WATER SOLUBLE PAA-BASED POLYMER BLENDS AS BINDERS FOR SI DOMINANT ANODES
Systems and methods utilizing water soluble (aqueous) PAA-based polymer binders for silicon-dominant anodes may include an electrode coating layer on a current collector, where the electrode coating layer is formed from silicon and a pyrolyzed water soluble PAA-based polymer blend, wherein the water soluble PAA-based polymer blend comprises PAA and one or more additional water-soluble polymer components. The electrode coating layer may include more than 70% silicon and the anode may be in a lithium ion battery.
1 . A battery electrode, the electrode comprising:
an electrode coating layer on a current collector, the electrode coating layer formed from an electrode slurry comprising silicon and a water soluble PAA-based polymer blend, wherein said water soluble PAA-based polymer blend comprises PAA and one or more additional water-soluble polymer components;
wherein said one or more additional water-soluble polymer components comprises a polymer containing one or more functional groups selected from the group consisting of —OH, NH—, NH2, and —COOH; and
wherein said electrode slurry has a slurry viscosity of 1500-2000 cps.
2 . The electrode according to claim 1 , wherein one of said one or more additional water-soluble polymer components is phenolic resin.
3 . The electrode according to claim 2 , wherein the concentration of said phenolic resin in the water soluble PAA-based polymer blend is <30 wt. %
4 . The electrode according to claim 1 , wherein said water soluble PAA-based polymer blend is a tertiary system comprising PAA and two additional water-soluble polymer components.
5 . The electrode according to claim 4 , wherein said water soluble PAA-based polymer blend is a tertiary system comprising PAA, phenolic resin and a third water-soluble polymer component.
6 . The electrode according to claim 1 , wherein the electrode coating layer further comprises conductive additives.
7 . The electrode according to claim 1 , wherein the current collector comprises one or more of a copper, tungsten, stainless steel, and nickel foil in electrical contact with the electrode coating layer.
8 . The electrode according to claim 1 , wherein the electrode coating layer comprises more than 70% silicon.
9 . The electrode according to claim 1 , wherein the electrode is in electrical and physical contact with an electrolyte, the electrolyte comprising a liquid, solid, or gel.
10 . The electrode according to claim 1 , wherein the battery electrode is in a lithium ion battery.
11 . A method of forming an electrode, the method comprising:
creating an electrode coating layer from an electrode slurry comprising an aqueous solution of a water soluble PAA-based polymer blend and Si powder;
fabricating a battery electrode by coating the slurry on a current collector; and
pyrolyzing said electrode coating layer;
wherein said water soluble PAA-based polymer blend comprises PAA and one or more additional water-soluble polymer components;
wherein said one or more additional water-soluble polymer components comprises a polymer containing one or more functional groups selected from the group consisting of —OH, NH—, NH2, and —COOH; and
wherein said electrode slurry has a slurry viscosity of 1500-2000 cps.
12 . The method of claim 11 , wherein one of said one or more additional water-soluble polymer components is phenolic resin.
13 . The method of claim 12 , wherein the concentration of said phenolic resin in the water soluble PAA-based polymer blend is <30 wt. %
14 . The method of claim 11 , wherein said water soluble PAA-based polymer blend is a tertiary system comprising PAA and two additional water-soluble polymer components.
15 . The method of claim 14 , wherein said water soluble PAA-based polymer blend is a tertiary system comprising PAA, phenolic resin and a third water-soluble polymer component.
16 . The method according to claim 11 , wherein the electrode coating layer further comprises conductive additives.
17 . The method according to claim 11 , wherein the current collector comprises one or more of a copper, tungsten, stainless steel, and nickel foil in electrical contact with the electrode coating layer.
18 . The method according to claim 11 , wherein the electrode coating layer comprises more than 70% silicon.
19 . The method according to claim 11 , wherein the electrode is in electrical and physical contact with an electrolyte, the electrolyte comprising a liquid, solid, or gel.
20 . A battery, the battery comprising:
a cathode, a separator, an electrolyte, and an anode, the anode comprising an electrode coating layer on a current collector, the electrode coating layer formed from an electrode slurry comprising silicon and a pyrolyzed water soluble PAA-based polymer blend, wherein said water soluble PAA-based polymer blend comprises PAA and one or more one or more additional water-soluble polymer components;
wherein said one or more additional water-soluble polymer components comprises a polymer containing one or more functional groups selected from the group consisting of —OH, NH—, NH2, and —COOH; and
wherein said electrode slurry has a slurry viscosity of 1500-2000 cps.
21 . The battery of claim 20 , wherein one of said one or more additional water-soluble polymer components is phenolic resin.
22 . The battery of claim 21 , wherein said water soluble PAA-based polymer blend is a tertiary system comprising PAA and two additional water-soluble polymer components.
23 . The battery of claim 22 , wherein said water soluble PAA-based polymer blend is a tertiary system comprising PAA, phenolic resin and a third water-soluble polymer component.