Sulfur-carbon composite, nonaqueous electrolyte battery including electrode containing sulfur-carbon composite, and method for producing sulfur-carbon composite
AssigneeGS Yuasa International Ltd.
InventorHeisuke NISHIKAWA
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Abstract
Provided are a sulfur-carbon composite having a high discharge capacity per mass and a high sulfur utilization rate, and a nonaqueous electrolyte battery including an electrode containing the sulfur-carbon composite. In the sulfur-carbon composite, a mass loss ratio X at 500° C. in thermal mass analysis and a mass ratio Y of sulfur/(sulfur+carbon) in an observation visual field at a magnification of 1000 in SEM-EDS quantitative analysis satisfy the relationship of |X/Y−1|≤0.12, and porous carbon has a mean pore diameter of 1 to 6 nm, and a specific surface area of 2000 m2g−1 or more and 3000 m2−1 or less.
Claims11
1-9. (canceled)
A sulfur-carbon composite in which sulfur is carried on porous carbon, wherein
- a mass loss ratio X of the sulfur-carbon composite, in thermal mass analysis of the sulfur-carbon composite, over a temperature range from room temperature 500° C. with respect to a mass of the sulfur-carbon composite at room temperature and a mass ratio Y of sulfur/(sulfur+carbon) in an observation visual field at a magnification of 1000 in SEM-EDS quantitative analysis of the sulfur-carbon composite satisfy the relationship of:
- |X/Y−1|≤0.12,
- the porous carbon has a mean pore diameter of 1 to 6 nm.
A method for producing a sulfur-carbon composite,
- the method comprising a step of heating, in a closed container, a mixture obtained by mixing sulfur with porous carbon to form a sulfur-carbon composite,
- the heating step including:
- a first step of heating the mixture for 5 hours or more at a temperature at which sulfur is melted;
- and
- a second step of heating the mixture at a temperature at which sulfur is vaporized, after the first step,
- wherein the porous carbon has a mean pore diameter of 1 to 6 nm.
A method for producing a sulfur-carbon composite,
- the method comprising a step of heating, in a closed container, a mixture obtained by mixing sulfur with porous carbon to form a sulfur-carbon composite,
- the heating step including heating the mixture at a temperature rise rate of 0.5° C./minute or less to a temperature at which sulfur is melted, and to a temperature at which sulfur is vaporized,
- wherein the porous carbon has a mean pore diameter of 1 to 6 nm.
Dependencies are inferred from the claim text.