Nonaqueous electrolyte energy storage device
AssigneeGS Yuasa International Ltd.
InventorSuguru CHIZAWA
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Abstract
The nonaqueous electrolyte energy storage device according to an aspect of the present invention includes a negative electrode including graphite and graphitizable carbon, in which a ratio of a mass of the graphitizable carbon to a total mass of the graphite and the graphitizable carbon is less than 26% by mass, and a median diameter of the graphitizable carbon is smaller than a median diameter of the graphite.
Claims11
A nonaqueous electrolyte energy storage device comprising a negative electrode including graphite and graphitizable carbon,
- wherein a ratio of a mass of the graphitizable carbon to a total mass of the graphite and the graphitizable carbon is less than 26% by mass, and
- wherein a median diameter of the graphitizable carbon is smaller than a median diameter of the graphite.
A nonaqueous electrolyte energy storage device comprising a negative electrode including graphite and graphitizable carbon,
- wherein a ratio of a mass of the graphitizable carbon to a total mass of the graphite and the graphitizable carbon is less than 26% by mass,
- wherein a median diameter of the graphitizable carbon is smaller than a median diameter of the graphite, and
- wherein the ratio (graphitizable carbon/graphite) of the median diameter of the graphitizable carbon to the median diameter of the graphite is 0.30 or less.
A nonaqueous electrolyte energy storage device comprising a negative electrode including graphite and graphitizable carbon,
- wherein a ratio of a mass of the graphitizable carbon to a total mass of the graphite and the graphitizable carbon is less than 26% by mass,
- wherein a median diameter of the graphitizable carbon is smaller than a median diameter of the graphite, and
- wherein a mass ratio (natural graphite/artificial graphite) of the natural graphite to the artificial graphite is 37.5/62.5 or more and 75/25 or less.
Dependencies are inferred from the claim text.