Cathode active material for non-aqueous electrolyte secondary battery, manufacturing method thereof, and non-aqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-2018159117-A1
Application number	US-201815890248-A
Country	US
Kind code	A1
Filing date	Feb 6, 2018
Priority date	Feb 9, 2010
Publication date	Jun 7, 2018
Grant date	—

Abstract

A non-aqueous electrolyte secondary battery is provided that has both good safety and durability characteristics while at the same time has high charge/discharge capacity. The cathode active material for a non-aqueous electrolyte secondary battery of the present invention is a lithium nickel composite oxide to which at least two or more kinds of metal elements including aluminum are added, and comprises secondary particles that are composed of fine secondary particles having an average particle size of 2 μm to 4 μm, and rough secondary particles having an average particle size of 6 μm to 15 μm, with an overall average particle size of 5 μm to 15 μm; where the aluminum content of fine secondary particles (metal mole ratio: SA) is greater than the aluminum content of rough secondary particles (metal mole ratio: LA), and preferably the aluminum concentration ratio (SA/LA) is within the range 1.2 to 2.6.

First claim

1 - 8 . (canceled)

9 . A manufacturing method for a cathode active material for a non-aqueous electrolyte secondary battery comprising steps of:
adding and mixing an aluminum compound with a nickel composite hydroxide; performing oxidizing roasting of the obtained nickel composite hydroxide that contains aluminum; further adding and mixing a lithium compound with the obtained nickel composite oxide that contains aluminum; and baking the obtained mixture to obtain a cathode active material for a non-aqueous electrolyte secondary battery composed of a lithium nickel composite oxide; wherein, in the step of adding and mixing an aluminum compound with the nickel composite hydroxide, the aluminum compound is added and mixed with the nickel composite hydroxide composed of fine secondary particles having an average particle size of 2 μm to 4 μm and having a particle size distribution according to laser diffraction scattering measurement of 0.5 μm to 6 μm, and the nickel composite hydroxide composed of rough secondary particles having an average particle size of 6 μm to 15 μm and having a particle size distribution according to laser diffraction scattering measurement of 3 μm to 25 μm, so that a ratio of the aluminum content expressed as a metal mole ratio of the fine secondary particles with respect to a ratio of the aluminum content expressed as a metal mole ratio of the rough secondary particles is within the range 1.12 to 2.6; to obtain a nickel composite oxide that contains aluminum composed of secondary particles having an overall average particle size of 5 μm to 15 μm.

10 . The manufacturing method for a cathode active material for a non-aqueous electrolyte secondary battery according to claim 9 , wherein the lithium nickel composite oxide is represented by the general formula: Li w Ni 1-x-y-z Co x Al y M z O 2 (M is at least one kind of element selected from the group of Mn, Ti, Ca, Mg, Nb, Si, Zr and W (Tungsten), and 0.99≤w≤1.10, 0.05≤x≤0.30, 0.035≤y≤0.1, 0≤z≤0.01).

11 . The manufacturing method for a cathode active material for a non-aqueous electrolyte secondary battery according to claim 9 , wherein the ratio is within a range of 1.2 to 2.6.

12 . The manufacturing method for a cathode active material for a non-aqueous electrolyte secondary battery according to claim 9 , wherein a volume ratio of mixed fine secondary particles is 1% to 10% by volume with respect to the overall lithium nickel composite oxide.

13 . The manufacturing method for a cathode active material for a non-aqueous electrolyte secondary battery according to claim 10 , wherein a composition ratio of Al for the fine secondary particles is within a range of 0.03 to 0.1, and a composition ratio of Al for the rough secondary particles is within a range of 0.01 to 0.05, subject to satisfying that the ratio of the fine secondary particles to the aluminum content of the rough secondary particles is within the range of 1.12 to 2.6, such that the value “y” of composition ratio of Al after mixing of the fine secondary particles and the rough secondary particles becomes within a range of 0.035 to 0.1.

Assignees

• Sumitomo Metal Mining Co
• Toyota Motor Co Ltd

Inventors

• Oda Syuhei
• Toya Hiroyuki
• Kase Katsuya
• Oyama Yutaka

Classifications

• H01M4/505

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

• 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

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01B1/08

  oxides · CPC title

• H01M4/139

  Processes of manufacture · CPC title