The invention discloses a
silicon-carbon
composite material for a
lithium ion battery and a preparation method for the
silicon-carbon
composite material, and belongs to the field of
lithium ion batteries. The
silicon-carbon
composite material is characterized in that
carboxymethylcellulose sodium is used as a bonding agent, a
liquid phase coating technology is used for silicon-carbon compounding, and a
spray drying technology is used for
drying granulation to prepare the silicon-carbon composite material with uniform
granularity and excellent performance for the
lithium ion battery. The silicon-carbon composite material and the preparation method thereof have the advantages that 1, the composite material for the
lithium ion battery is prepared through a silicon-carbon compounding technology, and the capacity of the composite material is higher than that of the conventional
graphite cathode material, reaches over 500mAh / g, and can meet requirements on the growing of the market of lithium ion batteries; 2, carboxymethylcellulose is used as a bonding agent which can be effectively coated and bonded on the silicon-carbon material to prevent
efflorescence caused by silicon during charging and discharging, so that the
cycling performance of the silicon-carbon composite material is effectively improved; and 3, the
liquid phase coating and
spray drying granulation technologies are adopted, so that the silicon-carbon material can be uniformly coated and bonded, has uniform granules, and is small in specific area, and the
cycling performance of the silicon-carbon composite material is further improved.