| Enhanced electrochemical properties of LaFeO3 with Ni modification for MH-Ni batteries |
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| 作者姓名： | Zhen-tao Dong Yuan Li Kai-liang Ren Shu-qin Yang Yu-meng Zhao Yong-jie Yuan Lu Zhang Shu-min Han |
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| 作者单位： | State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China |
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| 基金项目： | This work was financially supported by the National Natural Science Foundation of China;the National Postdoctoral Pro-gram for Innovative Talents of China;the Innovation Fund for the Graduate Students of Hebei Province |
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| 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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| 关 键 词： | LaFeO3 nickel modification electrochemical performances MH-Ni batteries |
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