The invention relates to the technical field of a
lithium ion secondary battery, in particular to a preparation method of high-rate fast-rapid
graphite. The preparation method is characterized by comprising the following steps of (1) smashing and shaping a
raw material; (2) mixing; (3) performing graphitization high-temperature
processing, in which graphitization high-temperature
processing is performed on the mixed material for 24-48 hours at 2,800-3,200 DEG C under protection of
inert gas; (4) mixing the materials; (5) performing low-temperature
thermal treatment; (6) performing
carbonization thermal treatment; and (7) screening the mixed material. compared with the prior art, the preparation method has the advantages that the
graphite is high in charge-
discharge rate, large in
discharge capacity and good in cycle performance, a button
cell prepared from the
graphite has excellent comprehensive performance and has main following advantages of relatively good large-current charge-
discharge performance, good electrochemical performance, good cycle property, relatively high safety, relatively good adaptability to an
electrolyte and other additives and stable product characteristic, the charge-
discharge rate can reach over 10C, and the preparation method is suitable for industrial production.