Positive electrode active material for secondary battery, secondary battery, battery management unit, and electronic device

Patent metadata

Field	Value
Publication number	US-11728469-B2
Application number	US-202117316986-A
Country	US
Kind code	B2
Filing date	May 11, 2021
Priority date	Mar 3, 2016
Publication date	Aug 15, 2023
Grant date	Aug 15, 2023

Abstract

A lithium-ion secondary battery including a lithium-containing complex phosphate as a positive electrode active material is provided. Furthermore, a positive electrode active material with high diffusion rate of lithium ions is provided to provide a lithium-ion secondary battery with high output. A positive electrode active material of a lithium-ion secondary battery includes a first plate-like component and a second plate-like component, a third prismatic component between the first component and the second component, and a space between the first component and the second component.

First claim

What is claimed is:

1. A method for manufacturing a positive electrode active material of a lithium-ion battery, comprising the steps of:
dissolving a lithium compound in a solvent to form a solution containing lithium;
dissolving a phosphorus compound in a solvent to form a solution containing phosphorus;
dissolving an M(II) compound in a solvent to form a solution containing M(II), wherein M(II) is one or more of iron(II), manganese(II), cobalt(II), and nickel(II);
mixing the solution containing lithium and the solution containing phosphorus to form a first mixed solution in an air atmosphere;
adding the solution containing M(II) dropwise to the first mixed solution while stirring the first mixed solution so as to form a second mixed solution in an air atmosphere;
putting the second mixed solution into a container resistant to heat and pressure;
heating the second mixed solution;
cooling the second mixed solution; and
obtaining a solid by filtration of the cooled down second mixed solution.

2. The method for manufacturing a positive electrode active material of a lithium-ion battery according to claim 1 , further comprising the steps of:
washing the solid with water; and
drying the solid.

3. The method for manufacturing a positive electrode active material of a lithium-ion battery according to claim 1 ,
wherein the lithium compound is any one of lithium hydroxide-hydrate, lithium chloride, lithium carbonate, lithium acetate, and lithium oxalate.

4. The method for manufacturing a positive electrode active material of a lithium-ion battery according to claim 3 ,
wherein the solvent is water.

5. The method for manufacturing a positive electrode active material of a lithium-ion battery according to claim 1 ,
wherein the phosphorus compound is a phosphoric acid or ammonium hydrogenphosphate.

6. The method for manufacturing a positive electrode active material of a lithium-ion battery according to claim 1 ,
wherein the second mixed solution is heated at 100° C. to 350° C. at 0.1 MPa to 100 MPa for 0.5 to 24 hours.

7. The method for manufacturing a positive electrode active material of a lithium-ion battery according to claim 1 ,
wherein the solid is a lithium-containing complex phosphate having a single-crystal grain.

8. The method for manufacturing a positive electrode active material of a lithium-ion battery according to claim 1 ,
wherein the solid comprises an H-shaped particle.

9. The method for manufacturing a positive electrode active material of a lithium-ion battery according to claim 1 ,
wherein the lithium compound is any one of lithium hydroxide-hydrate, lithium chloride, lithium carbonate, lithium acetate, and lithium oxalate,
wherein the solvent is water,
wherein the phosphorus compound is a phosphoric acid or ammonium hydrogenphosphate, and
wherein the second mixed solution is heated at 100° C. to 350° C. at 0.1 MPa to 100 MPa for 0.5 to 24 hours.

10. A secondary battery comprising:
a positive electrode comprising the positive electrode active material according to claim 1 ;
a negative electrode; and
an electrolyte.

11. A method for manufacturing a positive electrode active material of a lithium-ion battery, comprising the steps of:
forming a first solution containing lithium and phosphorus;
forming a second solution containing M(II), wherein M(II) is one or more of iron(II), manganese(II), cobalt(II), and nickel(II);
adding the second solution dropwise to the first solution while stirring the first solution so as to form a second mixed solution in an air atmosphere;
putting the second mixed solution into a container resistant to heat and pressure;
heating the second mixed solution;
cooling the second mixed solution; and
obtaining a solid by filtration of the cooled down second mixed solution.

Assignees

• Semiconductor Energy Lab

Inventors

• Oguni Teppei
• Miwa Takuya

Classifications

• H01M4/136 Primary

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

• C01B25/45 Primary

  containing plural metal, or metal and ammonium · CPC title

• H01M4/366

  as layered products · CPC title

• H01M4/5825

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• H01M10/0525

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