Highly effective Al-doped titanium niobate porous anode material for rechargeable high-rate Li-ion storage performance

Background: Titanium and Niobium-based oxides are served as safety and more stable intercalation type potential anode materials for Li-ion batteries. Methods: In this work, we synthesize pristine titanium niobate (TiNb2O7, as denoted TNO) and novel aluminium doped TNO (Al-TNO) mesoporous materials via a facile solvothermal method for lithium-ion rechargeable batteries anode. The effect of Al-doping into the TNO crystal structure, physico-chemical properties and electrochemical performance are systematically analyzed. Significant findings: The optimized Ti0.95Al0.05Nb2O7 sample exhibits higher Li-ion storage performance. The observed initial specific capacity is 283 mAh g(-1) at 0.1 C and sustains 155 mAh g(-1) after 250 cycles at a current rate of 5 C. Whereas, the pristine TiNb2O7 exhibits initial discharge capacity of 278 mAh g(-1) at 0.1 C and maintains 118 mAh g(-1) after 250 cycles at 5 C. The resultant Al-TNO leads to enhance the conductivity and facilitate the fast Li-ion kinetics behaviours. Therefore, Al-doped TNO electrode cell revealed a higher electrochemical performance than that of pristine TNO electrode. Hence, this work provides an effective manner to improve the high-performance anode materials for Li-ion high-energy storage applications. (C) 2021 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

Automated summary

This study synthesized aluminum-doped titanium niobate mesoporous materials via a solvothermal method and investigated the effects of Al doping on their physicochemical properties and electrochemical performance. The results showed that aluminum doping improved the conductivity and lithium-ion kinetics behavior of the materials, leading to higher storage performance.