A SiO2@PPy core/shell structure was synthesized by performing the polymerization of pyrrole monomers around SiO2 spheres.For the first time,the SiC hollow spheres with a high surface area was prepared from the SiO2@PP...A SiO2@PPy core/shell structure was synthesized by performing the polymerization of pyrrole monomers around SiO2 spheres.For the first time,the SiC hollow spheres with a high surface area was prepared from the SiO2@PPy with a core/shell structure by using a carbothermal reduction reaction technique.The preparation process and the structures of the products were characterized with XRD,TEM,SEM,N2 adsorption-desorption isotherms and XPS.The results indicate that β-SiC hollow spheres with a specific surface area of 101.3 m2/g could be prepared from the SiO2@PPy with a core/shell structure.展开更多
以共沉淀法制备的Ni-Mn包覆Co_3O_4前驱体和Li_2CO_3为原料,通过高温固相法制得了具有核壳结构的锂电池正极材料Li(Co_(0.9)Ni_(0.05)Mn_(0.05))O_2.用扫描电镜(SEM)、X射线能谱仪(EDS)、X射线衍射(XRD)和充放电测试表征了样品的形貌、...以共沉淀法制备的Ni-Mn包覆Co_3O_4前驱体和Li_2CO_3为原料,通过高温固相法制得了具有核壳结构的锂电池正极材料Li(Co_(0.9)Ni_(0.05)Mn_(0.05))O_2.用扫描电镜(SEM)、X射线能谱仪(EDS)、X射线衍射(XRD)和充放电测试表征了样品的形貌、晶体结构和电化学性能.结果表明,所制备的核壳结构Li(Co_(0.9)Ni_(0.05)Mn_(0.05))O_2具有良好的电化学性能,在3.0~4.5 V和3.0~4.6 V,0.2 C下首次放电容量分别达到180.5 m A·h·g^(-1)和201.3 m A·h·g^(-1),在1 C下,循环50周后容量保持率分别为89.3%和63.3%.展开更多
文摘A SiO2@PPy core/shell structure was synthesized by performing the polymerization of pyrrole monomers around SiO2 spheres.For the first time,the SiC hollow spheres with a high surface area was prepared from the SiO2@PPy with a core/shell structure by using a carbothermal reduction reaction technique.The preparation process and the structures of the products were characterized with XRD,TEM,SEM,N2 adsorption-desorption isotherms and XPS.The results indicate that β-SiC hollow spheres with a specific surface area of 101.3 m2/g could be prepared from the SiO2@PPy with a core/shell structure.
文摘以共沉淀法制备的Ni-Mn包覆Co_3O_4前驱体和Li_2CO_3为原料,通过高温固相法制得了具有核壳结构的锂电池正极材料Li(Co_(0.9)Ni_(0.05)Mn_(0.05))O_2.用扫描电镜(SEM)、X射线能谱仪(EDS)、X射线衍射(XRD)和充放电测试表征了样品的形貌、晶体结构和电化学性能.结果表明,所制备的核壳结构Li(Co_(0.9)Ni_(0.05)Mn_(0.05))O_2具有良好的电化学性能,在3.0~4.5 V和3.0~4.6 V,0.2 C下首次放电容量分别达到180.5 m A·h·g^(-1)和201.3 m A·h·g^(-1),在1 C下,循环50周后容量保持率分别为89.3%和63.3%.
