Positive electrode active material and nonaqueous electrolyte secondary battery using the same
AssigneePrime Planet Energy & Solutions, Inc.
InventorsTakatoshi Higuchi, Akihiro Tabushi, Masaya Saito
Life of this patent
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Abstract
Provided is a positive electrode active material that can increase a volume capacity density of a positive electrode of a nonaqueous battery secondary battery and can provide the nonaqueous electrolyte secondary battery with high cycle characteristics. A positive electrode active material disclosed here includes monoparticulate first lithium composite oxide particles and secondary particulate second lithium composite oxide particles. An average particle size of the second lithium composite oxide particles is larger than an average particle size of the first lithium composite oxide particles. The second lithium composite oxide particles have a porosity of 0.9% to 4.0%.
Claims11
A positive electrode active material, comprising:
- monoparticulate first lithium composite oxide particles;
- and
- secondary particulate second lithium composite oxide particles, wherein
- an average particle size (D50) of the secondary particulate second lithium composite oxide particles is larger than an average particle size (D50) of the monoparticulate first lithium composite oxide particles,
- the secondary particulate second lithium composite oxide particles have a porosity of 0.9% to 4.0%,
- an average primary particle size of the secondary particulate second lithium composite oxide particles is 1.2 μm to 2.5 μm,
- a BET specific surface area of the secondary particulate second lithium composite oxide particles is 0.10 m2/g to 0.30 m2/g, and
- a BET specific surface area of the monoparticulate first lithium composite oxide particles is 0.50 m2/g to 0.85 m2/g.
A nonaqueous electrolyte secondary battery, comprising:
- a positive electrode;
- a negative electrode;
- and
- a nonaqueous electrolyte, wherein
- the positive electrode includes a positive electrode active material including monoparticulate first lithium composite oxide particles;
- and
- secondary particulate second lithium composite oxide particles,
- an average particle size (D50) of the secondary particulate second lithium composite oxide particles is larger than an average particle size (D50) of the monoparticulate first lithium composite oxide particles,
- the secondary particulate second lithium composite oxide particles have a porosity of 0.9% to 4.0%,
- an average primary particle size of the secondary particulate second lithium composite oxide particles is 1.2 μm to 2.5 μm,
- a BET specific surface area of the secondary particulate second lithium composite oxide particles is 0.10 m2/g to 0.30 m2/g, and
- a BET specific surface area of the monoparticulate first lithium composite oxide particles is 0.50 m2/g to 0.85 m2/g.
Dependencies are inferred from the claim text.