An international group of researchers has demonstrated an aqueous zinc battery with excellent performance in terms of capacity, rate capability, specific energy, and output voltage. The supercapacitor-battery hybrid device has also shown unprecedented cycling stability 99.2% capacity retention after 17,000 cycles at 100% depth of discharge.
It delivered excellent capacity (356 mA h g−1 cathode at 12 A g−1) and rate capability (108 mA h g−1 cathode at 300 A g−1), extremely high specific energy (568 W h kg−1 cathode), and specific power (429 kW kg−1 cathode), along with a high output voltage (1.8 V).
In addition, the device exhibited what is termed as “unprecedented cycling stability” with 99.2% capacity retention after 17,000 cycles at 100% depth of discharge, thanks to an electrochemical pulse-driven regenerative mechanism.
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