Protected electrode structures
An electrode structure and its method of manufacture are disclosed. The disclosed electrode structures may be manufactured by depositing a first release layer on a first carrier substrate. A first protective layer may be deposited on a surface of the first release layer and a first electroactive material layer may then be deposited on the first protective layer.
1. An electrochemical system, comprising:
a first electrode structure comprising:
a first release layer comprising one or more of the following materials: polysulfones, polyethersulfone, polyphenylsulfone, polyethersulfone-polyalkylene oxide copolymers, polyphenylsulfone-polyalkyleneoxide copolymers, polyisobutylene, polyisobutylene succinic anhydride, polyisobutylene-polyalkyleneoxide copolymers, polyamide 6, polyvinylpyrrolidone, polyvinylpyrrolidone-polyvinylimidazole copolymers, polyvinylpyrrolidone-polyvinylactetate copolymers, maleinimide-vinylether copolymers, polyacrylamides, fluorinated polyacrylates, polyethylene-polyvinylalcohol copolymers, polyethylene-polyvinylacetate copolymers, polyvinylalcohol and polyvinylacetate copolymers, polyoxymethylene, polyvinylbutyral, polyureas, polymers based on photodepolymerization of acrolein derivatives (CH 2 ═CR—C(O)R), polysulfone-polyalkylene oxide copolymers, polyvinylidene difluoride, and combinations thereof;
a first protective layer disposed on the first release layer; and
a first electroactive material layer disposed on the first protective layer; and
an electrolyte, wherein the first release layer is a polymeric release layer, wherein the first release layer is soluble in the electrolyte, wherein the electrochemical system is configured such that assembly thereof into an electrochemical cell causes the electrolyte to contact the first release layer, and wherein the contact between the electrolyte and the first release layer causes the release layer to be dissolved in the electrolyte and thereby removed from the electrode structure.
2. The electrochemical system of claim 1 , wherein the first protective layer is substantially continuous.
3. The electrochemical system of claim 1 , wherein a mean peak to valley roughness of the first release layer is between about 0.1 μm and about 1 μm.
4. The electrochemical system of claim 1 , wherein a mean peak to valley roughness of an interface between the first protective layer and the first electroactive material layer is between about 0.1 μm and about 1 μm.
5. The electrochemical system of claim 1 , wherein a thickness of the first protective layer is greater than the mean peak to valley roughness of the first release layer.
6. The electrochemical system of claim 5 , wherein the thickness of the first protective layer is at least two times greater than the mean peak to valley roughness of the first release layer.
7. The electrochemical system of claim 1 , wherein a thickness of the first protective layer is between about 0.1 μm and about 5 μm.
8. The electrochemical system of claim 1 , wherein the first release layer comprises a material that is substantially amorphous.
9. The electrochemical system of claim 1 , wherein an adhesive strength between the first release layer and the first protective layer is greater than an adhesive strength between the first release layer and a first carrier substrate on which the first release layer is disposed.
10. The electrochemical system of claim 1 , further comprising an intermediate layer positioned between at least one of a first carrier substrate and the first release layer, the first release layer and the first protective layer, and the first protective layer and the first electroactive material layer.
11. The electrochemical system of claim 1 , wherein a mean peak to valley roughness of the first release layer is less than a mean peak to valley roughness of a first carrier substrate on which the first release layer is disposed.
12. The electrochemical system of claim 1 , further comprising a second electrode that is a cathode for an alkali metal ion battery.
13. The electrochemical system of claim 1 , wherein the first protective layer is a ceramic, a glassy-ceramic, or a glass layer.
14. The electrochemical system of claim 1 , wherein the first protective layer comprises at least one of lithium nitride, lithium silicate, lithium borate, lithium aluminate, lithium phosphate, lithium phosphorus oxynitride, lithium silicosulfide, lithium germanosulfide, a lithium oxide, a lithium lanthanum oxide, a lithium titanium oxide, lithium borosulfide, lithium aluminosulfide, and lithium phosphosulfide.
15. The electrochemical system of claim 1 , wherein the first protective layer is a multilayer protective layer.
16. The electrochemical system of claim 15 , wherein the multilayer protective layer comprises a polymer layer adjacent a single-ion conductive layer.
17. The electrochemical system of claim 1 , wherein the first release layer comprises a polyethylene-polyvinylalcohol copolymer.
18. The electrochemical system of claim 1 , wherein the first release layer consists essentially of one or more of the following materials: a polysulfone, polyethersulfone, polyphenylsulfone, a polyethersulfone-polyalkylene oxide copolymer, a polyphenylsulfone-polyalkyleneoxide copolymer, polyisobutylene, polyisobutylene succinic anhydride, a polyisobutylene-polyalkyleneoxide copolymer, polyamide 6, polyvinylpyrrolidone, a polyvinylpyrrolidone-polyvinylimidazole copolymer, a polyvinylpyrrolidone-polyvinylactetate copolymer, a maleinimide-vinylether copolymer, a polyacrylamide, a fluorinated polyacrylate, a polyethylene-polyvinylalcohol copolymer, a polyethylene-polyvinylacetate copolymer, a polyvinylalcohol and polyvinylacetate copolymer, polyoxymethylene, polyvinylbutyral, polyurea, a polymer based on photodepolymerization of an acrolein derivative (CH 2 ═CR—C(O)R), a polysulfone-polyalkylene oxide copolymer, polyvinylidene difluoride, and combinations thereof.
19. The electrochemical system of claim 1 , wherein the first release layer comprises a filler that makes up less than 10 wt % of the first release layer.
20. An electrochemical system, comprising:
an electrode structure, comprising:
a first release layer, comprising one or more of the following materials: polyimide with a hexafluoropropylene coating; siliconized polyester films, metallized polyester films, polybenzimidazoles, polybenzoxazoles, ethylene-acrylic acid copolymers, acrylate based polymers, polyvinylpyrrolidone-polyvinylimidazole copolymers, polyacrylonitriles, styrene-acrylonitriles, thermoplastic polyurethane polymers, polysulfone-polyalkylene oxide copolymers, benzophenone-modified polysulfone polymers, polyvinylpyrrolidone-polyvinylactetate copolymers, and combinations thereof;
a first protective layer disposed on the first release layer; and
a first electroactive material layer disposed on the first protective layer; and
an electrolyte, wherein the first release layer is a polymeric release layer, wherein the first release layer is soluble in the electrolyte, wherein the electrochemical system is configured such that assembly thereof into an electrochemical cell causes the electrolyte to contact the first release layer, and wherein the contact between the electrolyte and the first release layer causes the release layer to be dissolved in the electrolyte and thereby removed from the electrode structure.