Graphite powder for negative electrode of lithium ion secondary cell and method of production thereof

摘要

A method of producing graphite powder for a negative electrode of a lithium ion secondary cell excellent in discharge/charge efficiency (Coulomb efficiency) and having a high capacity retention rate, wherein 0.01 to 10 wt % (on the basis of the graphite material) of a starch derivative having C6H10O5 as a basic structure or other surface active materials are allowed to be adsorbed by or to coat the surface of a graphite material for a negative electrode capable of occluding and releasing lithium ions and furthermore at least one kind of metal elements selected from the group consisting of lithium, calcium, magnesium, sodium and potassium is added.