Beschreibung:
Melamine (MA) has some desirable functional groups convertible into solid electrolytes with enhanced ionic conductivity. Herein, a simple hydrothermal method is adopted to modify Li₂ZnTi₃O₈ (LZTO) with MA for optimizing the electrochemical behaviors. After hydrothermally heating at 200 °C for 12 hours, the modified products demonstrate excellent cycle stability, outstanding capacity performance and alleviated polarization. At a mass ratio of 1:0.05 for LZTO to melamine, the product reveals superior Li-ion diffusion, low impedance, and optimal rate performance (denoting capacities of 202.4, 196.3, 182.3, 174.4 and 165.3 mAh g-1 at 0.1, 0.2, 0.4, 0.8 and 1.6 A g-1). Combined the performance with structure and composition, the MA coating layer gradually evolves into solid electrolytes of Li₃N and LiNxOy with high ionic conductivity during lithiation, meanwhile the oxygen vacancies introduced in LZTO accompanied with the occurrence of LiNxOy facilitate electron and ion conductance, thus responsible for the promoted electrochemical performance of LZTO