US 12,406,992 B2
Dispersible edge functionalised graphene platelets
Gordon George Wallace, Wollongong (AU); David Leslie Officer, Figtree (AU); Rouhollah Jalili, Maroubra (AU); Ashley John Walker, Albion Park (AU); Gregory Michael Ryder, Unanderra (AU); and Shaikh Nayeem Faisal, West Wollongong (AU)
Assigned to SICONA BATTERY TECHNOLOGIES PTY LTD, South Perth (AU)
Appl. No. 17/283,705
Filed by SICONA BATTERY TECHNOLOGIES PTY LTD, South Perth (AU)
PCT Filed Oct. 4, 2019, PCT No. PCT/AU2019/051076
§ 371(c)(1), (2) Date Apr. 8, 2021,
PCT Pub. No. WO2020/073081, PCT Pub. Date Apr. 16, 2020.
Claims priority of application No. 2018903793 (AU), filed on Oct. 8, 2018.
Prior Publication US 2021/0328221 A1, Oct. 21, 2021
Int. Cl. H01M 4/587 (2010.01); C01B 32/194 (2017.01); C08K 3/04 (2006.01); H01M 4/04 (2006.01); H01M 4/62 (2006.01)
CPC H01M 4/587 (2013.01) [C01B 32/194 (2017.08); C08K 3/042 (2017.05); H01M 4/0404 (2013.01); H01M 4/623 (2013.01); C01B 2204/04 (2013.01); C01B 2204/22 (2013.01); C01B 2204/28 (2013.01); C01B 2204/30 (2013.01); C01B 2204/32 (2013.01); C01P 2002/72 (2013.01); C01P 2002/82 (2013.01); C01P 2004/03 (2013.01); C01P 2004/04 (2013.01); C08K 2201/001 (2013.01); C08K 2201/011 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A dispersible graphene platelet including:
a base layer of graphene;
at least one discontinuous graphene layer stacked on the base layer;
wherein each discontinuous layer has a smaller surface area than the layer it is stacked upon;
wherein each base layer and each discontinuous layer is defined by a central region and an edge region; and
wherein the edge regions of the base layer and the at least one discontinuous layer are at least partially functionalized by oxidation with ruthenium tetroxide and the central regions of the base layers and the discontinuous layers are unfunctionalized;
wherein the resulting platelet forms a stable dispersion in water at concentrations up to 10 mg/mL for at least 3 months, forms a stable suspension in water at concentrations over 100 mg/mL for at least 6 hours, or forms a stable suspension in organic solvents at concentrations of 50 mg/mL for at least 6 hours.