Sulfur-based active material, electrode, lithium-ion secondary battery, and producing methods thereof
AssigneeSumitomo Rubber Industries, Ltd.
InventorsFumiya CHUJO, Tatsuya KUBO
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Abstract
It is an object of the present invention to improve a volumetric energy density while maintaining a capacity retention rate of an active material that constitutes an electrode of a lithium-ion secondary battery. Provided is a method of producing a sulfur-based active material, the method comprising the steps of: (1) mixing an acrylic resin, sulfur, and an iron compound comprising a divalent or trivalent iron ion to obtain a raw material; and (2) baking the raw material; wherein the iron compound has a median diameter of 12.00 μm or less.
Claims20
A method of producing a sulfur-based active material, the method comprising the steps of:
- (1) mixing an acrylic resin, sulfur, and an iron compound comprising a divalent or trivalent iron ion to obtain a raw material;
- and
- (2) baking the raw material,
- wherein the iron compound has a median diameter of 12.00 μm or less.
A sulfur-based active material,
- the sulfur-based active material being obtained by baking a raw material comprising an acrylic resin, sulfur, and an iron compound comprising a divalent or trivalent iron ion, the sulfur-based active material at least comprising carbon, sulfur, and iron as constituent elements,
- wherein a median diameter of the iron compound is 12.00 μm or less,
- wherein the sulfur-based active material comprises iron disulfide, and
- wherein a content of sulfur as a constituent element is 40.0% by mass or more.
Dependencies are inferred from the claim text.