采用原位聚合方法对硬碳材料进行了导电聚合物包混,并测试了导电聚合物包混硬碳材料的电化学性能。利用扫描电镜,拉曼光谱,电导率仪及恒电流法研究了导电聚合物包混的硬碳材料的结构以及充放电特性。研究发现,聚苯胺、聚吡咯和聚噻吩等...采用原位聚合方法对硬碳材料进行了导电聚合物包混,并测试了导电聚合物包混硬碳材料的电化学性能。利用扫描电镜,拉曼光谱,电导率仪及恒电流法研究了导电聚合物包混的硬碳材料的结构以及充放电特性。研究发现,聚苯胺、聚吡咯和聚噻吩等均能通过原位聚合包混在硬碳表面。其中,采用噻吩在硬碳表面原位聚合增强了硬碳材料的导电性。经聚噻吩包混的硬碳首次充电容量达到了385mAh g-1以上,高于未包混的硬碳(320mAh g-1)。循环20周以后聚噻吩包混硬碳的容量仍保持在325 mAh g-1以上,而未包混硬碳的容量则降低到290 mAh g-1以下。展开更多
LiNi0.5Mn1.5O4 was synthesized by solid-state reaction with different Ni containing precursors. The effect of precursor on electrochemical performance was studied. It was demonstrated that LiNi0.5Mn1.5O4 synthesized w...LiNi0.5Mn1.5O4 was synthesized by solid-state reaction with different Ni containing precursors. The effect of precursor on electrochemical performance was studied. It was demonstrated that LiNi0.5Mn1.5O4 synthesized wi- th Ni(NO3)·26H2O as precursor had good charge-discharge performances. At the potential range of 3.0￣5.0 V, the reversible capacity of the above LiNi0.5Mn1.5O4 could reach to 145 mAh·g-1 and remained 143 mAh·g-1 after 10 cycles, while at 3.0￣4.9 V, there was still 133 mAh·g-1 reversible capacity, and was 125 mAh·g-1 after 40 cycles. XRD results indicated that the synthesized compound was with spinel structure. The precursors and dispersion method had remarkable effect on the structures of the resulting compounds. Pure spinel phase could be obtain- ed with mechanical ball-milled method and Ni(NO3)·26H2O as precursor, and trace amount of NiO phase could be detected in LiNi0.5Mn1.5O4 with simple mixture method and using Ni(CH3COO)2·6H2O, NiO and Ni2O3 as precurs- ors.展开更多
文摘采用原位聚合方法对硬碳材料进行了导电聚合物包混,并测试了导电聚合物包混硬碳材料的电化学性能。利用扫描电镜,拉曼光谱,电导率仪及恒电流法研究了导电聚合物包混的硬碳材料的结构以及充放电特性。研究发现,聚苯胺、聚吡咯和聚噻吩等均能通过原位聚合包混在硬碳表面。其中,采用噻吩在硬碳表面原位聚合增强了硬碳材料的导电性。经聚噻吩包混的硬碳首次充电容量达到了385mAh g-1以上,高于未包混的硬碳(320mAh g-1)。循环20周以后聚噻吩包混硬碳的容量仍保持在325 mAh g-1以上,而未包混硬碳的容量则降低到290 mAh g-1以下。
文摘LiNi0.5Mn1.5O4 was synthesized by solid-state reaction with different Ni containing precursors. The effect of precursor on electrochemical performance was studied. It was demonstrated that LiNi0.5Mn1.5O4 synthesized wi- th Ni(NO3)·26H2O as precursor had good charge-discharge performances. At the potential range of 3.0￣5.0 V, the reversible capacity of the above LiNi0.5Mn1.5O4 could reach to 145 mAh·g-1 and remained 143 mAh·g-1 after 10 cycles, while at 3.0￣4.9 V, there was still 133 mAh·g-1 reversible capacity, and was 125 mAh·g-1 after 40 cycles. XRD results indicated that the synthesized compound was with spinel structure. The precursors and dispersion method had remarkable effect on the structures of the resulting compounds. Pure spinel phase could be obtain- ed with mechanical ball-milled method and Ni(NO3)·26H2O as precursor, and trace amount of NiO phase could be detected in LiNi0.5Mn1.5O4 with simple mixture method and using Ni(CH3COO)2·6H2O, NiO and Ni2O3 as precurs- ors.
