The invention relates to a different-orientation spherical
natural graphite negative
electrode material and a preparation method thereof. The method comprises the following steps: mixing natural crystalline
flake graphite micro
powder and dispersion medium; adding deflocculants for regulating the
solid content; then, placing materials and bonding agents into a pulp mixing
machine to be stirred; carrying out atomization,
drying and
granulation on the pulp on a spraying
drying machine to obtain powdery materials; carrying out heat treatment on the powdery materials in
nitrogen gas
atmosphere through a revolving furnace; and cooling the obtained
powder to obtain the different orientation spherical
natural graphite negative
electrode material. The
graphite negative
electrode material consists of a plurality of layered
graphite crystalline flakes, and the layered
graphite crystalline flakes are glued and have different orientations. The graphite negative
electrode material prepared by the method of the invention has the obvious characteristics that the specific capacity of the material is high, the circulation stability is high, the
micro spheres formed by the graphite flakes of the graphite with different orientations can effectively inhabit the layer flake peeling caused by deep
lithium insertion, the graphite flake adhesion and the carbon coverage can be realized at the same time, the
powder agglomeration can be avoided through dynamic
sintering, and the invention is favorable for obtaining the spherical
natural graphite micro powder with uniform
granularity.