Enhanced nickel hydroxide positive electrode materials for...

H - Electricity – 01 – M

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H01M 4/32 (2006.01) H01M 4/525 (2010.01)

Patent

CA 2203238

A positive electrode material comprising particles (1) including at least one electrochemically active hydroxide and a substantially continuous, uniform encapsulant layer (4) surrounding the particles of positive electrode material. The encapsulant layer is formed from a material which, upon oxidation during processing or charging of the electrode, is convertible to a highly conductive form and upon subsequent discharging of the electrode does not revert to its previous form. Preferably, the electrochemically active hydroxide includes at least nickel hydroxide. The encapsulant layer is preferably formed from at least cobalt hydroxide or cobalt oxyhydroxide and is formed by precipitation from a cobalt salt solution, which can be a cobalt sulfate solution. Electrodes which include the electrochemically active material as well as a precipitation process for forming the material are disclosed.

La présente invention concerne une matière d'électrode positive, qui comporte des particules (1) présentant au moins un hydroxyde électrochimiquement actif et une couche (4) d'enrobage sensiblement continue, uniforme, qui entoure les particules de matière d'électrode positive. La couche d'enrobage est constituée d'une matière qui, lors de l'oxydation durant le traitement ou la charge de l'électrode, peut prendre une forme qui présente une conductivité élevée et, lors de la décharge suivante de l'électrode, ne reprend pas sa forme antérieure. De préférence, l'hydroxyde électrochimiquement actif comprend au moins de l'hydroxyde de nickel. La couche d'enrobage est de préférence constitutée au moins d'hydroxyde de cobalt ou d'oxyhydroxide de cobalt et elle est formée par précipitation d'une solution de sel de cobalt qui peut être une solution de sulfate de cobalt. La présente invention porte aussi sur des électrodes qui comportent la matière électrochimiquement active, ainsi que sur un traitement par précipitation qui donne la matière en question.

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