Interfacial Reactions between Lithium and Grain Boundaries from Anatase TiO2–TUD-1 Electrodes in Lithium-Ion Batteries with Enhanced Capacity Retention

摘要

The synergistic incorporation of anatase TiO_(2) domains into siliceous TUD-1 was optimized in this work and the resulting sample was implemented as the electrode in lithium-ion batteries. Triethanolamine was used as both the templating and complexing agent, the Si/Ti ratio was controlled, and the formation of Ti–O–Si bridges was optimized, as revealed through Fourier transform infrared spectroscopy, with the porous character of the materials being confirmed with N_(2) adsorption–desorption isotherms. The controlled formation of Ti–O–Si bridges resulted in attractive specific charge capacities, high rate capability, and a good retention of capacity. The electrochemical performance of the composite material clearly demonstrates a synergistic effect between pure TiO_(2) in its anatase form and the otherwise inactive siliceous TUD-1 matrix. Specific capacities of 300 mA h g~(–1) with a retention of 94% were obtained at a current density of 0.1 A g~(–1) over 100 cycles. This work showcases the use of bifunctional templating agents in the improvement of the performance and the long-term cyclability of composite electrodes, which can be potentially applied in future synthesis of energy materials.