Positive electrode active material for non-aqueous electrolyte secondary battery, process for manufacturing positive electrode active material for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery using the positive electrode active material

Patent metadata

Field	Value
Publication number	US-2020227732-A1
Application number	US-201816628956-A
Country	US
Kind code	A1
Filing date	Jun 27, 2018
Priority date	Jul 5, 2017
Publication date	Jul 16, 2020
Grant date	—

Abstract

A positive electrode active material for a non-aqueous electrolyte secondary battery includes a lithium metal composite oxide, wherein the lithium metal composite oxide is represented by a general formula: Li a Ni 1−x−y−z Co x D y E z O 2 (wherein, in the formula, 0.05≤x≤0.35, 0≤y≤0.35, 0.002≤z≤0.05, 1.00≤a≤1.30, an element D is at least one type of element selected from Mn, V, Mo, Nb, Ti, and W, and an element E is an element forming an alloy with lithium at a potential more noble than a potential in which ions of the element E are reduced), wherein the lithium metal composite oxide includes primary and secondary particles formed by aggregating the primary particles, wherein an oxide containing the element E exists at a surface of at least either of the primary and secondary particles.

First claim

1 . A positive electrode active material for a non-aqueous electrolyte secondary battery comprising a lithium metal composite oxide,
wherein the lithium metal composite oxide is represented by a general formula: Li a Ni 1−x−y−z Co x D y E z O 2 (wherein, in the formula, 0.05≤x≤0.35, 0≤y≤0.35, 0.002≤z≤0.05, 1.00≤a≤1.30, an element D is at least one type of element selected from Mn, V, Mo, Nb, Ti, and W, and an element E is an element forming an alloy with lithium at a potential more noble than a potential in which ions of the element E are reduced), wherein the lithium metal composite oxide comprises primary particles and secondary particles formed by aggregating the primary particles, wherein an oxide containing the element E exists at a surface of at least either of the primary particles and the secondary particles.

2 . The positive electrode active material for the non-aqueous electrolyte secondary battery according to claim 1 , wherein the element E is at least one type of element selected from Mg, Al, and Si.

3 . The positive electrode active material for the non-aqueous electrolyte secondary battery according to claim 1 , wherein a part of the element E is solid-solved in the primary particles or the secondary particles.

4 . A process for manufacturing a positive electrode active material for a non-aqueous electrolyte secondary battery comprising a lithium metal composite oxide, wherein the lithium metal composite oxide is represented by a general formula: Li a Ni 1−x−y−z Co x D y E z O 2 (wherein, in the formula, 0.05≤x≤0.35, 0≤y≤0.35, 0.002≤z≤0.05, 1.00≤a≤1.30, an element D is at least one type of element selected from Mn, V, Mo, Nb, Ti, and W, and an element E is an element forming an alloy with lithium at a potential more noble than a potential in which ions of the element E are reduced), wherein the lithium metal composite oxide comprises primary particles and secondary particles formed by aggregating the primary particles,
wherein the process comprising:
a crystallization step for crystallizing transition metal composite hydroxide particles by supplying and mixing an aqueous solution at least containing nickel and cobalt, an aqueous solution containing ammonium ion donor, and an alkaline solution, in a reaction tank;
a mixing step for mixing a transition metal composite hydroxide obtained by the crystallization step, a compound containing the element E, and a lithium compound;
a firing step for firing a lithium mixture obtained by the mixing step at a temperature of 700° C. to 1000° C. and forming the lithium metal composite oxide,
wherein an oxide containing the element E is formed at a surface of at least either of the primary particles and the secondary particles by the mixing step.

5 . The process for manufacturing the positive electrode active material for the non-aqueous electrolyte secondary battery according to claim 4 , wherein the element E is at least one type of element selected from Mg, Al, and Si.

6 . A non-aqueous electrolyte secondary battery comprising: a positive electrode; a negative electrode; a separator; and a non-aqueous electrolyte,
wherein the positive electrode includes the positive electrode active material for the non-aqueous electrolyte secondary battery described in claim 1 as constituent material, wherein the positive electrode active material for the non-aqueous electrolyte secondary battery comprises the lithium metal composite oxide represented by the general formula: Li a Ni 1−x−y−z Co x D y E z O 2 (wherein, in the formula, 0.05≤x≤0.35, 0≤y≤0.35, 0.002≤z≤0.05, 1.00≤a≤1.30, an element D is at least one type of element selected from Mn, V, Mo, Nb, Ti, and W, and an element E is an element forming an alloy with lithium at a potential more noble than a potential in which ions of the element E are reduced).

7 . The non-aqueous electrolyte secondary battery according to claim 6 , wherein an alloy of the element E and lithium exists at a surface of the negative electrode after charging and discharging.

8 . The non-aqueous electrolyte secondary battery according to claim 7 , wherein the element E contained in the negative electrode after charging and discharging is 50 mass ppm or more and 600 mass ppm or less with respect to the negative electrode.

9 . The positive electrode active material for the non-aqueous electrolyte secondary battery according to claim 2 , wherein a part of the element E is solid-solved in the primary particles or the secondary particles.

10 . A non-aqueous electrolyte secondary battery comprising: a positive electrode; a negative electrode; a separator; and a non-aqueous electrolyte,
wherein the positive electrode includes the positive electrode active material for the non-aqueous electrolyte secondary battery described in claim 2 as constituent material, wherein the positive electrode active material for the non-aqueous electrolyte secondary battery comprises the lithium metal composite oxide represented by the general formula: Li a Ni 1−x−y−z Co x D y E z O 2 (wherein, in the formula, 0.05≤x≤0.35, 0≤y≤0.35, 0.002≤z≤0.05, 1.00≤a≤1.30, an element D is at least one type of element selected from Mn, V, Mo, Nb, Ti, and W, and an element E is an element forming an alloy with lithium at a potential more noble than a potential in which ions of the element E are reduced).

11 . The non-aqueous electrolyte secondary battery according to claim 10 , wherein an alloy of the element E and lithium exists at a surface of the negative electrode after charging and discharging.

12 . The non-aqueous electrolyte secondary battery according to claim 11 , wherein the element E contained in the negative electrode after charging and discharging is 50 mass ppm or more and 600 mass ppm or less with respect to the negative electrode.

Assignees

• Sumitomo Metal Mining Co

Inventors

• Toma Takahiro
• Fukui Atsushi
• Aida Taira
• Komukai Tetsufumi

Classifications

• C01G53/82 Primary

  Compounds containing nickel, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• H01B1/08

  oxides · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/364 Primary

  as mixtures · CPC title

• C01P2006/40

  Electric properties · CPC title