Method for producing thin graphite flakes with large aspect ratios

Patent · 01 January 1993

OSTI ID:868662

Bunnell, L Roy ^[1]

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1. Kennewick, WA

A method for making graphite flakes of high aspect ratio by the steps of providing a strong concentrated acid and heating the graphite in the presence of the acid for a time and at a temperature effective to intercalate the acid in the graphite; heating the intercalated graphite at a rate and to a temperature effective to exfoliate the graphite in discrete layers; subjecting the graphite layers to ultrasonic energy, mechanical shear forces, or freezing in an amount effective to separate the layes into discrete flakes.

• Research Organization: BATTELLE MEMORIAL INSTITUTE
• DOE Contract Number: AC06-76RL01830
• Assignee: Battelle Memorial Institute (Richland, WA)
• Patent Number(s): US 5186919
• OSTI ID: 868662
• Country of Publication: United States
• Language: English

Related Subjects

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acid
amount
amount effective
aspect
aspect ratio
aspect ratios
concentrated
concentrated acid
discrete
discrete layer
discrete layers
effective
energy
exfoliate
flakes
forces
freezing
graphite
graphite flakes
heating
intercalate
intercalated
layers
layes
mechanical
method
presence
producing
providing
rate
ratio
ratios
separate
shear
shear force
shear forces
steps
strong
subjecting
temperature
temperature effective
time
ultrasonic
ultrasonic energy