New manganese dioxide electrodes, process for producing the...

H - Electricity – 01 – M

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H01M 10/24 (2006.01) H01M 4/50 (2006.01)

Patent

CA 2279350

New manganese dioxide electrodes are disclosed containing modified, electrochemically active manganese dioxide, as well as a process for producing these new manganese dioxide electrodes and their use in rechargeable batteries. The electrochemically active manganese dioxide contains inorganic particles of a material selected from the group mica, SiO2, Al2O3, ZrO2 and ZnO. The particles are coated with one or several layers which consist of ferroelectric, piezoelectric or pyroelectric substances, such as titanates, stannates, zirconates, wolframates, niobates, silicates or their mixtures, titanium dioxide (anatase or rutile), metal oxides from the group Fe2O3, NiO, CoO, ZrO2, SnO2, TiO2, Sb2O3, PbO, Pb3O4, Bi2O3, WO3, NbO or their mixtures. The coating layers can be doped with foreign ions.

L'invention concerne de nouvelles électrodes en dioxyde de manganèse qui contiennent du dioxyde de manganèse modifié à activité électrochimique, un procédé de production de ces nouvelles électrodes en dioxyde de manganèse et leur utilisation dans des piles rechargeables. Le dioxyde de manganèse électrochimiquement actif contient des particules inorganiques en un matériau sélectionné dans le groupe constitué par la mica, SiO¿2?, Al¿2?O¿3?, ZrO¿2? et ZnO et enrobées d'une ou plusieurs couches de revêtement constituées de substances ferroélectriques, piézo-électriques ou pyroélectriques, par exemple de titanates, de stannates, de zirconates, de wolframates, de niobates, de silicates ou de leurs mélanges, de dioxyde de titane (anatase ou rutile), d'oxydes métalliques du groupe constitué par Fe¿2?O¿3?, NiO, CoO, ZrO¿2?, SnO¿2?, TiO¿2?, Sb¿2?O¿3?, PbO, Pb¿3?O¿4?, Bi¿2?O¿3?, WO¿3?, NbO ou de leurs mélanges, ces couches de revêtement pouvant être dopées avec des ions étrangers.

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