Polypyrrole incorporated a novel ZnMn2O4 cathode for high-energy quasi-solid state zinc-ion battery.

A reliable and high-rate cathode is needed to study rechargeable zinc-ion batteries (ZIBs). Spinel ZnMn₂O₄ (ZMO) has special benefits that make it an attractive cathode material for ZIBs, including high availability, cheap cost, and environmental friendliness. However, because of its poor electronic conductivity and significant volume change throughout the charge/discharge process, it significantly limits both rate capability and lifespan. In this article, high-performance cathodes for rechargeable ZIBs are made using a new conductive polymer that is composed of ZMO and polypyrrole (ZMOP). The ZMOP cathode performs as predicted, with a huge specific capacity (213 mA h⁻¹ at 0.1 Ag⁻¹), good rate capability (119 mAhg⁻¹ at 2 Ag⁻¹), and exceptional durability over time (93% retention and 99.4% columbic efficiency after 2000 cycles). Additionally, quasi-solid-state ZIBs are created using an energy density (206 W h kg⁻¹), and power density (0.18 kW kg⁻¹). [ABSTRACT FROM AUTHOR]