| Issue |
Korean Journal of Chemical Engineering,
Vol.37, No.1, 184-187, 2020
Vol.37, No.1, 184-187, 2020
Electrochemical characteristics of high-capacity Mg/V2O5 hybrid batteries with Mg-Li dual salt electrolytes
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 2.4V (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 ~1.5V 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.
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