Effects of adding copper(II) salt to organosulfur cathodes for rechargeable lithium batteries

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1837549· OSTI ID:509366

Oyama, Noboru; Pope, J M ^[1]; Sotomura, Tadashi ^[2]

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1. Tokyo Univ. of Agriculture and Technology, Koganei, Tokyo (Japan)
2. Matsushita Electric Industrial Co. Ltd., Moriguchi, Osaka (Japan). Central Research Labs.

The authors report the preliminary analysis of a new cathode material and the performance of secondary lithium cells which contain it. The material is comprised of an organosulfur compound, 2,5-dimercapto-1,3,4-thiadiazole (DMcT), doped with a copper(II) salt in a poly(aniline) matrix. Secondary lithium cells which use this material as cathodes can be discharged at 300 Ah per kg-cathode for ca. 10 cycles 260 Ah per kg-cathode for at least 80 cycles, or 170 Ah per kg-cathode for ca. 130 cycles. Further, after failure of these cells, replacement of the lithium anode restores the original capacity. Vibrational and electronic spectroscopy of the copper(II)/DMcT system agree with previous reports on the redox chemistry which occurs between Cu(II) and thioamide groups. A preliminary cyclic voltammetric study of this system indicates that the electroactive compound is probably a Cu(I)DMcT complex which does not exhibit traditional electrocatalytic behavior, most likely due to the effects of proton-coupling in the redox processes of DMcT.

• Sponsoring Organization: USDOE
• OSTI ID: 509366
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 4 Vol. 144; ISSN 0013-4651; ISSN JESOAN
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
36 MATERIALS SCIENCE
CATHODES
COPPER
DOPED MATERIALS
ELECTRICAL PROPERTIES
LITHIUM
METAL-NONMETAL BATTERIES
ORGANIC SULFUR COMPOUNDS
PERFORMANCE
SERVICE LIFE
THIADIAZOLES