Chemically and compositionally modified solid solution...

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H01M 4/32 (2006.01) H01M 10/26 (2006.01) H01M 10/30 (2006.01) H01M 10/34 (2006.01) H01M 4/52 (2006.01)

Patent

CA 2157484

A high capacity, long cycle life positive electrode for use in an alkaline rechargeable electrochemical comprising: a solid solution nickel hydroxide material having a multiphase structure that comprises at least one polycrystalline .gamma.-phase including a polycrystalline .gamma.- phase unit cell comprising spacedly disposed plates with at least one chemical modifier incorporated around the plates, the plates having a range of stable intersheet distances corresponding to a 2+ oxidation state and a 3.5+, or greater, oxidation state; and at least one compositional modifier incorporated into the solid solution nickel hydroxide material to promote the multiphase structure.

Une électrode positive à haute capacité et à longue durée de vie utilisée dans une pile électrochimique rechargeable alcaline comprend: un matériau d'hydroxyde de nickel à solution solide possédant une structure multiphasie qui comporte au moins une phase gamma polycristalline renfermant un élément primaire unitaire à phase gamma polycristalline, cet élément primaire comportant des plaques espacées autour desquelles est incorporé au moins un agent modifiant chimique. Ces plaques possèdent une plage de distances interfeuille stables correspondant à un état d'oxydation 2+ et 3,5+ ou à un état d'oxydation supérieur; et au moins un agent modifiant compositionnel incorporé dans le matériau d'hydroxyde de nickel à solution solide afin de stimuler la structure polyphasie.

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