Negative electrodes of alkaline batteries and their methods of fabrication
AssigneeBYD Company Limited
InventorsZhijian Zhu, Junqing Dong
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Abstract
The present invention discloses negative electrodes for alkaline storage batteries and their methods of fabrication. The material for said negative electrode comprises of an additive that has at least one calcium compound selected from the following: tricalcium silicate, dicalcium silicate, and tricalcium aluminate. The concentration of said additive is between 1 wt % and 15 wt % of the material of said negative electrode. To fabricate said negative electrode, said additive is mixed with an active material for the negative electrode to form a paste, which is then dried. This method of fabrication is simple, convenient and low in cost. An alkaline battery using said material for its negative electrode has long cycle life and a large capacity.
Claims18
A negative electrode material having a retarder and an additive wherein said additive is at least one calcium compound selected from the group consisting of:
- tricalcium silicate, dicalcium silicate, and tricalcium aluminate.
A negative electrode material for an alkaline battery, comprising:
- an additive;
- zinc oxide;
- a metal oxide;
- a retarder;
- carbon black;
- and wherein
- said additive is at least one calcium compound selected from the group consisting of:
- tricalcium silicate, dicalcium silicate, and tricalcium aluminate;
- the concentration of said additive is between 1 wt % and 15 wt % of said material;
- said metal oxide is at least a metal oxide selected from the group consisting of:
- PbO, CdO and Bi2O3;
- said retarder is calcium sulfate dihydrate;
- and
- the molar ratio of said retarder to said additive is (greater than 0 to 3:1.
A method for fabricating a negative electrode material, comprising the steps of:
- mixing ingredients to form said material in a paste form, wherein said ingredients to form said material include an active material, an additive, and a retarder;
- coating said paste onto a current collector;
- and
- drying said paste;
- and
- wherein said additive is at least one calcium compound selected from the group consisting of:
- tricalcium silicate, dicalcium silicate, and tricalcium aluminate.
Dependencies are inferred from the claim text.