Lithium deposition with multilayer nanomebrane
AssigneeToyota Motor Engineering & Manufacturing North America, Inc.
InventorsClaudiu B. Bucur, John Muldoon, Adrian Lita
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Abstract
An electrode for a lithium battery constructed of a metal foil current collector, a coating of a pH sensitive polyelectrolyte polymer directly on the metal foil current collector; and a polyelectrolyte polymer nanomembrane comprising alternating layers of oppositely charged polyelectrolyte polymer wherein each succeeding polyelectrolyte layer has excess charge over the previous layer is provided. The pH sensitive polymer may be poly(allylamine hydrochloride) (PAH), poly(dimethyldiallyl ammonium chloride) (PDAD), poly(vinyl pyridine) (PPy), polyethyleneimine (PEI), polyacrylic acid (PAA), polymethacrylic acid (PMA) or poly(styrene sulfonic acid-maleic acid, sodium salt) (PSSM3:1).
Claims10
An electrode for a lithium battery, comprising, in the order listed:
- a metal foil current collector;
- a granular layer of electrodeposited lithium metal on the surface of the metal foil current collector;
- a coating of a pH sensitive polyelectrolyte polymer on the electrodeposited lithium metal layer;
- a polyelectrolyte polymer nanomembrane on the pH sensitive polyelectrolyte polymer which comprises alternating layers of oppositely charged polyelectrolyte polymer wherein each succeeding polyelectrolyte layer has excess charge over the previous layer, and
- a solid electrolyte interface on a surface of the polyelectrolyte nanomembrane which is not facing the metal foil current collector;
- wherein the granular lithium metal layer is electrodeposited on the metal foil collector after the coating of a pH sensitive polyelectrolyte polymer, the polyelectrolyte polymer nanomembrane and the solid electrolyte interface are formed.
An electrode for a lithium battery, comprising:
- a copper metal current collector;
- a layer of a pH sensitive polyelectrolyte polymer directly coated on a surface of the copper current collector;
- and
- a polyelectrolyte polymer nanomembrane comprising alternating layers of oppositely charged polyelectrolyte polymer wherein each succeeding polyelectrolyte layer has excess charge over the previous layer;
- wherein
- the pH sensitive polymer is a polymer selected from the group consisting of poly(allylamine hydrochloride) (PAH), poly(dimethyldiallyl ammonium chloride) (PDAD) and poly(vinyl pyridine) (PPy), and
- the polyelectrolyte polymer nanomembrane comprises alternating layers of oppositely charged polyelectrolyte polymer selected from the group consisting of PEDOT:PSS/PPy, PEDOT:PSS/PDAD and Nafion/PDAD.
Dependencies are inferred from the claim text.