61). On peut également positionner un élément séparateur absorbant (50) contenant l'électrolyte entre les plaques positive et négative (55, 61). La pâte (54, 60) sur le collecteur (30) de courant positif, le collecteur (40) de courant négatif ou l'un et l'autre comprend également un additif spécial composé d'acide polyvinylsulfonique ou de ses sels, lequel offre de nombreux avantages notamment une vie utile de batterie améliorée, une capacité de charge augmentée et une meilleure stabilité globale. L'additif rend également les pâtes plus lisses et plus adhésives, améliorant ainsi le processus d'application de la pâte. On peut utiliser les compositions de pâte de l'invention dans des cellules classiques à plaque plane ou dans des batteries à enroulement spiralé avec un même rendement.

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