In-situ XAS Studies on aqueous Zn-Te/Se dual ion battery

Recently, we have developed a new electrochemistry which may greatly enhance energy density in aqueous zinc battery system. To be specific, tellurium or selenium, which are both chalcogen, is used as active material of cathode. At high working voltage, anion storage could be triggered by applying high-concentrated electrolyte. Meanwhile, traditional cation storage could also be used at low working voltage. Impressively, this 6-electron electrochemistry brings high capacity beyond 1000 mAh g-1 which will further enhance performance of aqueous battery. In this proposal, we intend to use in-situ XAS to probe into changes of valence state and coordinate state of our active materials during charging and discharging, thus to understand the mechanism behind. Our studies will provide significant knowledge on electrochemistry of anion storage.