Loading patent…
AssigneeHitachi Maxell, Ltd.
InventorsJinbao Zhao, Shoko Ibuki, Hideki Nishihama, Ryo Nagai
Estimating the term…
By eliminating a part of sulfur atoms of the polysulfide segment of the formula: —Sm— (m≧3) of an organic sulfur compound, a carbon polysulfide is synthesized, which comprises carbon and sulfur as constitutive elements and contains at least 67 wt. % of sulfur and at least 95 wt. % of carbon and sulfur in total, and which has a disulfide linkage formed by most of the sulfur atoms in the molecule and also has a highly uniform structure. A nonaqueous electrolytic battery which has a high capacity and shows a small decrease in capacity in association with cyclic charge and discharge is provided using this carbon polysulfide as an active material for the positive electrode.
A carbon polysulfide comprising carbon and sulfur as constitutive elements and containing at least 67 wt. % of sulfur and at least 95 wt. % of carbon and sulfur in total, wherein a main peak appears at or around 1444 cm−1 of a Raman shift and substantial only one peak appears at or around 490 cm−1 within a range of 400 cm−1 to 525 cm−1.
A carbon polysulfide comprising carbon and sulfur as constitutive elements and containing at least 67 wt. % of sulfur and at least 95 wt. % of carbon and sulfur in total, wherein the diffraction pattern within a range of diffraction angle (2 θ) of 20° to 30° is shown as substantially only one broad diffraction peak which has a peak at or around 25°, in the X-ray diffractometry with CuKα rays.
A carbon polysulfide comprising carbon and sulfur as constitutive elements and containing at least 67 wt. % of sulfur and at least 95 wt. % of carbon and sulfur in total, characterized in that a decrease in weight is not more than 5% in thermogravimetric analysis when the carbon polysulfide is heated from room temperature to 300° C. at a heating rate of 10° C./min.
Dependencies are inferred from the claim text.