A Low-Cost Non-Aqueous Highly Concentrated Salt Zinc Ion Electrolyte
Non-aqueous electrolytes are theoretically compatible with zinc metal cathodes,al-lowing them to maintain high chemical stability and electrochemical reversibility,but current research on this system is limited to low concentration systems.Here,our first study identi-fied a low-cost highly concentrated zinc ion electrolyte of zinc trifluoroacetate and acetonitrile with concentrations up to 15 mol·kg-1.We explored the effect of concentration on the ion solventized structure and electrochemical properties of the electrolyte using this system.In the non-aqueous electrolyte,the concentration increase reduces the compatibility with the zinc cathode and the Coulomb efficiency decreases to 55.35%,but uniform and flat deposi-tion of zinc is achieved at moderate concentrations(5 mol·kg-1).The acetonitrile and CF3COO-anions in the highly concentrated electrolyte are all involved in the solventized structure of Zn2+,forming many aggregated ion pairs.In addition,the low association con-stants of zinc salts were not found to be necessary for high solubility in the study.
zinc trifluoroacetateacetonitrilehighly concentrated electrolytezinc ion batteri
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