Enhanced electrochemical properties of LaFeO3 with Ni modification for MH–Ni batteries
来源期刊：International Journal of Minerals Metallurgy and Materials2018年第10期
论文作者：Zhen-tao Dong Yuan Li Kai-liang Ren Shu-qin Yang Yu-meng Zhao Yong-jie Yuan Lu Zhang Shu-min Han
文章页码：1201 - 1207
摘 要：In this work,we synthesized LaFeO3–xwt%Ni（x=0,5,10,15）composites via a solid-state reaction method by adding Ni to the reactants,La2O3 and Fe2O3.Field-emission scanning electron microscopy（FE-SEM）and energy-dispersive X-ray spectroscopy（EDS）results revealed that Ni powders evenly dispersed among the LaFeO3 particles and apparently reduced their aggregation,which imparted the composites with a loose structure.Moreover,the Ni formed a conductive network,thus improving the conductivity of the composites.The maximum discharge capacity of the LaFeO3 electrodes remarkably increased from 266.8 mAh·g–1（x=0）to 339.7 mAh·g–1（x=10）.In particular,the high-rate dischargeability of the LaFeO3–10wt%Ni electrode at a discharge current density of 1500 mA·g-1 reached 54.6%,which was approximately 1.5 times higher than that of the pure LaFeO3.Such a Ni-modified loose structure not only increased the charge transfer rate on the surface of the LaFeO3 particles but also enhanced the hydrogen diffusion rate in the bulk LaFeO3.
Zhen-tao Dong1,2，Yuan Li2，Kai-liang Ren2，Shu-qin Yang2，Yu-meng Zhao2，Yong-jie Yuan2，Lu Zhang1，Shu-min Han1,2
1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University2. College of Environmental and Chemical Engineering, Yanshan University
摘 要：In this work,we synthesized LaFeO3–xwt%Ni（x=0,5,10,15）composites via a solid-state reaction method by adding Ni to the reactants,La2O3 and Fe2O3.Field-emission scanning electron microscopy（FE-SEM）and energy-dispersive X-ray spectroscopy（EDS）results revealed that Ni powders evenly dispersed among the LaFeO3 particles and apparently reduced their aggregation,which imparted the composites with a loose structure.Moreover,the Ni formed a conductive network,thus improving the conductivity of the composites.The maximum discharge capacity of the LaFeO3 electrodes remarkably increased from 266.8 mAh·g–1（x=0）to 339.7 mAh·g–1（x=10）.In particular,the high-rate dischargeability of the LaFeO3–10wt%Ni electrode at a discharge current density of 1500 mA·g-1 reached 54.6%,which was approximately 1.5 times higher than that of the pure LaFeO3.Such a Ni-modified loose structure not only increased the charge transfer rate on the surface of the LaFeO3 particles but also enhanced the hydrogen diffusion rate in the bulk LaFeO3.
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