CARBON MATERIAL FOR NEGATIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERY, MANUFACTURING PROCESS THEREFOR AND USE THEREOF
First Claim
1. A method for manufacturing a carbon material for use in negative electrode of lithium ion secondary battery, comprisingapplying impact compression force to a granular artificial graphite made from needle coke using a mechanical rotary machine under conditions of a peripheral velocity of not less than 20 m/s and not more than 200 m/s and a processing duration of not less than 10 seconds and not more than 5 minutes to perform surface modification.
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Abstract
A carbon material for negative electrodes in lithium ion secondary battery, wherein a specific surface area is not less than 1.5 m2/g and not more than 6.5 m2/g, a tap density is not less than 0.5 g/cm3 and not more than 1.3 g/cm3, a Raman R value is not less than 0.1 and not more than 0.4, no diffraction peak is present in a range of diffraction angle of 42.7° to 43.7° in X-ray diffraction analysis, d002 is not more than 0.337 nm, and at most one peak is present in a range of not less than 500° C. and less than 1000° C. in thermogravimetric-differential thermal analysis.
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Citations
16 Claims
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1. A method for manufacturing a carbon material for use in negative electrode of lithium ion secondary battery, comprising
applying impact compression force to a granular artificial graphite made from needle coke using a mechanical rotary machine under conditions of a peripheral velocity of not less than 20 m/s and not more than 200 m/s and a processing duration of not less than 10 seconds and not more than 5 minutes to perform surface modification.
Specification