| 摘要 |
PURPOSE: A negative electrode active material is provided to obtain a lithium secondary battery which has high capacity, excellent high voltage property, output property, and process efficiency. CONSTITUTION: A negative electrode active material(1) comprises porous composite particles. The porosity of the porous composite particle is 5-30 volume%. The porous composite particle comprises: a crystalline graphite(2) which is obtained by separating and pulverizing natural graphite or soil graphite and has an average particle diameter of 0.2-3 microns; and a carbon material(3) which is placed among the crystalline graphite, and includes another carbon material with amorphous hard carbon, low crystalline soft carbon, or a combinations thereof. The porous composite particle additionally comprises fibrous carbon among the crystalline graphite. |
