Negative electrode for lithium ion secondary battery, and lithium ion secondary battery
AssigneeNEC Energy Devices, Ltd.
InventorKouzou TAKEDA
Life of this patent
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Abstract
A negative electrode for a lithium ion secondary battery, the negative electrode including a negative electrode active material, a fine graphite material, a conductive aid, and a binder, wherein the mass ratio of the fine graphite material to the conductive aid is in the range from 1 to 10, and the average particle diameter (median diameter D50) of the fine graphite material is smaller than the average particle diameter of the negative electrode active material, and in the range of 1 to 15 μm.
Claims20
A negative electrode for a lithium ion secondary battery, the negative electrode comprising a negative electrode active material, a fine graphite material, a conductive aid, and a binder,
- wherein a mass ratio of the fine graphite material to the conductive aid is in a range from 1 to 10, and
- an average particle diameter (median diameter D50) of the fine graphite material is smaller than an average particle diameter (median diameter D50) of the negative electrode active material, and in a range of 1 to 15 μm.
A negative electrode for a lithium ion secondary battery, the negative electrode comprising a negative electrode active material, a fine graphite material, a conductive aid, and a binder,
- wherein the fine graphite material includes a particle contacting with a particle of the negative electrode active material, or a particle contacting with a particle of the conductive aid contacting with a particle of the negative electrode active material, with an electroconductive path formed between particles of the negative electrode active material via the particle of the fine graphite material,
- a mass ratio of the fine graphite material to the conductive aid is in a range from 1 to 10, and
- an average particle diameter (median diameter D50) of the fine graphite material is smaller than an average particle diameter (median diameter D50) of the negative electrode active material, and in a range of 1 to 15 μm.
Dependencies are inferred from the claim text.