Electrode assemblies

Patent metadata

Field	Value
Publication number	US-2019190029-A1
Application number	US-201916276608-A
Country	US
Kind code	A1
Filing date	Feb 14, 2019
Priority date	Sep 22, 2016
Publication date	Jun 20, 2019
Grant date	—

Abstract

Provided herein is electrode assembly for a nonaqueous electrolyte secondary 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, and the at least one cathode comprises a cathode current collector and a cathode electrode layer, wherein each of the cathode and anode electrode layers independently has a void volume of less than 35%, and wherein each of the at least one cathode and anode independently has a peeling strength of 0.15 N/cm or more.

First claim

What is claimed is:

1 . An electrode for a lithium-ion battery, comprising a current collector and an electrode layer, wherein the current collector is in the form of a foil, sheet, or film, wherein the electrode layer has a void volume between 10% and 35%, and wherein the electrode has a peeling strength between 0.15 N/cm and 0.31 N/cm.

2 . The electrode of claim 1 , wherein the surface roughness of the current collector is 4 μm or less.

3 . The electrode of claim 1 , wherein the density of the electrode layer is from about 1.0 g/cm 3 to about 6.5 g/cm 3 .

4 . The electrode of claim 1 , wherein the density of the electrode layer is from about 1.0 g/cm 3 to about 3.0 g/cm 3 .

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

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

7 . The electrode of claim 1 , wherein the electrode layer comprises a cathode material or an anode material, a binder material and a conductive agent, and wherein the binder material in the electrode layer is 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.

8 . The electrode of claim 7 , wherein the binder material in the electrode layer is present in an amount from 2% to 10% by weight, based on the total weight of the electrode layer.

9 . The electrode of claim 7 , 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 Mn y 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.

10 . The electrode of claim 9 , wherein the cathode material is present in an amount from 60% to 99% by weight, based on the total weight of the electrode layer.

11 . The electrode of claim 7 , wherein the conductive agent in the electrode layer is selected from the group consisting of carbon, carbon black, graphite, expanded graphite, graphene, graphene nanoplatelets, carbon fibres, carbon nano-fibers, graphitized carbon flake, carbon tubes, carbon nanotubes, activated carbon, mesoporous carbon, and combinations thereof.

12 . The electrode of claim 11 , wherein the conductive agent in the electrode layer is present in an amount from 2% to 10% by weight, based on the total weight of the electrode layer.

13 . The electrode of claim 7 , 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.

14 . The electrode of claim 13 , wherein the anode material is present in an amount from 50% to 99% by weight, based on the total weight of the electrode layer.

15 . The electrode of claim 1 , wherein the current collector is stainless steel, titanium, nickel, aluminum, copper, or electrically-conductive resin.

16 . The electrode of claim 1 , wherein the electrode is a cathode and the current collector is an aluminum thin film.

17 . The electrode of claim 1 , wherein the electrode is an anode and the current collector is a copper thin film.

18 . The electrode of claim 1 , wherein the electrode has a water content of less than 20 ppm, based on the total weight of the electrode.

19 . The electrode of claim 1 , wherein the electrode has a water content of less than 10 ppm, based on the total weight of the electrode.

20 . A lithium battery comprising the electrode of claim 1 .

Assignees

• Grst Int Ltd

Inventors

• Ho Kam Piu
• Wang Ranshi
• Shen Peihua

Classifications

• H01M4/0404

  by coating on electrode collectors · CPC title

• H01M4/622

  being polymers · CPC title

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• H01M4/136

  Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title