文章摘要
石墨烯/SnO2/Si@PPy复合材料制备及电化学性能
Preparation and Electrochemical Performance of Graphene/SnO2/Si@PPy Composite
投稿时间:2019-06-10  修订日期:2019-07-24
DOI:
中文关键词: 石墨烯    聚吡咯  负极材料  锂离子电池
英文关键词: graphene  silicon  polypyrrole  anode materials  lithium ion battery
基金项目:
作者单位E-mail
王珏 黑龙江省科学院高技术研究院 wangjue122@126.com 
于平 黑龙江省科学院高技术研究院  
付东 黑龙江省科学院高技术研究院  
张晓臣 黑龙江省科学院高技术研究院  
张伟君 黑龙江省科学院高技术研究院  
阚侃 黑龙江省科学院高技术研究院 kankan.has@foxmail.com 
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中文摘要:
      以氧化石墨烯和SnCl2为原料,通过微波水热法合成了石墨烯/SnO2复合材料(GS),以过硫酸铵为引发剂,通过吡咯在Si粉表面原位氧化聚合制备了Si@PPy包覆结构(SP),最后通过微波水热组装法制备了石墨烯/SnO2/Si@PPy复合材料(GSSP)。采用SEM、TEM、XRD、Raman和BET对GS、SP和GSSP材料的形貌和结构进行表征,并以GSSP复合材料为负极组装半电池进行倍率、循环、CV和EIS等电化学性能测试。结果表明:GSSP复合材料具有优异的倍率性能,在100 mA/g电流密度下,放电和充电的平均比容量分别为948.44和869.63 mAh/g。1000 mA/g电流密度下,经过400次循环放电和充电的比容量保持率高达90.69%和89.34%。
英文摘要:
      Graphene/SnO2 (GS) composites were synthesized from graphene oxide and SnCl2 by microwave hydrothermal method. Using ammonium persulfate as initiator, the coating structure of Si@PPy (SP) was prepared by in situ oxidation polymerization of pyrrole on the surface of Si powders. Graphene/SnO2/Si@PPy (GSSP) composites were prepared by microwave hydrothermal assembly method. The morphology and structure of GS, SP and GSSP were characterized by SEM, TEM, XRD, Raman and BET. The half-cells were assembled with GSSP composite as anode, and then the electrochemical properties were tested, such as rate performance, cyclic performance, CV and EIS. The results showed that the GSSP composite had excellent rate performance. At a current density of 100 mA/g, the average specific capacity of discharge and charge is 948.44 mAh/g and 869.63 mAh/g, respectively. Under the current density of 1000 mA/g, the specific capacity retention rate after 400 cycles of discharge and charge was up to 90.69% and 89.34%.
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