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首页> 外文期刊>Batteries >Effects of Vanadium/Nickel Contents in Laves Phase-Related Body-Centered-Cubic Solid Solution Metal Hydride Alloys
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Effects of Vanadium/Nickel Contents in Laves Phase-Related Body-Centered-Cubic Solid Solution Metal Hydride Alloys

机译：Laves相相关的体心立方固溶体金属氢化物合金中钒/镍含量的影响

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摘要

Structural, gaseous phase hydrogen storage, and electrochemical properties of a series of annealed (900 °C for 12 h) Laves phase-related body-centered-cubic (BCC) solid solution metal hydride (MH) alloys with vanadiumickel (V/Ni) contents ranging from 44/18.5 to 28/34.5 were studied. As the average Ni-content increases, C14 phase evolves into the C15 phase and a new σ-VNi phase emerges; lattice constants in BCC, C14, and TiNi phase all decrease; the main plateau pressure increases; both gaseous phase and electrochemical hydrogen storage capacities decrease; the pressure-concentration-temperature (PCT) absorption/desorption hysteresis decreases; both high-rate dischargeability (HRD) and bulk hydrogen diffusivity increase and then decrease; and the surface reaction current decreases. There is a capacity-rate tradeoff with the change in V/Ni content. Alloys with relatively lower Ni-content show higher capacities but inferior high-rate performance compared to commercially available AB5 MH alloy. Increasing the Ni-content in this BCC-based multi-phase alloy can improve the high-rate capability over AB5 alloy but with lower discharge capacities. The inferior surface reaction current in these alloys, compared to AB5, may be due to the smaller surface area, not the total volume, of the Ni clusters embedded in the surface oxide layer of the activated alloys.
机译：一系列退火（900℃，持续12 h）与钒/镍（V / Ni）含量范围从44 / 18.5到28 / 34.5。随着平均Ni含量的增加，C14相演变为C15相，并出现新的σ-VNi相。 BCC，C14和TiNi相的晶格常数均降低;主要高原压力增加;气相和电化学储氢能力均下降;压力-浓度-温度（PCT）吸收/解吸滞后减小。高倍率放电率（HRD）和大体积氢扩散率均先升高后降低。并且表面反应电流减小。 V / Ni含量的变化会影响容量/速率。与市售的AB 5 MH合金相比，Ni含量相对较低的合金具有更高的容量，但其高倍率性能却较差。增加这种BCC基多相合金中的Ni含量可提高其对AB 5 合金的高倍率性能，但放电容量较低。与AB 5 相比，这些合金的表面反应电流较差，可能是由于嵌入活性合金的表面氧化物层中的Ni团簇的表面积较小，而不是总体积较小。

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