Mixed solvent electrolytes for ambient temperature secondary lit

Details Mixed solvent electrolytes for ambient temperature secondary lit Mixed solvent electrolytes for ambient temperature secondary lit

1990-05-07

1991-07-09

Skapars, Anthony

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Include electrolyte chemically specified and method

429218, H01M 616

Patent

active

050305280

ABSTRACT:
The present invention comprises an improved electrolyte for secondary lithium-based cells as well as batteries fabricated using this electrolyte. The electrolyte is a lithium containing salt dissolved in a non-aqueous solvent, which is made from a mixture of ethylene carbonate, ethylene propylene diene terpolymer, 2-methylfuran, and 2-methyltetrahydrofuran. This improved, mixed solvent electrolyte is more conductive than prior electrolytes and much less corrosive to lithium anodes. Batteries constructed with this improved electrolyte utilize lithium or lithium alloy anodes and cathodes made of metal chalcogenides or oxides, such as TiS.sub.2, NbSe.sub.3, V.sub.6 O.sub.13, V.sub.2 O.sub.5, MoS.sub.2, MoS.sub.3, CoO.sub.2, or CrO.sub.2, dissolved in a supporting polymer matrix, like EPDM. The preferred non-aqueous solvent mixture comprises approximately 5 to 30 volume percent ethylene carbonate, approximately 0.01 to 0.1 weight percent ethylene propylene diene terpolymer, and approximately 0.2 to 2 percent 2-methylfuran, with the balance being 2-methyltetrahydrofuran. The most preferred solvent comprises approximately 10 to 20 volume percent ethylene carbonate, about 0.05 weight percent ethylene propylene diene terpolymer, and about 1.0 percent 2-methylfuran, with the balance being 2-methyltetrahydrofuran. The concentration of lithium arsenic hexafluoride can range from about 1.0 to 1.8 M; a concentration 1.5 M is most preferred. Secondary batteries made with the improved electrolyte of this invention have lower internal impedance, longer cycle life, higher energy density, low self-discharge, and longer shelf life.

REFERENCES:
patent: 4489145 (1984-12-01), Abraham et al.
patent: 4668596 (1987-05-01), Shacklette et al.
patent: 4770960 (1988-09-01), Nagaura et al.
patent: 4780381 (1988-10-01), Shacklette et al.
patent: 4803137 (1989-02-01), Miyazaki et al.
patent: 4814242 (1989-03-01), Maxfield et al.
patent: 4851309 (1989-07-01), Toyoguchi et al.
Shen et al., Evaluation of Mixed Solvent Electrolytes for Ambient Temperature Secondary Lithium Cells, Proceedings of the Power Source Symposium, May 1988, Cherry Hill, N.J.

Affiliated with

Also associated with

Rating

Mixed solvent electrolytes for ambient temperature secondary lit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Mixed solvent electrolytes for ambient temperature secondary lit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mixed solvent electrolytes for ambient temperature secondary lit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-617610