US 12,255,017 B2
Self-supporting carbon electrode
Marappa Gounder Rajendran, Harwell (GB); Myrsini Kyriaki Antoniou, Harwell (GB); Stephen David Voller, Harwell (GB); and Hugh Liam Sutherland, Harwell (GB)
Assigned to ZapGo Ltd, Oxford (GB)
Appl. No. 16/603,396
Filed by ZapGo Ltd, Harwell (GB)
PCT Filed Apr. 6, 2018, PCT No. PCT/GB2018/050931
§ 371(c)(1), (2) Date Oct. 7, 2019,
PCT Pub. No. WO2018/185497, PCT Pub. Date Oct. 11, 2018.
Claims priority of application No. 17386014 (EP), filed on Apr. 7, 2017; and application No. 1707364 (GB), filed on May 8, 2017.
Prior Publication US 2021/0090820 A1, Mar. 25, 2021
Int. Cl. H01G 11/38 (2013.01); H01G 11/24 (2013.01); H01G 11/48 (2013.01); H01G 11/52 (2013.01); H01G 11/58 (2013.01); H01G 11/86 (2013.01)
CPC H01G 11/38 (2013.01) [H01G 11/24 (2013.01); H01G 11/48 (2013.01); H01G 11/52 (2013.01); H01G 11/58 (2013.01); H01G 11/86 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A supercapacitor comprising one or more units comprising an ionic liquid electrolyte, a membrane separator, and a self-supporting, free-standing supercapacitor electrode adapted for attachment to an electrical circuit characterised by comprising a free-standing rigid or mechanically resilient, electrically-conductive sheet consisting essentially of a matrix of from 70-90% by weight of activated carbon and 5 to 25% by weight conductive carbon; wherein the activated carbon and conductive carbon are uniformly dispersed in from 5 to 20% by weight of a polymer binder; wherein the electrodes are free-standing in that they are not supported by a metal current collector or a metal supporting substrate within the unit; and
wherein the electrodes comprise a main body and a metallised or metallic tab for providing electrical connection to an external circuit; wherein the electrode sheet has a density of greater than 0.4 grams per cm3; the electrode has a specific capacitance of greater than 100 Farads per gram; and the binder comprises a mixture of (i) a conducting polymer; and (ii) a fluorinated polymer, cellulosic material and/or an elastomer.