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Single component sulfur-based cathodes for lithium and lithium-ion batteries

a sulfur-based cathode and lithium-ion battery technology, applied in the direction of non-metal conductors, cell components, conductors, etc., can solve the problems of less desirable materials and poor battery performance, and achieve the effect of attractive cathode use, wide potential conductivity window, and attractive cathode us

Inactive Publication Date: 2006-04-06
POPE JOHN +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention relates to the selection and synthesis of cathode materials for batteries. The selection is based on the characteristics of the conducting polymer and sulfur or selenium species, including ease of fabrication, ionic conductivity, no labile protons, good overlap of thermodynamic potentials, and stability to repeated charge and discharge cycles. The resulting cathode materials exhibit a redox mediation window and are not mobile, which improves battery performance. The invention also provides a method for synthesizing the selected cathode material and batteries comprising the cathode materials."

Problems solved by technology

If the conducting polymer is inherently in a less-conductive state in the potential region where the sulfur or selenium species exhibits redox species behavior, mediation of electrons between the current collector and the sulfur or selenium species is poorly effected, the material is less desirable, and the battery performance is poorer.

Method used

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  • Single component sulfur-based cathodes for lithium and lithium-ion batteries
  • Single component sulfur-based cathodes for lithium and lithium-ion batteries
  • Single component sulfur-based cathodes for lithium and lithium-ion batteries

Examples

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Effect test

example 1

[0068] The first attempted, unsuccessful, synthesis involved Cu(l) assisted nucleophilic displacement of the bromine groups of 3,4-dibromothiophene with 1,2-dithiane-4,5-diol to form the desired cyclic ester (Scheme 1).

Experimental:

[0069] 3,4-(1,2-dithiane-4,5-diol) Thiophene. Pyridine (5 mL) was added to 1,2-dithiane-4,5-diol (0.27 g, 1.80 mmol). CuI (0.01 g, 0.07 mmol) and KOtBu (0.06 g, 0.54 mmol) to produce a yellow solution which turned green after stirring at ambient temperature over a period of 1 h, 3,4-dibromothiophene (0.09 g, 0.36 mmol) was then added to the reaction mixture which was heated at 100° C. for 24 h. A distillation was then done to remove pyridine. The remaining solution was dissolved in 0.05 M EDTA to remove complexed copper. An extraction was done with ethyl acetate. The organic, ethyl acetate, layer was concentrated under vacuum. This procedure did NOT result in the desired compound, the actual identity of the remaining solution was not confirmed.

[0070] ...

example 2

[0076] The use of 3,4-dihydroxythiophene is also necessary in the synthesis of the second desired monomeric component shown in FIG. 2 and will be synthsized as described above. Scheme 4 shows the mechanism of formation of the compound shown in FIG. 2. The reaction of 3,4-dihydroxythiophene with 2,2-dimehtyl-1,3-dioxolane-4-methanol in the presence of a base, followed by H3O+ addition, resulted in the formation of compound K. Alternatively, this is also formed by the addition of 2 equivalents of allyl bromide to 3,4-dihydroxythiophene in the presence of a base. The resulting product, J, was treated with catalytic amounts of OsO4 and sodium periodate to produce compound K. Once compound K was obtained it was treated with PBr3 or tosyl chloride to form L, where LG=Br or OTs. Compound L can also be produced by the addition of 1,2,3-tribromopropane to 3,4-dihydroxythiophene. Treatment of L with potassium thioacetate resulted in formation of M. Polymerization of this material was done in ...

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Abstract

The present invention pertains to the selection of cathode materials. The cathode materials of concern are the conducting polymer or backbone and the redox active species or sulfur species. The selection of the materials is based on the characteristics of the materials relating to the other components of the batteries and to each other. The present invention also pertains to the resultant cathode materials, particularly a selected cathode material of a single component sulfur-based conducting polymer with the sulfur species covalently linked to the conducting polymer, and most particularly a thiophene based polymer with covalently linked sulfur species. The conducting polymers have been covalently-derivatized with sulfides and / or sulfide-containing groups as battery cathode materials. The present invention also pertains to a battery employing the selection method and resultant cathode materials.

Description

RELATED APPLICATIONS [0001] This application claims priority to U.S. Provisional patent application 60 / 118,068, the contents of which are incorporated herein by reference in their entirety.TECHNICAL FIELD [0002] The present invention relates generally to cathodes for rechargeable batteries. More particularly, the present invention relates to cathode materials based on conducting polymers and sulfur or selenide species and the method of selecting conducting polymers and sulfur or selenide species. The selection method accounts for characteristics of the conducting polymer and the sulfur or selenide species and the specific capacity, capacity fade, charge and discharge rate, physical and chemical stability, safety and other characteristics associated with battery cycles. More particularly, the present invention relates to a single component sulfur-based conducting polymer for use in lithium batteries and the synthesis of such material. BACKGROUND [0003] Increasing reliance on sophisti...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M4/60H01M4/58C08G61/12H01B1/12H01M4/02H01M4/136H01M4/137H01M4/36H01M10/0525H01M10/36
CPCC08G61/12C08G61/126H01B1/127H01M4/136H01M4/137H01M4/364H01M4/60H01M4/608H01M10/0525H01M2004/021Y02E60/122Y02E60/10H01M4/38H01M4/602H01M2004/028
Inventor POPE, JOHNBUTTRY, DANWHITE, SHANNONCORCORAN, ROBERT
Owner POPE JOHN
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