US2022223863A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2022223863-A1 |
| Application number | US-202217572632-A |
| Country | US |
| Kind code | A1 |
| Filing date | Jan 11, 2022 |
| Priority date | Jan 14, 2021 |
| Publication date | Jul 14, 2022 |
| Grant date | — |
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Provided is a graphite-based negative electrode active material that can impart both high output characteristics and high cycle characteristics to a nonaqueous electrolyte secondary battery. The graphite-based negative electrode active material disclosed herein is made up of particles having, in a cross-sectional view, a flat central portion made up of graphite, and a porous accumulation portion made up of accumulated graphite, on both sides of the flat central portion. The graphite that makes up the flat central portion is present more densely than the graphite that makes up the porous accumulation portion.
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What is claimed is: 1 . A graphite-based negative electrode active material made up of particles which comprise, in a cross-sectional view, a flat central portion made up of graphite; and a porous accumulation portion made up of accumulated graphite, on both sides of the flat central portion; wherein the graphite that makes up the flat central portion is present more densely than the graphite that makes up the porous accumulation portion. 2 . The graphite-based negative electrode active material according to claim 1 , wherein an average aspect ratio of the flat central portion is not less than 1.8 but not more than 12. 3 . The graphite-based negative electrode active material according to claim 1 , wherein a pore volume for a range of pore diameter from 0.01 μm to 0.1 μm is not less than 0.025 mL/g but not more than 0.045 mL/g. 4 . The graphite-based negative electrode active material according to claim 1 , wherein a ratio of the thickness of the porous accumulation portion relative to a minor diameter of the flat central portion is not less than 1.25 but not more than 2.5. 5 . A method for producing a graphite-based negative electrode active material, the method comprising: mixing two types of scaly graphite having different average particle sizes; and composing the two types of scaly graphite by applying an impact force, a compressive force and a shear force to the obtained mixture. 6 . A nonaqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, and a nonaqueous electrolyte, wherein the negative electrode includes the graphite-based negative electrode active material according to claim 1 .
Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title
Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title
Physical characteristics, e.g. porosity, surface area · CPC title
as layered products · CPC title
involving compressing or compaction · CPC title
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