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Electrochemical characteristics of high-capacity Mg/V 2 O 5 hybrid batteries with Mg-Li dual salt electrolytes
Korean Journal of Chemical Engineering ( IF 2.476 ) Pub Date : 2020-01-08 , DOI: 10.1007/s11814-019-0421-9
Haebeen Kim; Duri Kim; Min Young Hong; Ji Heon Ryu

Mg-Li hybrid cells are constructed and evaluated using a V2O5 positive electrode, a Mg metal negative electrode, and Mg-Li dual salt electrolytes. When a crystalline V2O5 (c-V2O5) and an Al current collector are used, side reactions can occur even at the upper voltage limit of 2.4 V (vs. Mg/Mg2+). However, when an amorphous V2O5 (a-V2O5) is used with a Ti current collector, the side reactions are greatly reduced and the cycle performance is improved. The discharge capacity and Coulombic efficiency at the second cycle are 187 mA h g−;1 and 94.9%, respectively. a-V2O5 is more electrochemically stable than c-V2O5, the Mg/a-V2O5 cell shows a discharge voltage of ∼1.5 V and a specific capacity of 148 mA h g−1 even after 20 cycles. Therefore, the a-V2O5 is a potential host material for Mg-Li hybrid batteries.
更新日期:2020-01-08

 

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