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US 2011/0256449 A1Published application
Organic coated fine particle powders
AssigneeConocoPhillips Company
InventorZhenhua MAO
Life of this patent
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Abstract
Solid organic matter coated fine solid particles and the applications of such coated particles are described. These uniformly coated carbonaceous particles provide an improved material for use as an electrochemical material. In one example, methods of manufacturing uniformly coated particles from lignin and graphite are described. In another embodiment, petroleum pitch coated calcined coke powder is demonstrated.
Claims31
A method for preparing solid heavy hydrocarbon-coated particles, comprising:
- a) dissolving a large hydrocarbon compound or large hydrocarbon compound mixture in two organic solvents to form solution B and heating solution B;
- b) dispersing solid particles in the second solvent to form mixture C and heating the mixture C,
- c) mixing solution B and mixture C together and cooling the mixture to cause all or a certain portion of the large hydrocarbon compound mixture to precipitate out as coating on the solid particles,
- d) separating the coated solid particles from the solution;
- and
- e) carbonizing the coated solid particles to provide carbonaceous material coated particles.
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An electrochemical material for an electrode comprising:
- a) a graphite particle;
- and
- b) a large hydrocarbon compound coating;
- wherein said graphite particles are dispersed in xylene, said lignin is dissolved in pitch and xylene, wherein said graphite-xylene solution and said lignin-pitch-xylene solution are mixed, and wherein said graphite is uniformly coated with lignin while boiling the mixed solution.
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The method of producing an electrochemical material for an electrode comprising:
- a) mixing lignin with pitch to form solution A,
- b) mixing solution A with xylene to form solution B,
- c) dissolving graphite particles in xylene to form solution C,
- d) heating solution B and solution C to boiling point,
- e) mixing the solution B and solution C at boiling point, and
- f) isolating graphite particles uniformly coated with lignin.
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Dependencies are inferred from the claim text.