Electrode assemblies

Patent metadata

Field	Value
Publication number	US-10923760-B2
Application number	US-201615272494-A
Country	US
Kind code	B2
Filing date	Sep 22, 2016
Priority date	Sep 22, 2016
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

Provided herein is an electrode assembly of lithium-ion battery, comprising at least one anode, at least one cathode and at least one separator interposed between the at least one anode and at least one cathode, wherein the water content of the electrode assembly is less than 20 ppm by weight, based on the total weight of the electrode assembly.

First claim

What is claimed is:

1. An electrode assembly for a lithium-ion battery, comprising at least one anode, at least one cathode and at least one separator interposed between the at least one anode and at least one cathode, wherein the at least one anode comprises an anode current collector and an anode electrode layer comprising an anode material and a binder material, and the at least one cathode comprises a cathode current collector and a cathode electrode layer comprising a cathode material and a binder material;
wherein each of the cathode and anode electrode layers independently has a void volume between 10% and 35%, based on the total volume of the electrode layer;
wherein the amount of each of the binder materials is independently at least 3% by weight, based on the total weight of the electrode layer;
wherein the at least one separator is made of polymeric fibers selected from the group consisting of polyamide, polycarbonate, polyimide, polyetherether ketone, polysulfones, polyphenylene oxide, polyphenylene sulfide, polyacrylonitrile, polyvinyl pyrrolidone, polyester, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalene, polybutylene naphthalate, and combinations thereof;
wherein the water content of the electrode assembly is less than 20 ppm by weight, based on the total weight of the electrode assembly;
wherein the cathode electrode layer and the anode electrode layer each further comprises only one conductive agent independently selected from the group consisting of carbon, carbon black, graphite, expanded graphite, graphene, graphene nanoplatelets, carbon fibers, carbon nano-fibers, graphitized carbon flake, carbon tubes, carbon nanotubes, activated carbon and mesoporous carbon;
wherein the density of each of the cathode and anode electrode layers is independently from 1.0 g/cm 3 to 6.5 g/cm 3 , and
wherein each of the binder materials is independently selected from the group consisting of styrene-butadiene rubber, acrylated styrene-butadiene rubber, acrylonitrile copolymer, acrylonitrile-butadiene rubber, nitrile butadiene rubber, acrylonitrile-styrene-butadiene copolymer, acryl rubber, butyl rubber, fluorine rubber, polytetrafluoroethylene, polyethylene, polypropylene, ethylene/propylene copolymers, polybutadiene, polyethylene oxide, chlorosulfonated polyethylene, polyvinylpyrrolidone, polyvinylpyridine, polyvinyl alcohol, polyvinyl acetate, polyepichlorohydrin, polyphosphazene, polyacrylonitrile, polystyrene, latex, acrylic resins, phenolic resins, epoxy resins, carboxymethyl cellulose, hydroxypropyl cellulose, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethylcellulose, cyanoethylsucrose, polyester, polyamide, polyether, polyimide, polycarboxylate, polycarboxylic acid, polyacrylic acid, polyacrylate, polymethacrylic acid, polymethacrylate, polyacrylamide, polyurethane, fluorinated polymer, chlorinated polymer, a salt of alginic acid, polyvinylidene fluoride, poly(vinylidene fluoride)-hexafluoropropene, and combinations thereof.

2. The electrode assembly of claim 1 , wherein the density of each of the cathode and anode electrode layers is independently from 1.0 g/cm 3 to 3.0 g/cm 3 .

3. The electrode assembly of claim 1 , wherein the thickness of each of the cathode and anode electrode layers is independently from 1.0 μm to 40 μm.

4. The electrode assembly of claim 1 , wherein the thickness of each of the cathode and anode electrode layers is independently from 1.0 μm to 25 μm.

5. The electrode assembly of claim 1 , wherein the thickness of the separator is from about 1.0 μm to about 40 μm.

6. The electrode assembly of claim 1 , wherein the thickness of the separator is from about 1.0 μm to about 25 μm.

7. The electrode assembly of claim 1 , wherein each of the binder materials in the cathode and anode electrode layers is independently present in an amount from 3% to 10% by weight, based on the total weight of the electrode layer.

8. The electrode assembly of claim 1 , wherein the cathode material is selected from the group consisting of LiCoO 2 , LiNiO 2 , LiNi x Mn y O 2 , Li 1+z Ni x Co 1−x−y O 2 , LiNi x Co y Al z O 2 , LiV 2 O 5 , LiTiS 2 , LiMoS 2 , LiMnO 2 , LiCrO 2 , LiMn 2 O 4 , LiFeO 2 , LiFePO 4 , and combinations thereof, wherein each x is independently from 0.3 to 0.8; each y is independently from 0.1 to 0.45; and each z is independently from 0 to 0.2.

9. The electrode assembly of claim 1 , wherein each of the conductive agents in the cathode and anode electrode layers is independently present in an amount from 2% to 10% by weight, based on the total weight of the electrode layer.

10. The electrode assembly of claim 1 , wherein the anode material is selected from the group consisting of natural graphite particulate, synthetic graphite particulate, Sn particulate, Li 4 Ti 5 O 12 particulate, Si particulate, Si—C composite particulate, and combinations thereof.

11. The electrode assembly of claim 1 , wherein each of the current collectors of the at least one cathode and anode is independently stainless steel, titanium, nickel, aluminum, copper, or electrically-conductive resin.

12. The electrode assembly of claim 1 , wherein the current collector of the at least one cathode is an aluminum film, and wherein the current collector of the at least one anode is a copper film.

13. The electrode assembly of claim 1 , wherein the at least one anode and at least one cathode in the electrode assembly have a water content of less than 20 ppm by weight, based on the total weight of the at least one anode and at least one cathode.

14. The electrode assembly of claim 1 , wherein the at least one separator in the electrode assembly has a water content of less than 20 ppm by weight, based on the total weight of the at least one separator.

15. A lithium-ion battery comprising the electrode assembly of claim 1 .

Assignees

• Grst Int Ltd

Inventors

• Ho Kam Piu
• Wang Ranshi
• Shen Peihua

Classifications

• H01M50/489

  Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties · CPC title

• H01M50/414

  Synthetic resins, e.g. thermoplastics or thermosetting resins · CPC title

• H01M50/44

  Fibrous material · CPC title

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/0404

  by coating on electrode collectors · CPC title