纳米硅/导电聚合物复合负极的制备与性能  

Synthesis and performance of nano-silicon/conducting polymer composite anode

作　　者：陈启多 韩凯[1] 程君 叶红齐[1] CHEN Qi-duo;HAN Kai;CHENG Jun;YE Hong-qi(College of Chemistry and Chemical Engineering,Central South University,Changshd,Hunan 410083,China;Shanghai eTrust Power Group Ltd.,Shanghai 201800,China)

机构地区：[1]中南大学化学化工学院,湖南长沙410083 [2]上海力信能源科技有限责任公司,上海201800

出　　处：《电池》2019年第1期3-7,共5页Battery Bimonthly

基　　金：国家自然科学基金(21706292);湖南省自然科学基金(2017JJ3376)

摘　　要：以商业低成本铝硅合金粉为硅源,利用酸蚀法制备纳米硅(Si)颗粒,通过原位聚合法制得3种纳米硅/导电聚合物复合材料:硅/聚吡咯(Si@PPy)、硅/聚苯胺(Si@PANl)和硅/聚3,4-乙烯二氧噬吩(Si@PEDOT)等导电聚合物包覆不仅可为硅颗粒提供导电网络,而且能够缓冲硅颗粒在充放电过程中的体积膨胀以500mA/g妁电流,在0.005-1.500V充放电,Si@PPy、Si@PANI和Si@PEDOT的首次可逆比容量分别为1526mAh/g、845mAh/g和592mAh/g,第100次循环的比容量分别为1265mAh/g,610mAh/g和558mAh/g,平均库仑效率约99%,比容量与循环性能较未包覆的纯硅得到改善.Lsing low-cost commercial Al-Si alloy powder as silicon source, silicon nanoparticles were synthesized via acid etching method. Three types of silicon/conductive polymer composites were prepared by in situ polymerization process, including Si@PPy , Si@PANI and Si@PEDOT. The coating of conductive polymers not only provided conducting network for silicon particles, but also accommodated the volume expanding for silicon particles during charge-discharge processes. Si@PPy , Si@PANI and Si@PEDOT delivered initial specific reversible capacities of 1 526 mAh/g, 845 mAh/g and 592 mAh/g at 500 mA/g in 0.005 - 1.500V, respectively. The specific capacities remained 1 265 niAh/g,610 mAh/g and 558 mAh/g at the 100th cycle with the average Coulombic efficiencies of about 99%. Comparing to uncoated pure Si ,the capacity and cycle performance of composites was improved.

关 键 词：铝硅合金粉 酸蚀法 纳米硅 导电聚合物 负极材料 

分 类 号：TM912.9[电气工程—电力电子与电力传动]