Fig. 6: Fabrication of stretchable Zn||MnO2 batteries with strain-resilient performance.
a SEM images of a stretchable Zn negative electrode at its relaxed state and under 300% elongation. Zn microflakes were securely attached under 300% elongation. b SEM images of a stretchable MnO2 positive electrode at its relaxed state and under 300% elongation. MnO2 nanocrystals were securely attached under 300% elongation. c CV curves of a stretchable Zn negative electrode at its relaxed state and under 300% elongation at 1 mV s–1 under 25 °C. d CV curves of a stretchable MnO2 positive electrode at its relaxed state and under 300% elongation at 1 mV s–1 under 25 °C. e Schematic illustration and digital images of a stretchable Zn||MnO2 battery filled with gel electrolyte under different uniaxial elongations. f GCD profiles of a stretchable Zn||MnO2 battery at its relaxed state and under 300% elongation with different specific currents from 100 to 600 mA gMnO2–1 under 25 °C. g Specific capacity and CE retention of stretchable Zn||MnO2 batteries at the relaxed state and under 300% elongation, measured at a specific current of 200 mA gMnO2–1 under 25 °C. The inset highlights CEs in the range of 98%–100% over 200 cycles. (h) Areal capacities comparison between our stretchable Zn||MnO2 battery and the state-of-the-art rechargeable and stretchable Zn-based and Li-ion batteries.
