No abstract

Zinc-ion batteries (ZIBs) are considered as a reasonable alternative to lithiumion batteries (LIBs) due to their satisfactory safety levels, low cost, and ecofriendliness. 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 UFMP@IQGF composite is used as a multifunctional current collector. The asfabricated ZIB exhibits a superb energy storage performance and reversibility, with an improved specific capacity of 404.7 mA h g À1 at a current density of 0.1 A g À1 , 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 À1 . Moreover, the all-solid-state ZIB using a gel-electrolyte exhibits a good energy storage performance, mechanical flexibility, and feasibility for practical applications.