Negative electrode plate for lead-acid battery and method for producing the same and lead-acid battery
AssigneeGS Yuasa International Ltd.
InventorYoshiomi Fujiwara
Life of this patent
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Abstract
A lead-acid battery includes a negative electrode plate containing carbon black, fibrous carbon and graphite in a negative active material thereof. The average primary particle size of the carbon black is 10 nm or more and 120 nm or less, and the content thereof is 0.05% by mass or more and 2.2% by mass or less based on the mass of negative active material. The average length of the fibrous carbon is 1 μm or more, and the content thereof is 0.02% by mass or more and 1.2% by mass or less based on the mass of negative active material. The average particle size of the graphite is 20 μm or more, and the content thereof is 0.02% by mass or more and 2.0% by mass or less based on the mass of negative active material.
Claims16
A negative electrode plate for a lead-acid battery which comprises a negative active material, wherein said negative active material is provided with lead sulfate particles, and contains all of a microparticulate material A deposited on surfaces of said lead sulfate particles to impart a conductivity, a fibrous material B crosslinking between crystals of said lead sulfate to impart a conductivity and a macroparticulate material C having a low solubility in an electrolyte solution of said lead-acid battery and a size greater than said fibrous material B.
5-7. (canceled)
14-17. (canceled)
A method for producing a negative electrode plate for a lead-acid battery comprising a blending step of mixing a lead powder consisting of a mixture of lead and lead oxide, a conductive microparticulate material A having an average particle size of 10 nm or more and 120 nm or less, a conductive fibrous material B having an average length of 1 μm or more and 20 μm or less, a macroparticulate material C having an average particle size of 20 μm or more and 200 μm or less, and other additives.
Dependencies are inferred from the claim text.