首页|Using tetramethylammonium hydroxide electrolyte to inhibit corrosion of Mg-based amorphous alloy anodes: A route for promotion energy density of Ni-MH battery
Using tetramethylammonium hydroxide electrolyte to inhibit corrosion of Mg-based amorphous alloy anodes: A route for promotion energy density of Ni-MH battery
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NSTL
Elsevier
? 2022 Elsevier B.V.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.
Huang J.、Liao C.、Wang H.、Zhao Y.、Ouyang L.、Liu J.、Zhu M.
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School of Materials Science and Engineering Key Laboratory of Advanced Energy Storage Materials of Guangdong Province South China University of Technology
NSTL
Elsevier
