文献类型：专利

英文题名：Method for preparing silicon composite material for negative pole of lithium ion cell comprises dispersing silicon powder, heating at constant temperature, mixing with gas, feeding into thermal gas-phase deposition reactor and cooling

作者：QIAO W;LIU H;ZHANG R;ZHAN L;LIANG X;LONG D;LING L

机构：[1]UNIV EAST CHINA SCI & TECHNOLOGY

申请号：CN101265571-A

申请日：2008-04-23

公开日：2008-09-17

语种：英文

收录：DERWENT

摘要：NOVELTY - Method for preparing silicon composite material for negative pole of lithium ion cell comprises: (1) evenly dispersing silicon powder granules in deposition reaction tank; (2) heating the reactor; (3) keeping the temperature of the thermal pyrolytic charcoal precursor constant at 30-70 degrees C, mixing with inertia gas, feeding the thermal pyrolytic charcoal precursor into thermal gas-phase deposition reactor together with the inertia gas, closing the gas mixer after deposition; (4) cooling, taking out the sample and obtaining the lithium ion cell silicon composite material. USE - The method for preparing silicon composite material is used for negative pole of lithium ion cell (claimed). It is also used for electric mobile field. ADVANTAGE - The composite material prepared by the method comprises a specific capacity far more larger than the currently popular charcoal material with stable circulation function and reversible capability reaching over 1200 mAh/g, which still remains over 90% after circulation for 20 times. The method is simple with low cost. DETAILED DESCRIPTION - Method for preparing silicon composite material for negative pole of lithium ion cell comprises: (1) evenly dispersing silicon powder granules as active material in deposition reaction tank and disposing reaction tank in the deposition area of the gas-phase deposition reactor; (2) heating the reactor to a preset deposition temperature at 600-1000 degrees C at the speed of 5-30 degrees C/minute with protection of the inertia gas; (3) keeping the temperature of the thermal pyrolytic charcoal precursor constant at 30-70 degrees C, mixing with inertia gas in gas mixer, opening the gas mixer, feeding the thermal pyrolytic charcoal precursor into thermal gas-phase deposition reactor with a flux of 50-500 ml/minute together with the inertia gas, closing the gas mixer after deposition for 1-10 hours; and (4) cooling the reactor naturally to indoor temperature, taking out the sample and obtaining the lithium ion cell silicon composite material; where the material silicon powder is granule with grain size of 20 nm to 50 mu m, thermal pyrolytic charcoal precursor is benzene, toluene, naphthalene, pitch, paraffin oil, methane, or acetylene; inertia gas is nitrogen gas or argon gas.