高容量硅基负极材料及其厚膜成型技术和性能  

Thick electrode forming technology and properties of high capacity silicon-based anode materials

作　　者：丁波 蔡振飞 马扬洲 张世宏[1] 宋广生 DING Bo;CAI Zhenfei;MA Yangzhou;ZHANG Shihong;SONG Guangsheng(Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials,Ministry of Education,School of Materials Science and Engineering,Anhui University of Technology,Maanshan 243000,Anhui,China;Shaanxi Province Advanced Energy Storage Electronic Materials and Devices Engineering Research Center,Xi'an Jiaotong University,Xi'an 710049,Shaanxi,China)

机构地区：[1]安徽工业大学材料科学与工程学院先进金属材料绿色制备教育部重点实验室,安徽马鞍山243000 [2]西安交通大学陕西省先进储能电子材料与器件工程研究中心,陕西西安710049

出　　处：《精细化工》2020年第10期2090-2098,共9页Fine Chemicals

基　　金：高端外专项目(G20190219004);安徽省自然科学基金面上项目(1908085ME151);安徽省高端人才项目(DT18100044)。

摘　　要：为了缓解硅基负极材料的体积膨胀并改善其电化学性能,以Mg、SiO和石墨(G)为原料,成功制备出一种多相Si-MgO-G复合材料。探讨了不同高能球磨工艺对Mg和SiO反应程度的影响及厚膜成型技术的应用。结果表明,当高能球磨(1+5)h后,Mg和SiO原位反应生成Si-MgO产物,将反应产物与石墨混磨制备成多相Si-MgO-G复合材料。用XRD、SEM和TEM等手段对制得材料的结构、形貌和成分进行分析,证实了复合材料是由Si、MgO和石墨组成,其中Si(220)//MgO(200)之间存在晶面共格关系。用CV和EIS等对捏合开炼厚膜技术制得负极极片进行电化学性能分析,结果表明,捏合开炼工艺制备的厚膜极片的厚度、活性物质载量和首圈面积比容量分别约为薄膜极片的7.4倍、6.0倍和6.2倍。简单、绿色的厚电极制备技术可提高锂离子电池的面积比容量。In order to alleviate the volume expansion and achieve the improvement electrochemical properties of silicon-based anode materials,a multiphase Si-MgO-G composite material was prepared using Mg,SiO and graphite as raw materials.The effect of different high energy ball milling process on the reaction degree of Mg and SiO were studied,and the application of thick electrode forming technology was discussed.The results showed that after high-energy ball milling for(1+5)h,Mg and SiO reacted in situ to produce Si-MgO product,and the reaction product was then mixed with graphite to prepare multiphase Si-MgO-G composite materials.The structure,morphology and phase constitution of the prepared silicon-based anode composite materials were characterized by XRD,SEM and TEM.It was found that the composite was composed of Si,MgO and graphite,and there was an interface coherent relationship of Si(220)//MgO(200).The electrochemical performances were analyzed by CV and EIS.The results indicated that the thickness,active material load and first area specific capacity of the SMG-6 h thick electrode prepared by kneading and open milling process were about 7.4,6.0 and 6.2 times of the thin electrode.This process demonstrates that simple,green thick electrode forming technique can increase the area specific capacity of lithium-ion batteries.

关 键 词：高能球磨 捏合开炼 硅基负极材料 氧化亚硅 锂离子电池 有机电化学与工业 

分 类 号：TQ645.56[化学工程—精细化工] TB34[一般工业技术—材料科学与工程]