Abstract：Abstract: Ti1.1-xFe0.6Ni0.3Zr0.1Mn0.2Lax (x=0,0.02,0.04,0.06,0.08) alloy was produced by vacuum induction melting method, and the microstructure and electrochemical properties of the alloy were analyzed by X-ray diffractometer (XRD), scanning electron microscope (SEM), LAND cell test system and electrochemical workstation. XRD results show that: the main phase of the alloy is Ti(Fe,Ni) phase, the secondary phase is ZrMn2, the addition of La does not change the phase composition, the cell volume increases significantly with the increase of the addition; SEM analysis shows that the matrix is TiFe phase with solid solution of Ni, a large amount of ZrMn2 is distributed on the surface of the matrix, and La is polarized in the interstices of the two phases in a granular form. Electrochemical performance test shows that: the series of alloy activation performance is excellent, reach the maximum discharge capacity at the first activation, the maximum specific capacity alloy after substitution is 120.5mAh/g, cycle performance are also improved; high rate discharge test shows that: the alloy high rate discharge performance is poor, La substitution has improved, but the effect is not large, x = 0.06 has the highest level, electrochemical kinetic influence factors such as charge transfer rate, ultimate current density (IL) and hydrogen diffusion coefficient (D) have a similar trend of performance.
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2022, Vol. 29 