Protective layer for an anode of a lead acid battery
OwnerEran Turi, Brett Kilhenny +1inventors
InventorsEran Turi, Brett Kilhenny, Wei Wang
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Abstract
In an aspect, a lead acid battery comprises a sealed casing comprising sulfuric acid; an anode and a cathode that are both at least partially immersed in the sulfuric acid; wherein the anode comprises a current collector, an active layer, and a protective layer located in between the current collector and the active layer; wherein the protective layer comprises an electrically conductive carbon, a crosslinked, acid functionalized polymer, and an aliphatic acid or derivative thereof, wherein the aliphatic acid comprises a C6-30 aliphatic carboxylic acid.
Claims20
A lead acid battery comprising:
- a sealed casing comprising sulfuric acid;
- an anode and a cathode that are both at least partially immersed in the sulfuric acid;
- wherein the anode comprises a current collector, an active layer, and a protective layer located in between the current collector and the active layer;
- wherein the protective layer comprises
- an electrically conductive carbon;
- a crosslinked, acid functionalized polymer;
- and
- an aliphatic acid or derivative thereof, wherein the aliphatic acid comprises a C6-30 aliphatic carboxylic acid.
A lead acid battery comprising:
- a sealed casing comprising sulfuric acid;
- an anode and a cathode that are both at least partially immersed in the sulfuric acid;
- wherein the anode comprises a current collector, an active layer, and a protective layer located in between the current collector and the active layer;
- wherein the protective layer has a thickness of 1 to 13 micrometers;
- wherein the protective layer comprises
- 8 to 70 wt % an electrically conductive carbon based on the total weight of the protective layer, wherein the electrically conductive carbon comprises at least one of carbon black, graphite, carbon nanotubes, or graphene;
- 30 to 95 wt % of a crosslinked, acid functionalized polymer based on the total weight of the protective layer, wherein the crosslinked, acid functionalized polymer comprises a poly((meth)acrylic acid) homopolymer or a poly((meth)acrylic acid) copolymer;
- and
- an aliphatic acid or derivative thereof, wherein the aliphatic acid comprises a C6-30 aliphatic carboxylic acid;
- and
- wherein at least a portion of the aliphatic acid is covalently bound to the crosslinked, acid functionalized polymer and the grafting efficiency of the aliphatic acid, as defined by the weight of the covalently bound aliphatic acid divided by the total weight of the covalently bound aliphatic acid and the crosslinked acid functionalized polymer times 100, is 0.1 to 50%.
Dependencies are inferred from the claim text.