Positive electrode active material for lithium ion secondary battery and lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-12500233-B2
Application number	US-202017625859-A
Country	US
Kind code	B2
Filing date	Jun 30, 2020
Priority date	Jul 8, 2019
Publication date	Dec 16, 2025
Grant date	Dec 16, 2025

Abstract

The positive electrode active material for a lithium ion secondary battery contains a lithium-nickel-manganese composite oxide, in which metal elements constituting the lithium-nickel-manganese composite oxide include lithium (Li), nickel (Ni), manganese (Mn), cobalt (Co), titanium (Ti), niobium (Nb), and optionally zirconium (Zr), an amount of substance ratio of the elements is represented as Li: Ni: Mn: Co: Zr: Ti: Nb =a: b: c: d: e: f: g (provided that, 0.97≤a≤1.10, 0.80≤b≤0.88, 0.04≤c≤0.12, 0.04≤d≤0.10, 0≤e≤0.004, 0.003<f≤0.030, 0.001<g≤0.006, and b+c+d+e+f+g=1), and in the amount of substance ratio, (f+g)≤0.030 and f>g are satisfied.

First claim

The invention claimed is:

1 . A positive electrode active material for a lithium ion secondary battery, the positive electrode active material comprising a lithium-nickel-manganese composite oxide having a hexagonal layered structure and configured by secondary particles with a plurality of aggregated primary particles,
wherein metal elements constituting the lithium-nickel-manganese composite oxide include lithium (Li), nickel (Ni), manganese (Mn), cobalt (Co), titanium (Ti), niobium (Nb), and optionally zirconium (Zr), an amount of substance ratio of the metal elements is represented as Li:Ni:Mn:Co:Zr:Ti:Nb=a:b:c:d:e:f:g wherein 0.97≤a≤1.10, 0.80≤b≤0.88, 0.04≤c≤0.12, 0.04≤d≤0.10, 0≤e≤0.004, 0.003<f≤0.030, 0.001<g≤0.006, and b+c+d+e+f+g=1, in the amount of substance ratio, (f+g)≤0.030 and f>g are satisfied, niobium is segregated at a grain boundary between primary particles of the lithium-nickel-manganese composite oxide, a niobium concentration at the grain boundary between primary particles, as determined by point analysis using STEM-EDX, with respect to a niobium concentration inside primary particles of the lithium-nickel-manganese composite oxide is 1.3 times or more, a titanium concentration at the grain boundary between primary particles, as determined by point analysis using STEM-EDX, with respect to a titanium concentration inside primary particles of the lithium-nickel-manganese composite oxide is less than 1.3 times, and a volume resistivity, as determined by powder resistivity measurement, when compressed to 4.0 g/cm 3 is 5.0×10 2 Ω·cm or more and 1.0×10 5 Ω·cm or less.

2 . The positive electrode active material for a lithium ion secondary battery according to claim 1 , wherein the amount of substance ratio of the metal elements is represented as Li:Ni:Mn:Co:Zr:Ti:Nb=a:b:c:d:e:f:g wherein 0.97≤a≤1.10, 0.80≤b≤0.88, 0.04≤c≤0.12, 0.04≤d≤0.10, 0≤e≤0.004, 0.003<f≤0.030, 0.003≤g≤0.006, and b+c+d+e+f+g=1.

3 . The positive electrode active material for a lithium ion secondary battery according to claims 1 , wherein [(D90−D10)/Mv] indicating a particle size distribution width calculated by D90, D10 and a volume average particle size (Mv) in a particle size distribution by a laser diffraction scattering method is 0.80 or more and 1.20 or less.

4 . The positive electrode active material for a lithium ion secondary battery according to claims 1 , wherein a volume average particle size Mv is 8 μm or more and 20 μm or less.

5 . A lithium ion secondary battery comprising: a positive electrode; a negative electrode; and a non-aqueous electrolyte, the positive electrode containing the positive electrode active material for a lithium ion secondary battery according to claims 1 .

Assignees

• Sumitomo Metal Mining Co
• Panasonic Corp
• Panasonic Holdings Corp

Inventors

• Koshika Yuki
• KANEDA Haruki
• Tsuruta Sho
• Ko Takashi
• Niina Fumiharu

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/505

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

• H01M4/131

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