Patent ID: 9630852
Date: 2017-04-25
CPC Classifications: C01B

Claim:
1. A method of preparing a graphene material, comprising: (1) preparing a liquid polyacrylonitrile (LPAN) solution, stiffing the LPAN solution at between 80 and 300° C. for between 8 and 72 hrs to yield a cyclized polyacrylonitrile solution; (2) stirring the cyclized LPAN solution at between 200 and 300° C. for between 1 and 10 hrs to yield a thermally-oxidized polyacrylonitrile comprising a ladder structure; (3) grinding and sieving the thermally-oxidized polyacrylonitrile, and drying a resulting product at room temperature, to yield a thermally-oxidized precursor; (4) calcining the thermally-oxidized precursor in the presence of an inert gas flow of between 10 and 500 mL/min for between 1 and 24 hrs at a temperature of between 400 and 1000° C., to yield a carbonized precursor; and (5) calcining the carbonized precursor in the presence of an inert gas flow of between 10 and 500 mL/min for between 1 and 10 hrs at a temperature of between 1000 and 3000° C., to yield a graphene material.