Excellent Rechargeability of Zinc Film Electrode Produced by Electrodeposition for Zinc Secondary Batteries

We demonstrated that the electrodeposited zinc film on copper substrate has stable charge-discharge performance over 5,500 cycles at 1 C rate in zinc-nickel secondary battery (ZNB), keeping the discharge capacity more than 90% of the initial one (1). A further development on the composition, structure, and cyclability of the zinc film electrode has been done and the obtained electrode no longer needs the copper substrate, which means the zinc film works as both the active mass and the current collector. This paper presents the charge-discharge performance of ZNB using the substrate-less zinc electrode, and the results show the discharge capacity data maintaining 100% of the initial value and no significant change in charge-discharge voltage even after 2,000 cycles at high C rates.

Reference (1) M. Morimitsu, Patent No. WO-A1-2021/049609.