Abstract
Although TiNb2O7 is regarded as a fast-rechargeable lithium-ion battery (LIB) anode material, the intrinsic poor electrochemical kinetics of TiNb2O7 still dramatically impedes its development. Herein, an ionothermal synthesis-assisted doping strategy is proposed for the preparation of a new W6+-doped TiNb2O7 material (Ti0.95W0.05Nb2O7) with nanoporous structure (denoted as NPTWNO). The improved Li+ diffusion coefficient of NPTWNO suggests that the ionic-liquid-templated nanoporous architecture improves the Li+ diffusion kinetics. The density functional theory computational study reveals that the doped W6+ successfully boosts the electronic conductivity due to the narrowed conduction-valance bandgap resulted from charge redistribution, which is reflected by the electrochemical impedance spectroscopy data. With the simultaneously enhanced Li+ diffusivity and electronic conductivity, NPTWNO achieves fast-rechargeability in LIBs. Therefore, this work indicates the potential of ionothermal synthesis-assisted doping strategy on energy storage materials and offers NPTWNO material with promising electrochemical performance.
Original language | English |
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Article number | e202300101 |
Journal | Batteries and Supercaps |
Volume | 6 |
Issue number | 6 |
DOIs | |
State | Published - Jun 2023 |
Funding
Dr. Runming Tao and Dr. Tianyu Zhang contributed equally. The research at Oak Ridge National Laboratory and the University of Tennessee at Knoxville was supported by the U.S. Department of Energy's Office of Science, Office of Basic Energy Science, Division of Materials Sciences Engineering under contract No. DE‐AC05‐00OR22725. The electron microscopy work was performed at the UT Institute for Advanced Materials and Manufacturing Microscopy Center by Dr. John R. Dunlap. The authors thank Dr. Jiyuan Liang, Dr. Ziyang Lu, Dr. Michael Koehler and Dr. Zhijia Du for their assistance. The U.S. government retains and the publisher, by accepting the article for publication, acknowledges that the U.S. government retains a non‐exclusive, paid‐up, irrevocable, worldwide license to publish or reproduce the published form of the manuscript, or allow other to do so, for U.S. government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe‐public‐access‐plan ).
Funders | Funder number |
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U.S. Department of Energy | |
Office of Science | |
Basic Energy Sciences | |
Oak Ridge National Laboratory | |
University of Tennessee | |
Division of Materials Sciences and Engineering | DE‐AC05‐00OR22725 |
Keywords
- W doping
- fast-rechargeability
- ionic liquid
- lithium-ion batteries
- nanoporous structure