Electrical insulation layer and battery device

Patent metadata

Field	Value
Publication number	US-9853269-B2
Application number	US-201414556449-A
Country	US
Kind code	B2
Filing date	Dec 1, 2014
Priority date	Dec 3, 2013
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

An electrical insulation layer including microparticles and having a mesoporous structure; and a battery device including a cathode, an anode, an electrical insulation layer including microparticles and having a mesoporous structure, the electrical insulation layer being arranged between the anode and the cathode, and an ion conductive composition.

First claim

What is claimed is:

1. An electrical insulation layer having a mesoporous structure and comprising:
microparticles having an average particle diameter of 0.5 μm to 40 μm,
nanoparticles having an average particle diameter of 3 nm to less than 500 nm,
a binder, and
an ion conductive composition;
wherein said microparticles comprise particles of polymethylurea, said nanoparticles comprise particles of aluminum oxide, and said binder comprises lithium polyacrylate.

2. The electrical insulation layer according to claim 1 , wherein the proportion of pores based on the total volume of the electrical insulation layer is 30 to 90 vol %.

3. The electrical insulation layer according to claim 1 , wherein the proportion of mesopores based on the total volume of the electrical insulation layer is 3 to 65 vol %.

4. The electrical insulation layer according to claim 1 , wherein at least one of the microparticles and the nanoparticles has a mesoporous structure.

5. A battery device comprising:
a cathode;
an anode;
an electrical insulation layer of claim 1 , having a mesoporous structure, the electrical insulation layer being arranged between the anode and the cathode; and
an ion conductive composition;
wherein at least one of the microparticles and the nanoparticles has a mesoporous structure.

6. The battery device according to claim 5 , wherein the proportion of pores based on the total volume of the electrical insulation layer is 30 to 90 vol %.

7. The battery device according to claim 5 , wherein the proportion of mesopores based on the total volume of the electrical insulation layer is 3 to 65 vol %.

8. The battery device according to claim 5 , wherein the ion conductive composition comprises a lithium salt and a non-aqueous solvent.

9. The battery device according to claim 8 , wherein the lithium salt comprises an organic acid lithium-boron trifluoride complex represented by general formula (I) or (II) shown below:
[R(COO) n − Li n ]—BF 3n   (I)

[(COO) 2 − Li 2 ]—(BF 3 ) 2   (II)

wherein R represents a hydrocarbon group having a valency of n or a hydride group; and n represents an integer of 1 to 4.

10. The battery device according to claim 9 , wherein the organic acid lithium-boron trifluoride complex comprises at least one member selected from the group consisting of a lithium oxalate-boron trifluoride complex, a lithium succinate-boron trifluoride complex and a lithium formate-boron trifluoride complex.

11. The battery device according to claim 9 , wherein the amount of the organic acid lithium-boron trifluoride complex based on the total amount of the lithium salt is 0.5 mol % or more.

12. The battery device according to claim 8 , wherein the non-aqueous solvent comprises a nitrile solvent.

13. The battery device according to claim 12 , wherein the nitrile solvent comprises at least one member selected from the group consisting of succinonitrile, glutaronitrile and adiponitrile.

14. The battery device according to claim 12 , wherein the amount of the nitrile solvent based on the total amount of the non-aqueous solvent is 50 vol % or more.

15. The battery device according to claim 5 , wherein the microparticles further comprise particles of at least one member selected from the group consisting of melamine formaldehyde resin, lithium polyacrylate, polyamide, poly(lithium 2-acrylamido-2-methylpropanesulfonate), silicon dioxide (SiO 2 ), aluminum oxide (Al 2 O 3 ), pseudoboehmite (AlO(OH)), titanium dioxide (TiO 2 ), zinc oxide (ZnO), potassium fluoride (KF), lithium fluoride (LiF), zeolite and calcium carbonate (CaCO 3 ).

16. The battery device according to claim 5 , wherein the nanoparticles further comprise particles of at least one member selected from the group consisting of silicon dioxide (SiO 2 ), pseudoboehmite (AlO(OH)), niobium oxide (Nb 2 O 5 ), tantalum oxide (Ta 2 O 5 ), titanium dioxide (TiO 2 ), zirconium oxide (ZrO 2 ), tin dioxide (SnO 2 ), zinc oxide (ZnO), potassium fluoride (KF), lithium fluoride (LiF), mesoporous aluminosilicate (Al 2 SiO 5 ), a mesoporous niobium-tantalum composite oxide and a mesoporous magnesium-tantalum composite oxide.

17. The battery device according to claim 5 , wherein the binder further comprises at least one member selected from the group consisting of polyvinyl alcohol, carboxyl group-modified polyvinyl alcohol, polyvinyl pyrrolidone, polyethylene oxide, polypropylene oxide, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyacrylic acid, poly(methyl methacrylate), poly(butyl acrylate), ethyl hydroxyethyl cellulose, styrene-butadiene resin, carboxymethyl cellulose, polyimide, polyacrylonitrile, polyurethane, ethyl-vinyl acetate copolymer and polyester.

18. The battery device according to claim 5 , wherein the electrical insulation layer is formed on a surface of at least the anode or the cathode.

Assignees

• Sekisui Chemical Co Ltd
• Univ Massachusetts
• Univ Massachusetts

Inventors

• Tang Yuying
• Watkins James
• Shinmei Kenichi
• Dasanayake Aluthge Rasika
• Koizumi Susumu
• Kanoh Masashi

Classifications

• H01M10/0568 Primary

  characterised by the solutes · CPC title

• H01M2300/0028

  characterised by the solvent · CPC title

• H01M10/0525 Primary

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

• H01M10/0569

  characterised by the solvents · CPC title

• H01M50/497

  Ionic conductivity · CPC title