A PROCESS OF PRODUCTION OF CARBON NEGATIVE ELECTRODE MATERIAL FOR LITHIUM ION BATTERY

摘要

The present invention provides a carbon negative electrode material for lithium ion battery by using natural graphite, especially spherical natural graphite as raw material A, tar coal/coal pitch/petroleum pitch or mixture thereof as raw material B, mixing the raw materials in a ratio of 1/0.5-10 of A to B, the resultant mixture subjecting to polymerization reaction at a temperature of 350-500°C under the pressure of 0.01 to 10 MPa for 5 to 420 minutes, drying the resultant product after extraction and separation, the dried product having the weight gain of 2-100% compared with raw material of graphite, finally, carbonizing or graphitizing the product to obtain carbon negative electrode material having a coated layer of artificial carbon or artificial graphite. The carbon negative electrode material for lithium ion battery has advantages of high specific capacity, long cycle lifetime and the like, is a desirable carbon negative electrode material.