Positive electrode binder for alkaline storage battery
View Patent ↗A positive electrode for an alkaline storage battery is disclosed, comprising a conductive base material and an active material layer attached to the base material, the active material layer comprising an active material and a binder, the binder comprising an elastic copolymer comprising one or more tetrafluoroethylene units and one or more propylene units.
1. A method for producing an alkaline storage battery comprising the steps of:
producing a positive electrode by preparing a paste mixture of an active material with an emulsion comprising a binder dispersed in an aqueous medium, wherein the binder comprises an elastic copolymer comprising one or more tetrafluoroethylene units and one or more CHCH 3 CH 2 units in a mole ratio of 3:7 to 7:3 and the binder is present in an amount of 1 to 10 parts by weight per 100 parts by weight of the active material, and wherein the active material comprises nickel hydroxide;
applying the paste to a conductive base material; and
assembling the positive electrode in the alkaline storage battery.
2. The method for producing an alkaline storage battery according to claim 1 , wherein a content of the binder in the emulsion is from not less than 0.1% by weight to not more than 60% by weight.
3. The method for producing an alkaline storage battery according to claim 1 , wherein said elastic copolymer further comprises one or more vinylidene fluoride units.
4. The method for producing an alkaline storage battery in accordance with claim 3 , wherein the content of said vinylidene fluoride units is 5 mole % or less of said elastic copolymer.