Improving the Electrochemical Performance of Li₂ZnTi₃O₈ by Surface KCl Modification

Inorganic salt of KCl was first employed as an effective modifier to modify Li₂ZnTi₃O₈ anode material via simply mixing in KCl solution followed by sintering at 800 °C in air. The Li₂ZnTi₃O₈ modified with 1.0 wt % KCl exhibited splendid rate capabilities (retaining reversible capacities of 225.6, 195.4, 178.0, 162.4, and 135.6 mAh g^–1 at 100, 200, 400, 800, and 1600 mA g^–1, respectively) and excellent long-term cycling stability (maintaining a capacity of 201.6 mAh g^–1 after 700 cycles). Combining structural characterization with electrochemical analysis, the KCl modification leads to simultaneous doping of K⁺ and Cl^– in Li₂ZnTi₃O₈, contributing to enhance the electronic and ionic conductivities of Li₂ZnTi₃O₈