Bulk Modification of Porous TiNb 2 O 7 Microsphere to Achieve Superior Lithium-Storage Properties at Low Temperature

TiNb O , as a promising alternative of Li Ti O , exhibits giant potential as low-temperature anode due to its higher theoretical capacity and comparable structural stability. However, the sluggish electronic conductivity still remains a challenge. Herein, bulk modification of Cu doping in porous TiN...

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Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2023-11, Vol.19 (47), p.e2303087
Main Authors: Yu, Gengchen, Zhang, Qi, Jing, Jiayi, Wang, Xu, Li, Yifan, Bai, Xue, Li, Tao
Format: Article
Language:English
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Summary:TiNb O , as a promising alternative of Li Ti O , exhibits giant potential as low-temperature anode due to its higher theoretical capacity and comparable structural stability. However, the sluggish electronic conductivity still remains a challenge. Herein, bulk modification of Cu doping in porous TiNb O microsphere is proposed via a simple one-step solvothermal method with subsequent calcination treatment. The results show that the electronic conductivity is improved effectively due to the reduced band gap after doping, while enhanced lithium-ion diffusion is achieved benefiting from the increased interplanar spacing. Therefore, the optimal sample of Cu Ti Nb O exhibits a high reversible capacity of 244.4 mA h g at 100 mA g after 100 cycles, superior rate capability, and long-term cycling stability at 1000 mA g at room temperature. Particularly, it can also display good performance in a wide temperature range from 25 to -30 °C, including a reversible capacity of 76.6 mA h g at -20 °C after 200 cycles at 200 mA g . Moreover, Cu Ti Nb O //LiFePO full cell can deliver a high reversible capacity of 177.5 mA h g at 100 mA g . The excellent electrochemical properties at both ambient and low-temperatures demonstrate the great potential of Cu -doped TiNb O in energy-storage applications.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.202303087