ELECTRICAL INSULATION LAYER AND BATTERY DEVICE
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.
1 . A battery device comprising:
a cathode;
an anode;
an electrical insulation layer comprising microparticles and having a mesoporous structure, the electrical insulation layer being arranged between the anode and the cathode; and
an ion conductive composition.
2 . The battery device 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 battery device 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 battery device according to claim 1 , wherein the electrical insulation layer further comprises nanoparticles, wherein at least one of the microparticles and the nanoparticles has a mesoporous structure.
5 . The battery device according to claim 1 , wherein the electrical insulation layer further comprises a binder.
6 . The battery device according to claim 1 , wherein the ion conductive composition comprises a lithium salt and a non-aqueous solvent.
7 . The battery device according to claim 6 , 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.
8 . The battery device according to claim 7 , 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.
9 . The battery device according to claim 7 , 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.
10 . The battery device according to claim 6 , wherein the non-aqueous solvent comprises a nitrile solvent.
11 . The battery device according to claim 10 , wherein the nitrile solvent comprises at least one member selected from the group consisting of succinonitrile, glutaronitrile and adiponitrile.
12 . The battery device according to claim 10 , wherein the amount of the nitrile solvent based on the total amount of the non-aqueous solvent is 50 vol % or more.
13 . The battery device according to claim 1 , wherein the microparticles comprise particles of at least one member selected from the group consisting of polymethylurea, 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 ).
14 . The battery device according to claim 4 , wherein the nanoparticles comprise particles of at least one member selected from the group consisting of silicon dioxide (SiO 2 ), aluminum oxide (Al 2 O 3 ), 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.
15 . The battery device according to claim 5 , wherein the binder 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, lithium polyacrylate, poly(methyl methacrylate), poly(butyl acrylate), ethyl hydroxyethyl cellulose, styrene-butadiene resin, carboxymethyl cellulose, polyimide, polyacrylonitrile, polyurethane, ethyl-vinyl acetate copolymer and polyester.
16 . The battery device according to claim 1 , wherein the electrical insulation layer is formed on a surface of at least the anode or the cathode.