Enhanced electrochemical properties of LaFeO<sub>3</sub> with Ni modification for MH-Ni batteries

Zhen-tao Dong; Yuan Li; Kai-liang Ren; Shu-qin Yang; Yu-meng Zhao; Yong-jie Yuan; Lu Zhang; Shu-min Han

doi:10.1007/s12613-018-1672-x

Volume 25 Issue 10

Oct. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(10): 1201-1207

Zhen-tao Dong, Yuan Li, Kai-liang Ren, Shu-qin Yang, Yu-meng Zhao, Yong-jie Yuan, Lu Zhang, and Shu-min Han, Enhanced electrochemical properties of LaFeO₃ with Ni modification for MH-Ni batteries, Int. J. Miner. Metall. Mater., 25(2018), No. 10, pp. 1201-1207. https://doi.org/10.1007/s12613-018-1672-x

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Zhen-tao Dong, Yuan Li, Kai-liang Ren, Shu-qin Yang, Yu-meng Zhao, Yong-jie Yuan, Lu Zhang, and Shu-min Han, Enhanced electrochemical properties of LaFeO3 with Ni modification for MH-Ni batteries, Int. J. Miner. Metall. Mater., 25(2018), No. 10, pp. 1201-1207. https://doi.org/10.1007/s12613-018-1672-x

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Research Article

Enhanced electrochemical properties of LaFeO₃ with Ni modification for MH-Ni batteries

+ Author Affiliations

Corresponding author:
Shu-min Han E-mail: hanshm@ysu.edu.cn
Received: 5 January 2018; Revised: 8 June 2018; Accepted: 11 June 2018

Abstract

Abstract

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.
- LaFeO₃;
- nickel modification;
- electrochemical performances;
- MH-Ni batteries

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