(EP3406328) 1. Carbon nanotube pellets having an apparent density of 90 kg/m3 or more, which are obtained by mixing carbon nanotubes (CNTs) and a solvent at a weight ratio of 5:1 to 1:2 and extruding the mixture. 2. The carbon nanotube pellets according to claim 1, wherein the pellets has a diameter of 3 mm to 20 mm and a length of 10 mm to 200 mm. 3. The carbon nanotube pellets according to claim 1, wherein a compression ratio of the carbon nanotubes (CNTs) satisfies by the following Expression 1. CNT compression ratio %=apparent density of CNT pellet/apparent density of CNT before compression 4. The carbon nanotube pellets according to claim 1, wherein a particle size (D50) of the carbon nanotubes contained in the pellets is 200 µm or less. 5. The carbon nanotube pellets according to claim 1, wherein a particle size (D50) of the carbon nanotubes contained in the pellets is 20 µm or less. 6. The carbon nanotube pellets according to claim 1, wherein a particle size (D50) of the carbon nanotubes contained in the pellets is 60% or less of an average particle size (D50) of the carbon nanotubes before compression. 7. The carbon nanotube pellets according to claim 1, wherein a particle size of the carbon nanotubes contained in the pellets is D50 of 20 µm or less and D90 of 50 µm or less. 8. The carbon nanotube pellets according to claim 1, wherein the solvent is at least one selected from the group consisting of water, alcohols, Cellosolve, ketones, amides, esters, ethers, aromatic hydrocarbons, and aliphatic hydrocarbons. 9. A method for producing carbon nanotube pellets, comprising the steps of: mixing and stirring carbon nanotubes and a solvent at a weight ratio of 5: 1 to 1: 2 to prepare a carbon nanotube paste; extruding the carbon nanotube paste with an extruder to mold into pellets; and drying the pellets. 10. The method for producing carbon nanotube pellets, comprising the steps of: premixing carbon nanotubes and a solvent; mixing the premixed solution of carbon nanotubes to prepare a carbon nanotube paste having the carbon nanotubes and the solvent at a weight ratio of 5: 1 to 1: 2; transferring the carbon nanotube paste into an extruder and extruding it into pellets; and drying the pellets. 11. The method for producing carbon nanotube pellets according to claim 10, wherein the premixed solution of carbon nanotubes is mixed to be the carbon nanotube paste by using a screw mixer apparatus. 12. The method for producing carbon nanotube pellets according to claim 9 or 10, wherein the method further comprises the step of drying the pellets at 100 °C or higher for a predetermined time. 13. The method for producing carbon nanotube pellets according to claim 9 or 10, wherein a particle size (D50) of the carbon nanotubes contained in the pellets is 60% or less of a particle size (D50) of the carbon nanotubes before compression. 14. The method for producing carbon nanotube pellets according to claim 9 or 10, wherein the method further comprises the steps of: dispersing the carbon nanotube pellets in the solvent to prepare a mixed solution of carbon nanotubes; and extruding the mixed solution of carbon nanotubes with the extruder again to mold it into pellets. 15. The method for producing carbon nanotube pellets according to claim 14, wherein the mixed solution in which the carbon nanotube pellets are dispersed has a viscosity of 4000 cps or less. 16. A CNT composite material produced by using the carbon nanotube pellets of any one of claims 1 to 8.
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