ARTIFICIAL GRAPHITE PARTICLE AND METHOD FOR PRODUCING THE SAME, NONAQUEOUS ELECTROLYTE SECONDARY BATTERY NEGATIVE ELECTRODE AND METHOD FOR PRODUCING THE SAME, AND LITHIUM SECONDARY BATTERY

摘要

An artificial graphite particle having a secondary particle structure where a plurality of primary particles of graphite are collected or bonded, characterized in that the edge part of the primary particle has a layer structure bent into a polygonal shape. The graphite particles are located through a gap and can be produced easily by a method for passing a material graphite particle through the gap between two members one or both of which rotates. A lithium secondary battery employing the graphite particles as a negative electrode material has a high capacity and excellent quick charge/discharge characteristics and in which cycle deterioration is suppressed.