Hexasubstituted guanidinium salts and ultracapacitors employing

Details Hexasubstituted guanidinium salts and ultracapacitors employing Hexasubstituted guanidinium salts and ultracapacitors employing

1996-02-28

1998-03-10

Picard, Leo P.

Electricity: electrical systems and devices

Electrolytic systems or devices

Liquid electrolytic capacitor

361502, 361527, 564230, H01G 902

Patent

active

057268568

ABSTRACT:
Ultracapacitors including at least one cell with two solid, non-porous current collectors, two porous electrodes, preferably of carbon, and a porous separator between the electrodes, employ as electrolytes materials comprising at least one hexasubstituted guanidinium salt. Such salts may be employed in solution in a stable organic liquid such as propylene carbonate, or neat in liquid form. They may be prepared by first preparing a hexasubstituted guanidinium halide and then performing an anion exchange reaction, either with a salt which forms an insoluble halide such as a silver salt or by a liquid--liquid extraction method.

REFERENCES:
patent: 5132423 (1992-07-01), Brunelle et al.
patent: 5383089 (1995-01-01), Williams et al.
patent: 5426561 (1995-06-01), Yen et al.

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