{"title":"Galvanostatic and EIS studies of the LaNi3.55Mn0.4Al0.3Co0.75 metal hydride anode during cycling","authors":"Wissem Zayani, C. Khaldi, J. Lamloumi","doi":"10.1109/IREC56325.2022.10002089","DOIUrl":null,"url":null,"abstract":"The electrochemical properties of LaNi<inf>3.55</inf>Mn<inf>0.4</inf>Al<inf>0.3</inf>Co<inf>0.75</inf> alloy used as an anode in nickel-metal hydride batteries were investigated at ambient temperatures. Several techniques, such as the galvanostatic charging and discharging and electrochemical impedance spectroscopy (EIS) were applied to characterize these electrochemical properties. The discharge capacity of the LaNi<inf>3.55</inf>Mn<inf>0.4</inf>Al<inf>0.3</inf>Co<inf>0.75</inf> alloy increases to reach 337 mAh g<sup>−1</sup> after 6 cycles and decreases to 300 mAh g<sup>−1</sup> after 25 cycles then stabilizes around this same value indicating good cycling held.The EIS study shows a clear dependence on cycling especially for the semicircle in the low frequency region. The contribution of this semicircle decreases considerably during cycling: from 117 Ω cm<sup>2</sup> for the raw material to 7Ω cm<sup>2</sup> after 23 cycles. This reflects a significant change in the extracted values from this region.","PeriodicalId":115939,"journal":{"name":"2022 13th International Renewable Energy Congress (IREC)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2022 13th International Renewable Energy Congress (IREC)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/IREC56325.2022.10002089","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2
Abstract
The electrochemical properties of LaNi3.55Mn0.4Al0.3Co0.75 alloy used as an anode in nickel-metal hydride batteries were investigated at ambient temperatures. Several techniques, such as the galvanostatic charging and discharging and electrochemical impedance spectroscopy (EIS) were applied to characterize these electrochemical properties. The discharge capacity of the LaNi3.55Mn0.4Al0.3Co0.75 alloy increases to reach 337 mAh g−1 after 6 cycles and decreases to 300 mAh g−1 after 25 cycles then stabilizes around this same value indicating good cycling held.The EIS study shows a clear dependence on cycling especially for the semicircle in the low frequency region. The contribution of this semicircle decreases considerably during cycling: from 117 Ω cm2 for the raw material to 7Ω cm2 after 23 cycles. This reflects a significant change in the extracted values from this region.
研究了LaNi3.55Mn0.4Al0.3Co0.75合金作为镍氢电池负极材料在常温下的电化学性能。采用恒流充放电和电化学阻抗谱(EIS)等技术对其进行了表征。LaNi3.55Mn0.4Al0.3Co0.75合金的放电容量在6次循环后增加到337 mAh g−1，在25次循环后下降到300 mAh g−1，然后稳定在同一值附近，表明循环保持良好。EIS研究表明，低频区域的半圆明显依赖于循环。这个半圆的贡献在循环过程中显著减少:从117 Ω cm2的原料到7Ω cm2循环23次后。这反映了从该区域提取的值发生了重大变化。
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