Using tetramethylammonium hydroxide electrolyte to inhibit corrosion of Mg-based amorphous alloy anodes: A route for promotion energy density of Ni-MH battery
作者:
Huang, JL (Huang, Jianling) [1] , [2] ; Liao, CW (Liao, ChengWei) [1] ; Wang, H (Wang, Hui) [1] ; Zhao, YJ (Zhao, YuJun) [1] ; Ouyang, LZ (Ouyang, Liuzhang) [1] ; Liu, JW (Liu, Jiangwen) [1] ; Zhu, M (Zhu, Min) [1]
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卷907
文献号164293
DOI10.1016/j.jallcom.2022.164293
出版时间JUN 25 2022
已索引2022-04-26
文献类型Article
摘要
Mg-based alloy anodes suffer from severe corrosion in conventional electrolytes (KOH solution) and this substantially obstructs the cycle life, which is a great challenge for using them in the Ni-MH battery. Herein, a high concentration tetramethylammonium hydroxide (TMAH) aqueous electrolyte with a special hydrate structure is explored and enables excellent cycle stability and high capacity for Mg-based alloy anodes. In this electrolyte, the Mg0.4Ti0.1Ni0.5 alloy anode delivers a maximum discharge capacity of 466 mAh g-1, and maintains 210 mAh g-1 after 100 cycles owing to the reduced corrosion rate, which are much better than that in 6 M KOH electrolyte, being 425 mAh g-1 and 69 mAh g-1, respectively. Furthermore, by in-situ forming Cu coating on the Mg0.4Ti0.1Ni0.5 electrode surface during charging process with the adding 0.01 M of Cu(OH)2 in TMAH electrolyte, the corrosion of the electrode is further suppressed and the reversible capacity can reach 313 mAh g-1 after 100 cycles. The high conducting Cu coating can also increase the rate capability of the electrode by promoting the charge transfer. Thus, using TMAH electrolytes provides a new approach to promote the electrochemical performances of Ni-MH batteries with Mg-based alloy anodes.(c) 2022 Published by Elsevier B.V.
关键词
作者关键词Mg-based alloyHydrogen storage alloysNi-MH batteryTMAH electrolyte
Keywords PlusIMPROVED ELECTROCHEMICAL PROPERTIESHYDROGEN STORAGEPARTIAL SUBSTITUTIONCAPACITYPERFORMANCEMECHANISMPHASENANOCRYSTALLINEIMPEDANCECR
作者信息
通讯作者地址
Zhu, Min
(通讯作者)
South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China
地址
1 South China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China
2 Guangxi Univ Sci & Technol, Guangxi Key Lab Automobile Components & Vehicle T, Liuzhou 545006, Peoples R China
电子邮件地址memzhu@scut.edu.cn
类别/分类
研究方向ChemistryMaterials ScienceMetallurgy & Metallurgical Engineering