Method for producing positive electrode active material layer for lithium ion battery, and positive electrode active material layer for lithium ion battery

Patent metadata

Field	Value
Publication number	US-2016064729-A1
Application number	US-201514828135-A
Country	US
Kind code	A1
Filing date	Aug 17, 2015
Priority date	Aug 29, 2014
Publication date	Mar 3, 2016
Grant date	—

Abstract

To provide a method for producing a positive electrode active material layer for lithium ion battery that can improve durability and internal resistance of lithium ion battery, and particularly lithium ion battery that operates at high voltage. The method for producing positive electrode active material layer for a lithium ion battery includes coating a substrate with positive electrode mixture slurry containing positive electrode active material, first lithium salt, second lithium salt and solvent, and drying off the solvent. First lithium salt is lithium phosphate, the second lithium salt is selected from the group including of lithium carbonate, lithium hydroxide, lithium nitrate, lithium acetate, lithium sulfate and combinations thereof, and the proportion of the second lithium salt with respect to the first lithium salt is 1 to 50 mol % based on the number of lithium atoms.

First claim

1 . A method for producing a positive electrode active material layer for a lithium ion battery,
wherein the method comprises coating a substrate with a positive electrode mixture slurry containing a positive electrode active material, a first lithium salt, a second lithium salt and a solvent, and drying off the solvent, wherein the first lithium salt is lithium phosphate, wherein the second lithium salt is selected from the group consisting of lithium carbonate, lithium hydroxide, lithium nitrate, lithium acetate, lithium sulfate and combinations thereof, and wherein the proportion of the second lithium salt with respect to the first lithium salt is 1 to 50 mol % based on the number of lithium atoms.

2 . The method according to claim 1 , wherein the second lithium salt is selected from the group consisting of lithium carbonate, lithium hydroxide and combinations thereof.

3 . The method according to claim 1 , wherein the positive electrode mixture slurry contains the first lithium salt at a proportion of 0.5 to 10.0 wt % with respect to the positive electrode active material.

4 . The method according to claim 1 , wherein the positive electrode active material is a nickel-manganese spinel-based positive electrode active material.

5 . A positive electrode active material layer for a lithium ion battery produced by the method according to claim 1 .

6 . A lithium ion battery having a positive electrode collector, a positive electrode active material layer for a lithium ion battery according to claim 5 , a separator, a negative electrode active material layer and a negative electrode collector, stacked in that order, and having a non-aqueous electrolyte solution impregnated into the positive electrode active material layer, the separator and the negative electrode active material layer.

7 . A lithium ion battery according to claim 6 , wherein the open voltage has a range of 4.3 V or greater.

8 . The method according to claim 2 , wherein the positive electrode mixture slurry contains the first lithium salt at a proportion of 0.5 to 10.0 wt % with respect to the positive electrode active material.

9 . The method according to claim 2 , wherein the positive electrode active material is a nickel-manganese spinel-based positive electrode active material.

10 . The method according to claim 3 , wherein the positive electrode active material is a nickel-manganese spinel-based positive electrode active material.

11 . A positive electrode active material layer for a lithium ion battery produced by the method according to claim 2 .

12 . A positive electrode active material layer for a lithium ion battery produced by the method according to claim 3 .

13 . A positive electrode active material layer for a lithium ion battery produced by the method according to claim 4 .

Assignees

• Toyota Motor Co Ltd

Inventors

• Shindo Yohei

Classifications

• H01M4/0404 Primary

  by coating on electrode collectors · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/1391

  of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/0471

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

• H01M10/0525

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