Secondary battery and anode
AssigneeSony Corporation
InventorsTakakazu Hirose, Kenichi Kawase, Kazunori Noguchi, Takayuki Fujii
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Abstract
A secondary battery capable of obtaining superior cycle characteristics and superior swollenness characteristics is provided. The secondary battery includes a cathode and an anode capable of inserting and extracting an electrode reactant; and an electrolyte containing a solvent and an electrolyte salt. The anode has an anode active material layer on an anode current collector. The anode active material layer contains a plurality of crystalline anode active material particles having silicon (Si) as an element. The plurality of anode active material particles contain a spherical particle and a nonspherical particle.
Claims19
A secondary battery comprising:
- a cathode and an anode capable of inserting and extracting an electrode reactant;
- and
- an electrolyte containing a solvent and an electrolyte salt,
- wherein,
- the anode has an anode active material layer on an anode current collector,
- the anode active material layer comprises at least one layer which includes anode active material particles including a plurality of spherical crystalline particles each having silicon (Si) and iron (Fe) and a plurality of non-spherical particles each having a plate-like outline when viewed in cross-section, and
- a number of spherical crystalline particles having a diameter of 0.1 μm to 40 μm, both inclusive, is 10 to 200, both inclusive, as obtained as an average count per image for thirty 10.75 μm×16.00 μm SEM images at 8000 times magnification, the images being of a surface of the anode active material layer, and
- at least part of each of the non-spherical particles has a planular shape.
An electronic apparatus comprising a secondary battery as a power supply source, the secondary battery including:
- a cathode and an anode capable of inserting and extracting an electrode reactant;
- and
- an electrolyte containing a solvent and an electrolyte salt,
- wherein,
- the anode has an anode active material layer on an anode current collector,
- the anode active material layer comprises at least one layer which includes anode active material particles including a plurality of spherical crystalline particles each having silicon (Si) and iron (Fe) and a plurality of non-spherical particles each having a plate-like outline when viewed in cross-section, and
- a number of spherical crystalline particles having a diameter of 0.1 μm to 40 μm, both inclusive, is 10 to 200, both inclusive, as obtained as an average count per image for thirty 10.75 μm×16.00 μm SEM images at 8000 times magnification, the images being of a surface of the anode active material layer, and
- at least part of each of the non-spherical particles has a planular shape.
Dependencies are inferred from the claim text.