Patent ID: 7986510
Filing Date: 2011-07-26
Classification: H01G,Y02E

Abstract:
1. An electrochemical device which comprises the combination of at least one carbon electrode comprising; a) a metal collector on the top and bottom surfaces; b) optionally, a first conductive carbon layer on each of the top and bottom interior surfaces of the collectors; c) a porous second conductive carbon layer on each of said first conductive carbon layers, said second conductive carbon layers being substantially free of oxygen and heteroatoms containing functional groups; d) a porous inert separator between said second conductive carbon layers; and e) an electrolyte which comprises at least one conductive salt selected from the group consisting of a compound of the general formula: wherein R 1 , R 2 , R 3 and R 4 are the same or different and consisting of an alkyl group having 1 to 4 carbon atoms, R 5 and R 6 are hydrogen or methyl and a solvent free of a nitrile solvent comprising ethylene carbonate and a member of the group consisting of propylene carbonate, dimethyl carbonate, gamma butyrolactone, 1,2-dimethoxy ethane, and triethylene glycol dimethyl ether, said salt being in a concentration of 1.5 to 4.5 M and said solvent comprising about 10 to 70% by weight of ethylene carbonate whereby there is a eutectic mixture of the solvents and/or the solvents and the salt.