热等离子法制备锂离子电池硅碳负极材料  

Preparation of Silicon/Carbon Anodes Material by Thermal PlasmaMethod for Lithium-ion Battery Application

作　　者：乔亚峰 万小涵 马文会[1,2] 李绍元 席风硕[1] QIAO Yafeng;WAN Xiaohan;MA Wenhui;LI Shaoyuan;XI Fengshuo(Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China;Pu′er University,Pu′er 665000,China)

机构地区：[1]昆明理工大学冶金与能源工程学院,昆明650093 [2]普洱学院,云南普洱665000

出　　处：《有色金属工程》2023年第8期28-35,共8页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助项目(51904134);云南省基础研究计划(202101AT070092);云南省重点研发计划(202103AA080006)。

摘　　要：采用直流电弧热等离子法一步制备硅/碳球形纳米复合材料。以中值粒径分别为2.6、6.5和15.0μm的硅碳混合粉末为原料,制得了中值粒径为49.9、56.3和68.9 nm的纳米硅碳复合材料;在200 mA/g的电流密度下3种不同粒径的纳米硅碳负极材料的首次放电比容量分别达到1718、1651和1343 mAh/g,50次循环后其容量保持在1005、761和663 mAh/g;而未处理的硅碳混合粉末首次放电容量约为2321 mAh/g,但50次循环后,容量仅为274 mAh/g。由此可见,利用直流电弧热等离子法制备的硅/碳球形纳米复合材料的电化学性能得到了极大的提升。One-step preparation of silicon/carbon spherical nanocomposites was carried out by direct current arc thermal plasma method.The Si/C nanocomposites with median particle sizes of 49.9,56.3 and 68.9 nm were produced from Si/C mixed powders with median particle sizes of 2.6,6.5 and 15.0μm,respectively.The first discharge specific capacities of these three Si/C nanocomposite electrodes at a current density of 200 mA/g reached 1718,1651,1343 mAh/g,and their capacities remained at 1005,761,663 mAh/g after 50 cycles.For comparison the first discharge capacity of the untreated silicon-carbon mixed powder was about 2321 mAh/g,but dramatically dropped to 274 mAh/g after 50 cycles.Apparently,the electrochemical performance was significantly improved by the Si/C spherical nanocomposites synthesized by the direct current arc thermal plasma approach.

关 键 词：热等离子法 一步法 锂离子电池 硅碳负极 

分 类 号：TQ152[化学工程—电化学工业]