High-Performance Solid-state Zn Batteries Based on Free-standing Organic Cathode and Metal Zn Anode with Ordered Nano-architecture
The increasing demand of large-scale manufacture of wearable electronics requires applicable energy storage devices with high-performance and safety. In this paper, we reported a solid-state Zn battery based on free-standing organic cathode and metal Zn anode with ordered alignment nano-architecture. The cathode is fabricated by depositing organic nanowire arrays on carbon nanotube film via in-situ polymerization process, and the anode was prepared by electrodepositing Zn nanosheet arrays on carbon cloth. To avoid electrolyte leakage risks, the pseudo-solid-state PAAM-ZnSO4 gel electrolyte is employed, which is synthesized via a chemical cross-linking and film casting approach. The ordered aligned nanostructure of PANI nanowire arrays and zinc nanosheet arrays exhibits superior electrochemical performance, while the free-standing electrode configuration simplifies the battery fabrication process and offers excellent flexibility. The resulting solid-state Zn battery delivered a high capacity of 144 mAh/g at a current density of 0.2 A/g, a 91.1% capacity retention after 150 cycles at a current density of 0.5 A/g, and excellent flexibility under different bending states. This high-performance solid-state Zn battery provides a promising alternative of the energy storage device for the next generation wearable electronics.