Method for producing electrode for non-aqueous secondary battery

Patent metadata

Field	Value
Publication number	US-11715826-B2
Application number	US-202016910715-A
Country	US
Kind code	B2
Filing date	Jun 24, 2020
Priority date	Jun 25, 2019
Publication date	Aug 1, 2023
Grant date	Aug 1, 2023

Abstract

A method for producing an electrode for a non-aqueous secondary battery is provided, the method includes: mixing a compound containing lithium, a compound containing nickel, and barium titanate to obtain a mixture; heat-treating the mixture to obtain a first composition containing a lithium-transition metal composite oxide; preparing an electrode composition containing the first composition, a conductive aid, and a binder; and applying and compressing the electrode composition on a current collector to form an active material layer with a density of from 2.4 g/cm3 to 3.6 g/cm3 on the current collector.

First claim

What is claimed is:

1. A method for producing an electrode for a non-aqueous secondary battery, the method comprising:
preparing a nickel composite oxide containing nickel, cobalt, and at least one element M 1 selected from the group consisting of aluminium, manganese, and magnesium;
after the nickel composite oxide containing nickel, cobalt, and the at least one element M 1 is prepared, mixing the nickel composite oxide, a compound containing lithium, and BaTiO 3 to obtain a mixture, wherein the mixture contains BaTiO 3 in an amount of 0.5 mol % or more and 2 mol % or less with respect to the nickel composite oxide;
heat-treating the mixture to obtain a first composition containing a lithium-transition metal composite oxide;
preparing an electrode composition containing the first composition, a conductive aid, and a binder; and

applying and compressing the electrode composition on a current collector to form an active material layer with a density of from 2.4 g/cm 3 to less than 3.3 g/cm 3 on the current collector.

2. The method according to claim 1 , wherein the lithium-transition metal composite oxide has a chemical composition with a ratio of a number of moles of nickel to a total number of moles of metals other than lithium of less than 1.

3. The method according to claim 2 , wherein the heat-treating is carried out at a temperature of from 700° C. to 900° C.

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

5. The method according to claim 4 , wherein the heat-treating is carried out at a temperature of from 700° C. to 900° C.

6. The method according to claim 1 , wherein the lithium-transition metal composite oxide further contains at least one selected from the group consisting of aluminium, manganese, and magnesium, and wherein a ratio of a total number of moles of aluminium, manganese, and magnesium in the lithium-transition metal composite oxide to a total number of moles of metals other than lithium in the lithium-transition metal composite oxide is 0.35 or less.

7. The method according to claim 6 , wherein the heat-treating is carried out at a temperature of from 700° C. to 900° C.

8. The method according to claim 1 , wherein the lithium-transition metal composite oxide has a composition represented by formula (1):
Li p Ni x Co y M 1 z Ti v M 2 w O 2   (1)

wherein 0.95≤p≤1.5, 0<x<1, 0≤y<1, 0≤z≤0.35, 0.0001≤v≤0.02, 0≤w≤0.05, and x+y+z+v+w≤1; M 1 is at least one selected from the group consisting of Al, Mn, and Mg; and M 2 is at least one selected from the group consisting of Zr, W, Ta, Nb, and Mo.

9. The method according to claim 8 , wherein the heat-treating is carried out at a temperature of from 700° C. to 900° C.

10. The method according to claim 1 , wherein the heat-treating is carried out at a temperature of from 700° C. to 900° C.

11. The method according to claim 1 , wherein preparing the nickel composite oxide comprises:
preparing a mixed aqueous solution having a desired composition ratio of nickel ions, cobalt ions, and ions of element M 1 ;
contacting the mixed aqueous solution with an alkaline solution to obtain a precipitate containing nickel, cobalt, and M 1 ;
washing the precipitate with water and heat-treating the precipitate to obtain the nickel composite oxide.

Assignees

• Nichia Corp

Inventors

• Sawada Shunsuke
• Kanechika Hideyuki
• Murayama Masahiro

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

• H01M4/043

  involving compressing or compaction · CPC title

• H01M4/0471

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

• H01M4/131

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

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title