<scp>Improved‐quality</scp> graphene film decorated with ultrafine <scp> MnO <sub>2</sub> </scp> nanoparticles as a multifunctional current collector for <scp>high‐reversibility</scp> zinc‐ion batteries
Young‐Geun Lee, Seoyeong Kim, Keun Young Lee, Yong‐Ryun Jo, Geon‐Hyoung An
Abstract
Zinc-ion batteries (ZIBs) are considered as a reasonable alternative to lithium-ion batteries (LIBs) due to their satisfactory safety levels, low cost, and eco-friendliness. Nevertheless, the ZIBs have suffered from rapid capacity fading and unstable cycling stability due to poor reversibility. To overcome this issue, a suitable current collector with high electrical conductivity and good interfacial adhesion to the electrode material is essential. Herein, for the first time, an improved-quality graphene film (IQGF) is uniformly decorated with ultrafine manganese oxide nanoparticles (UFMP) and the resulting [email protected] composite is used as a multifunctional current collector. The as-fabricated ZIB exhibits a superb energy storage performance and reversibility, with an improved specific capacity of 404.7 mA h g−1 at a current density of 0.1 A g−1, and an excellent ultrafast cycling stability, with a capacity retention of 83.7% for up to 300 cycles at a current density of 2.0 A g−1. Moreover, the all-solid-state ZIB using a gel-electrolyte exhibits a good energy storage performance, mechanical flexibility, and feasibility for practical applications.