Methods of coating an electrically conductive substrate and related electrodepositable compositions
Methods are disclosed in which an electrically conductive substrate is immersed into an electrodepositable composition, the substrate serving as an electrode in an electrical circuit comprising the electrode and a counter-electrode immersed in the composition, a coating being applied onto or over at least a portion of the substrate as electric current is passed between the electrodes. The electrodepositable composition comprises: (a) an aqueous medium; (b) an ionic resin; and (c) solid particles.
1. A method of producing an electrode for a lithium on battery comprising:
immersing an electrically conductive substrate into an electrodepositable composition, the substrate serving as the electrode in an electrical circuit comprising the electrode and a counter-electrode immersed in the composition, a coating being applied onto or over at least a portion of the substrate as electric current is passed between the electrodes,
the electrodepositable composition comprising:
(a) an aqueous medium;
(b) an ionic resin; and
(c) solid particles comprising:
(i) lithium-containing particles, and
(ii) electrically conductive particles;
wherein the composition has a weight ratio of solid particles to ionic resin of at least 17:1 and the weight ratio of lithium-containing particles to electrically conductive particles being at least 3:1.
2. The method of claim 1 , wherein the substrate is a foil comprising aluminum, iron, copper, manganese, nickel, a combination thereof, and/or an alloy thereof.
3. The method of claim 1 , wherein the ionic resin is anionic.
4. The method of claim 3 , wherein the anionic resin comprises a base-neutralized carboxylic acid group-containing resin.
5. The method of claim 1 , wherein the lithium-containing particles comprise LiCoO 2 , LiNiO 2 , LiFePO 4 , LiCoPO 4 , LiMnO 2 , LiMn 2 O 4 , Li(NiMnCo)O 2 , and/or Li(NiCoAl)O 2 .
6. The method of claim 1 , wherein the lithium-containing particles are present in en amount of at least 50 percent by weight, based on the total weight of the solids in the composition.
7. The method of claim 1 , wherein the electrically conductive particles comprise electrically conductive carbon particles.
8. The method of claim 7 , wherein the electrically conductive carbon particles comprise carbon black.
9. The method of claim 1 , wherein the composition has a total solids content of 1 to 5 percent by weight, based on the total weight of the composition.