The influence of ball milling time on the microstructure and electrochemical properties of TiFe-type alloy

doi:10.19799/j.cnki.2095-4239.2020.0245

Abstract

Abstract:

A Ti_1.06Pr_0.04Fe_0.6Ni_0.3Zr_0.1Mn_0.2 alloy was prepared by vacuum induction and high energy ball milling, and the effect of ball milling time on the phase composition, microstructure, and electrochemical properties was studied by X-ray diffraction (XRD), scanning electron microscope (SEM), and in a LAND battery test system. The studies indicated that the main phase in the as-cast alloy was TiFe and the secondary phase was ZrMn₂. Ball milling causes the formation of an amorphous structure, as the lattice parameter and cell volume decreased with increased ball milling time. SEM analysis showed that the particle size becomes smaller with increased milling time. Electrochemical performance tests indicated that the activation of alloys and the electrochemical discharge capacity were significantly improved by ball milling. The discharge capacity of as-milled alloys was 52.8 mA·h/g, higher than the as-cast alloy. The maximum discharge capacity was 170.7 mA·h/g with a milling time of five hours. The P-C-T curves indicated that the plateau of hydrogenation was elevated with the milling time, and a hysteretic pressure of hydrogenation/dehydrogenation was also observed with the milling time.

Key words: TiFe-type alloy, ball milling time, microstructure, electrochemical properties

CLC Number:

TG 139.7

Tingting ZHAI, Zhonggang HAN, Zeming YUAN, Yanghuan ZHANG. The influence of ball milling time on the microstructure and electrochemical properties of TiFe-type alloy[J]. Energy Storage Science and Technology, 2021, 10(1): 163-169.

Figures/Tables 8

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晶格常数	a/?	b/?	c/?	V/?³
标准卡片	2.976	2.976	2.976	26.36
0 h	3.0033	3.0033	3.0033	27.109
5 h	2.999	2.999	2.999	26.981
10 h	2.995	2.995	2.995	26.874
15 h	2.993	2.993	2.993	26.837

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