US 11,939,703 B2
Method for producing graphene fibres
Martin Koehne, Asperg (DE)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Appl. No. 17/625,721
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed May 29, 2020, PCT No. PCT/EP2020/064995
§ 371(c)(1), (2) Date Jan. 7, 2022,
PCT Pub. No. WO2021/004692, PCT Pub. Date Jan. 14, 2021.
Claims priority of application No. 10 2019 210 211.5 (DE), filed on Jul. 10, 2019.
Prior Publication US 2022/0290336 A1, Sep. 15, 2022
Int. Cl. D01F 9/12 (2006.01); D01D 5/04 (2006.01); D01D 5/06 (2006.01); D01F 1/09 (2006.01); D01F 11/10 (2006.01)
CPC D01F 9/12 (2013.01) [D01D 5/04 (2013.01); D01D 5/06 (2013.01); D01F 1/09 (2013.01); D01F 11/10 (2013.01)] 23 Claims
 
1. A process for producing graphene fibers, the process comprising the steps:
a. providing single-layer or multilayer graphene flakes or graphene oxide flakes based on graphene or on graphene oxide,
b. applying a transition metal or a transition metal oxide to the graphene flakes or graphene oxide flakes by a deposition process,
c. spinning a graphene fiber or graphene oxide fiber by injection of a spinning solution comprising in dispersed form the graphene flakes or graphene oxide flakes obtained from step b),
d. treating the graphene fiber or the graphene oxide fiber in a process atmosphere containing a reducing agent at a defined treatment temperature, wherein a graphene oxide fiber, if present, is reduced to a graphene fiber, wherein the graphene fiber or graphene oxide fiber is treated such that the transition metal oxide in step d) is only partially reduced or such that the transition metal in a step following step d) is partially oxidized.