Method of producing positive electrode active material for nonaqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-2020106098-A1
Application number	US-201916702841-A
Country	US
Kind code	A1
Filing date	Dec 4, 2019
Priority date	Mar 31, 2016
Publication date	Apr 2, 2020
Grant date	—

Abstract

A method of producing a positive electrode active material for a nonaqueous electrolyte secondary battery, the method includes preparing nickel-containing composite oxide particles having a ratio 1D90/1D10 of a 90% particle size 1D90 to a 10% particle size 1D10 in volume-based cumulative particle size distribution of 3 or less; obtaining a raw material mixture containing the composite oxide particles and a lithium compound and having a ratio of a total number of moles of lithium to a total number of moles of metal elements contained in the composite oxide in a range of 1 to 1.3; subjecting the raw material mixture to a heat treatment to obtain a heat-treated material; subjecting the heat-treated material to a dry-dispersion treatment to obtain a first dispersion; and bringing the first dispersion into contact with a liquid medium to obtain a second dispersion.

First claim

1 . A method of producing a positive electrode active material for a nonaqueous electrolyte secondary battery, comprising:
preparing a raw material mixture containing nickel-containing composite oxide particles and a lithium compound, wherein said nickel-containing composite oxide particles have a ratio 1 D 90 / 1 D 10 of a 90% particle size 1 D 90 to a 10% particle size 1 D 10 in volume-based cumulative particle size distribution of 3 or less, and wherein said raw material mixture has a ratio of a total number of moles of lithium to a total number of moles of metal elements contained in the composite oxide in a range of 1 to 3; subjecting the raw material mixture to a heat treatment to obtain a heat-treated material; dissociating sintered material from the heat-treated material to obtain a first dispersion; and bringing the first dispersion into contact with a liquid medium to obtain a second dispersion, wherein the positive electrode active material includes lithium-transition metal composite oxide particles having a ratio 2 D 50 / 2 D SEM of a 50% particle size 2 D 50 in volume-based cumulative particle size distribution to an average particle size 2 D SEM based on electron microscopic observation in a range of 1 to 4, and wherein a molar ratio of nickel in a composition of the lithium-transition metal composite oxide to a total molar number of metals other than lithium is 0.6 or more and less than 0.95.

2 . The method according to claim 1 , wherein the lithium-transition metal composite oxide further contains cobalt and a molar ratio of cobalt in the composition to a total molar number of metals other than lithium is 0.4 or less.

3 . The method according to claim 1 , wherein the lithium-transition metal composite oxide further contains at least one of Mn or Al and a molar ratio of total molar number of Mn and Al in the composition to a total molar number of metals other than lithium is 0.5 or less.

4 . The method according to claim 1 , wherein a molar ratio of lithium in the composition to a total molar number of metals other than lithium is 1.0 to 1.3.

5 . The method according to claim 1 , wherein a molar ratio of oxygen in the composition to a total molar number of metals other than lithium is 1.9 to 2.1.

6 . The method according to claim 1 , wherein the lithium-transition metal composite oxide particles have a ratio 2 D 90 / 2 D 10 of a 90% particle size 2 D 90 to a 10% particle size 2 D 10 in volume-based cumulative particle size distribution of 4 or less.

7 . The method according to claim 1 , wherein the heat treatment of the raw material mixture includes heat-treating at a first temperature and heat-treating at a second temperature higher than the first temperature.

8 . The method according to claim 7 , wherein the heat treatment of the raw material mixture further includes, after heat-treating at the second temperature, heat-treating at a third temperature lower than the second temperature.

9 . The method according to claim 1 , wherein the heat treatment of the raw material mixture is performed in an oxygen-containing atmosphere.

10 . The method according to claim 1 , wherein, in the step of bringing the first dispersion into contact with a liquid medium, the mass ratio of the liquid medium to the first dispersion in a range of 2 mass % to 20 mass %.

11 . The method according to claim 1 , wherein the lithium-transition metal composite oxide particles have a ratio 2 D 90 / 2 D 10 of the 90% particle size 2 D 90 to the 10% particle size 2 D 10 in volume-based cumulative particle size distribution of 4 or less.

12 . The method according to claim 1 , wherein the ratio 2 D 50 / 2 D SEM of the 2 D 50 to the 2 D SEM is in a range of 1 to 3.

Assignees

• Nichia Corp

Inventors

• Kobayashi Kenichi

Classifications

• H01M4/525 Primary

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• C01P2004/51

  Particles with a specific particle size distribution · CPC title

• C01G53/40

  Complex oxides containing nickel and at least one other metal element · CPC title