ZrO₂ coated Li_1.9K_0.1ZnTi₃O₈ as an anode material for high-performance lithium-ion batteries

The Li_1.9K_0.1ZnTi₃O₈@ZrO₂ (1 wt%, 3 wt%, and 5 wt%) anode material was synthesized by doping Li₂ZnTi₃O₈ with potassium and coating ZrO₂, where the ZrO₂ coating layer was prepared by citric acid and zirconium acetate, and the potassium source was KCl. When the added ZrO₂ amount is 3%, the material has the most uniform size, reduced polarization, and reduced charge transfer resistance, and the specific capacity of LKZTO@ZrO₂ (3 w%) was 361.5 mA h g^-1 at 200 mA g^-1 at the 100th cycle, which is higher than that of LKZTO, of 311.3 mA h g^-1. The specific capacities of LKZTO@ZrO₂ (3 w%) at 50, 100, 200, 500, and 1000 mA g^-1 after 10 cycles were 424.9, 410.7, 394.1, 337.6 and 270.6 mA h g^-1, indicating that LKZTO@ZrO₂ (3 w%) has excellent electrochemical performance.