MESOPHASE SPHERULAR GRAPHITIZED SUBSTANCE, ANODE MATERIAL, ANODE, AND LITHIUM ION SECONDARY BATTERY USING SAME

摘要

A method for producing a methophase spherule graphatized substance such that the mean interplanar spacing d002 measured by X-ray diffraction is below 0.337 nm and the ratio ID/IG of the peak intensity ID in the region from 1350 to 1370 cm<-1> of the Raman spectrum using an argon laser beam of 514.5 nm wavelength to the peak intensity IG in the region from 1570 to 1630 cm<-1> ranges from 0.4 to 2, by simultaneously applying a compressive force and a shearing force to a methophase spherule graphatized substance. Such a methophase spherule graphatized substance satisfying the requirements of X-ray diffraction and Raman spectrum is also disclosed. The thus produced methophase spherule graphatized substance is preferably applied to the negative and the negative plate material of a lithium secondary cell. Therefore, a lithium ion secondary cell retaining a large discharge capacity and a high initial charging/discharging efficiency even if a water-based negative plate mix paste is used and having a high rapid charging efficiency that has not been conventionally achieved can be provided.