当前位置: X-MOL 学术J. Iron Steel Res. Int. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Structure and electrochemical characteristics of Mg–Ti–Ni-based electrode alloys synthesized by mechanical milling
Journal of Iron and Steel Research International ( IF 2.5 ) Pub Date : 2021-01-16 , DOI: 10.1007/s42243-020-00547-1
Zhong-hui Hou , Xin Wei , Wei Zhang , Ze-ming Yuan , Hui Yong , Qi-lu Ge

The vacuum induction melting was adopted to fabricating Mg50−xTixNi45Al3Co2 (x = 0, 1, 2, 3, 4 at.%) composites protected by the high-purity helium atmosphere. Subsequently, the surface modification treatment of the as-cast alloys was carried out by mechanically coating nickel. The amorphous and nanocrystalline Mg50−xTixNi45Al3Co2 (x = 0–4) + 50 wt.% Ni hydrogen storing alloys as the negative materials in batteries were prepared through ball milling, and the influences of milling time and Ti dosage on the structure and electrochemical hydrogen storing behaviors of the corresponding samples were studied in detail. The electrochemical testing reveals that the as-milled alloys have excellent performances and can finish the electrochemical hydrogenation and dehydrogenation at indoor temperature. In the first cycle without activation, the ball milling alloy obtains the maximum value of discharge capacity. Discharge capacity and cyclic steadiness of the composites conspicuously grow as Ti content and milling duration increase. Concretely, the capacity retaining rate at 100th cycle and the discharge capacity of 30 h milling samples augment from 53% to 78% and from 435.2 to 567.2 mAh/g with changing Ti content from 0 to 4. The same performances of the alloy (x = 4) are enhanced from 61% to 78% and from 379.9 to 567.2 mAh/g, respectively, with extending milling duration. Moreover, high rate discharge ability, potential-step measurements, potentiodynamic polarization curves and electrochemical impedance spectrum manifest that the electrochemical kinetics properties can achieve significant amelioration as Ti content varies and milling duration is extended.



中文翻译:

机械研磨合成的Mg-Ti-Ni基电极合金的结构和电化学特性

采用真空感应熔炼来制备 受高纯氦气氛保护的Mg 50- x Ti x Ni 45 Al 3 Co 2x = 0、1、2、3、4 at。%)复合材料。随后,通过机械涂覆镍对铸态合金进行表面改性处理。非晶和纳米晶Mg 50− x Ti x Ni 45 Al 3 Co 2x = 0–4)+ 50%(重量)的Ni贮氢合金作为电池负极材料,通过球磨制备,研究了铣削时间和Ti用量对相应样品的结构和电化学贮氢性能的影响。详情。电化学测试表明,铣削后的合金具有优异的性能,可以在室温下完成电化学加氢和脱氢。在没有激活的第一个循环中,球磨合金获得最大放电容量值。随着Ti含量和研磨时间的增加,复合材料的放电容量和循环稳定性显着提高。具体而言,第100个循环的容量保持率和30小时研磨样品的放电容量从53%增加到78%,从435.2增加到567。x  = 4)随研磨时间的延长而分别从61%提高到78%和从379.9 mAh / g提高到567.2 mAh / g。此外,高速率放电能力,电势阶跃测量,电位动力学极化曲线和电化学阻抗谱表明,随着Ti含量的变化和研磨时间的延长,电化学动力学特性可以显着改善。

更新日期:2021-01-18
down
wechat
bug