Cathodes for electrochemical cells having additives

• US 5,599,644 A
• Filed: 06/07/1995
• Issued: 02/04/1997
• Est. Priority Date: 06/07/1995
• Status: Expired due to Term

• Current Assignee: Energizer Brands, LLC (Energizer Holdings, Inc.)
• Original Assignee: Eveready Battery Company Incorporated (Energizer Holdings, Inc.)
• Inventors: Swierbut, Wendi M., Nardi, John C.
• Primary Examiner(s): Skapars, Anthony
• Application Number:
  US08/485,424
• Time in Patent Office: 608 Days
• Field of Search: 429/224, 429/206, 429/229, 429/218, 423/599, 423/610, 423/633
• US Class Current: 429/224
• CPC Class Codes: H01M 2004/028 Positive electrodes
• CPC Class Codes: H01M 2300/0014 Alkaline electrolytes
• CPC Class Codes: H01M 4/364 as mixtures
• CPC Class Codes: H01M 4/50 of manganese
• CPC Class Codes: H01M 4/62 Selection of inactive substances as ingredients for active masses, e.g. binders, fillers

Abstract

A cathode for use in an electrochemical cell having an anode and an electrolyte. The cathode includes a manganese dioxide active material and an additive which includes at least one of SnO₂, Fe₂ O₃ -TiO₂, TiO₂ (P-25), BaTiO₃, K₂ TiO₃, Nb₂ O₅, or SnO. The cathode of the present invention is particularly adapted for use in an electrochemical cell having a zinc anode and an alkaline electrolyte.

Claims

1. An electrochemical cell having an anode, a cathode, and an electrolyte, said cathode comprising a manganese dioxide active material and an additive comprising Fe₂ O₃ -TiO₂.

2. The electrochemical cell as defined in claim 1, wherein said anode includes zinc and the electrolyte is an alkaline electrolyte.

3. The electrochemical cell as defined in claim 1, wherein said additive constitutes between about 0.1 to 10 weight percent of said cathode.

4. An electrochemical cell having an anode, a cathode, and an electrolyte, said cathode comprising a manganese dioxide active material and an additive comprising fumed TiO₂.

5. An electrochemical cell having an anode, a cathode, and an electrolyte, said cathode comprising a manganese dioxide active material and an additive comprising a combination of anatase and rutile TiO₂.

6. The electrochemical cell as defined in claim 5, wherein said combination of anatase and rutile TiO₂ includes at least 20 percent rutile TiO₂.

7. A primary akaline electrochemical cell having a zinc anode, a cathode, and an electrolyte, said cathode comprisLng a manganese dioxide active material and an additive comprising Nb₂ O₅.

8. The electrochemical cell as defined in claim 7, wherein said additive constitutes between about 0.1 to 10 weight percent of said cathode.

9. An electrochemical cell having an anode, a cathode, and an electrolyte, said cathode comprising a manganese dioxide active material and an additive comprising SnO.