Graphite and dispersant additives for battery paste compositions
AssigneeThe Curators of the University of Missouri
InventorsFatih Dogan, Julian Kosacki
Life of this patent
Estimating the term…
Abstract
Various graphite additives were incorporated into the positive battery paste composition to compare their effects on the positive active mass utilization of lead-acid batteries. The disclosure is related to battery paste composition for preparing a lead-acid battery plate comprising a graphite additive selected from the group consisting of globular natural graphite, natural flake graphite, expanded flake graphite, and combinations thereof. The disclosure is also related to a battery paste composition comprising a sodium polymethacrylate dispersant. The disclosure is further related to batteries prepared by these battery paste compositions.
Claims16
A lead-acid battery comprising a positive battery plate having a battery paste composition adhered thereto, the battery paste composition comprising an active material and a graphite additive;
- wherein the graphite additive is selected from the group consisting of:
- anisotropic graphite having a specific surface area of from about 0.5 to about 20 m2/g and a median particle size from about 10 μm to about 30 μm;
- expanded flake graphite having a specific surface area of from about 10 to about 20 m2/g and an average particle size of from about 30 μm to about 50 μm;
- and combinations thereof;
- wherein the graphite additive comprises a degree of graphitic order (calculated by the ratio of amorphous to graphitic domain peak intensities
- I
- D
- I
- G
- determined from Raman spectra) of less than about 0.08.
Dependencies are inferred from the claim text.