Positive electrode active material for non-aqueous electrolyte secondary battery and method for producing the same, and non-aqueous electrolyte secondary battery and method for producing the same

Patent metadata

Field	Value
Publication number	US-2020313180-A1
Application number	US-201816641864-A
Country	US
Kind code	A1
Filing date	Aug 23, 2018
Priority date	Aug 25, 2017
Publication date	Oct 1, 2020
Grant date	—

Abstract

The positive electrode active material is for a non-aqueous electrolyte secondary battery, suppressing deterioration of battery characteristics due to exposure to the atmosphere and having excellent battery capacity. A positive electrode active material for a non-aqueous electrolyte secondary battery includes a lithium-nickel composite oxide represented by general formula (1): Li a Ni 1-x-y Co x M y O 2+α (in which 0.05≤x≤0.35, 0≤y≤0.10, 0.95≤a≤1.10, 0≤a≤0.2, and M represents at least one element selected from Mn, V, Mg, Mo, Nb, Ti, W, and Al) and Li 3 BO 3 . At least a part of a surface of the lithium-nickel composite oxide is coated with Li 3 BO 3 . The content of boron in the positive electrode active material is 0.001% by mass or more and 0.2% by mass or less with respect to the entire positive electrode active material.

First claim

1 . A positive electrode active material for a non-aqueous electrolyte secondary battery, comprising a lithium-nickel composite oxide represented by general formula (1): Li a Ni 1-x-y Co x M y O 2+α (in which 0.05≤x≤0.35, 0≤y≤0.10, 0.95≤a≤1.10, 0≤α≤0.2, and M represents at least one element selected from Mn, V, Mg, Mo, Nb, Ti, W, and Al) and Li 3 BO 3 , wherein at least a part of a surface of the lithium-nickel composite oxide is coated with Li 3 BO 3 , and a content of boron in the positive electrode active material is 0.001% by mass or more and 0.2% by mass or less with respect to the entire positive electrode active material.

2 . The positive electrode active material for a non-aqueous electrolyte secondary battery according to claim 1 , wherein at least a part of a surface of the lithium-nickel composite oxide is coated with Li 3 BO 3 alone.

3 . A method for producing a positive electrode active material for a non-aqueous electrolyte secondary battery, comprising a lithium-nickel composite oxide represented by general formula (1): Li a Ni 1-x-y Co x M y O 2+α (in which 0.05≤x≤0.35, 0≤y≤0.10, 0.95≤a≤1.10, 0≤α≤0.2, and M represents at least one element selected from Mn, V, Mg, Mo, Nb, Ti, W, and Al) and Li 3 BO 3 , the method comprising:
mixing a boron compound, at least one of a nickel composite hydroxide and a nickel composite oxide, and a lithium compound to obtain a lithium mixture; and
firing the lithium mixture in an oxygen atmosphere at a temperature of 715° C. or higher and 850° C. or lower to obtain a lithium-nickel composite oxide, wherein
the boron compound is mixed in an amount such that the content of boron is 0.001% by mass or more and 0.2% by mass or less with respect to the entire positive electrode active material, and
at least a part of a surface of the obtained lithium-nickel composite oxide is coated with Li 3 BO 3 .

4 . The method for producing a positive electrode active material for a non-aqueous electrolyte secondary battery according to claim 3 , wherein the boron compound contains at least one selected from H 3 BO 3 , B 2 O 3 , and LiBO 2 .

5 . The method for producing a positive electrode active material for a non-aqueous electrolyte secondary battery according to claim 3 , wherein the lithium compound contains lithium hydroxide.

6 . The method for producing a positive electrode active material for a non-aqueous electrolyte secondary battery according to claim 3 , wherein at least a part of a surface of the lithium-nickel composite oxide is coated with Li 3 BO 3 alone.

7 . 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 according to claim 1 .

8 . A method for producing a non-aqueous electrolyte secondary battery, comprising assembling the non-aqueous electrolyte secondary battery according to claim 7 in the atmosphere.

Assignees

• Sumitomo Metal Mining Co

Inventors

• Ryoshi Kazuomi
• Saruwatari Motoaki
• Oshita Hiroko
• Otsuka Yoshihiro

Classifications

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• H01M10/052

  Li-accumulators · CPC title

• C01B35/121

  of alkali metal · CPC title

• C01P2004/80

  Particles consisting of a mixture of two or more inorganic phases · CPC title

• C01P2006/40

  Electric properties · CPC title