Fluorine-doped MnO2 with oxygen vacancy for stabilizing Zn-ion batteries
Herein,F-doped MnO2 with abundant oxygen vacancy(named F-MnO2)was synthesized by an efficient and simple one-step hydrothermal method.The introduced oxygen vacancy and pre-intercalated F-doping play a vital role in improving the electrical conductivity of F-MnO2 and facilitating ion diffusion,contributing to enhanced rate capability.In addition,the F doping results in the formation of F—Mn bonds,which can effectively inhibit the Jahn-Teller distortion of Mn3+in the discharge product,thus improving the structural stability.Benefiting from these synergic effects,the assembled Zn‖F-MnO2 full battery exhibited a high capacity of 274 mAh·g-1 at 0.5 A·g-1,as well as a long cycle life and superior rate performance.Meanwhile,the energy storage mechanism was proved to be a H+and Zn2+co-insertion/extraction process by cyclic voltammetry(CV)and galvanostatic charge-discharge(GCD)tests.
aqueous Zn-ion batteryMnO2F-dopedoxygen vacancycathode material
万方数据
维普
