Apparatus for manufacturing negative-electrode carbon material, and method for manufacturing negative-electrode carbon material using same

Abstract

The present invention provides an apparatus for manufacturing a lithium-ion secondary cell negative-electrode carbon material by heat-treating carbon particles while causing the carbon particles to flow within a heat-treatment furnace, the apparatus for manufacturing a lithium-ion secondary battery negative-electrode carbon material having: a heat-treatment furnace provided with a carbon-particle supply opening for supplying the carbon particles into the interior, and a negative-electrode carbon material recovery opening for taking out the negative-electrode carbon material from the interior; and a cooling tank connected in an airtight manner to the negative-electrode carbon material recovery opening of the heat-treatment furnace, and provided with a cooling means. Also provided is a method for manufacturing a lithium-ion secondary battery negative-electrode carbon material by using the apparatus.

1 - 8 . (canceled) 
     
     
         9 . A batchwise apparatus for manufacturing a negative-electrode carbon material for a lithium-ion secondary battery by heat-treating carbon particles while causing the carbon particles to flow within a heat-treatment furnace, the apparatus for manufacturing a negative-electrode carbon material for a lithium-ion secondary battery comprising:
 a heat-treatment furnace provided with a carbon-particle supply opening for supplying the carbon particles to an interior, and a negative-electrode carbon material recovery opening for taking out the negative-electrode carbon material from the interior; and   a cooling tank connected in an airtight manner via an on-off valve to the negative-electrode carbon material recovery opening of the heat-treatment furnace, and provided with a cooling means.   
     
     
         10 . The apparatus for manufacturing a negative-electrode carbon material according to  claim 9 , wherein the heat-treatment furnace is a carbonizing furnace or a chemical vapor deposition furnace. 
     
     
         11 . The apparatus for manufacturing a negative-electrode carbon material for a lithium-ion secondary battery according to  claim 9 , wherein, to the carbon-particle supply opening, a preheating tank provided with a means that preliminarily heats the carbon particles is connected via an on-off valve. 
     
     
         12 . A batchwise method for manufacturing a negative-electrode carbon material for a lithium-ion secondary battery, comprising:
 a carbon-particle supplying step of supplying carbon particles to an interior of a heat-treatment furnace;   a heat-treating step of heat-treating the carbon particles to 650° C. or higher while causing the particles to flow within the heat-treatment furnace to produce the negative-electrode carbon material; and   a negative-electrode carbon material transporting step of transporting the negative-electrode carbon material produced in the heat-treating step from the interior of the heat-treatment furnace to a cooling tank via an on-off valve,   the method repeating the steps sequentially, wherein   the carbon-particle supplying step carried out after the negative-electrode carbon material transporting step supplies carbon particles to the interior of the heat-treatment furnace having a temperature of 650° C. or higher.   
     
     
         13 . The method for manufacturing a negative-electrode carbon material for a lithium-ion secondary battery according to  claim 12 , wherein the heat-treating step is a carbonizing step of carbonizing the carbon particles at 800 to 1200° C. while causing the carbon particles to flow within the heat-treatment furnace. 
     
     
         14 . The method for manufacturing a negative-electrode carbon material for a lithium-ion secondary battery according to  claim 12 , wherein the heat-treating step is a chemical vapor deposition treating step of bringing a source for carbon vapor deposition into contact with a surface of the carbon particles while causing the carbon particles to flow within the heat-treatment furnace, along with pyrolyzing the source for carbon vapor deposition at 650 to 1200° C. to vapor-deposit a pyrolyzed carbon onto the surface of the carbon particles. 
     
     
         15 . The method for manufacturing a negative-electrode carbon material for a lithium-ion secondary battery according to  claim 12 , wherein the carbon particles supplied to the interior of the heat-treatment furnace in the carbon-particle supplying step are carbon particles preliminarily heated to 100 to 1200° C. 
     
     
         16 . The method for manufacturing a negative-electrode carbon material for a lithium-ion secondary battery according to  claim 12 , wherein the carbon particles are any of:
 a phenolic resin, a naphthalene sulfonic acid resin, polyvinylidene chloride, carboxymethylcellulose, a polyacrylonitrile resin, polyvinyl chloride, and a gilsonite coke;   a petroleum mesophase pitch or a coal mesophase pitch, and a petroleum coke or a coal pitch coke obtained by carbonizing the mesophase pitch at 300 to 500□C; and   a natural graphite and an artificial graphite.