Delocalized electronic engineering of TiNb2O7 enables low temperature capability for high-areal-capacity lithium-ion batteries

Yan Zhang, Yingjie Wang, Wei Zhao, Pengjian Zuo, Yujin Tong, Geping Yin (), Tong Zhu () and Shuaifeng Lou ()
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Yan Zhang: Harbin Institute of Technology
Yingjie Wang: Beijing Institute of Technology
Wei Zhao: Harbin Institute of Technology
Pengjian Zuo: Harbin Institute of Technology
Yujin Tong: University of Duisburg-Essen
Geping Yin: Harbin Institute of Technology
Tong Zhu: Beijing Institute of Technology
Shuaifeng Lou: Harbin Institute of Technology

Nature Communications, 2024, vol. 15, issue 1, 1-15

Abstract: Abstract High areal capacity and low-temperature ability are critical for lithium-ion batteries (LIBs). However, the practical operation is seriously impeded by the sluggish rates of mass and charge transfer. Herein, the active electronic states of TiNb2O7 material is modulated by dopant and O-vacancies for enhanced low-temperature dynamics. Femtosecond laser-based transient absorption spectroscopy is employed to depict carrier dynamics of TiNb2O7, which verifies the localized structure polarization accounting for reduced transport overpotential, facilitated electron/ion transport, and improved Li+ adsorption. At high-mass loading of 10 mg cm−2 and −30 °C, TNO-x@N microflowers exhibit stable cycling performance with 92.9% capacity retention over 250 cycles at 1 C (1.0-3.0 V, 1 C = 250 mA g−1). Even at −40 °C, a competitive areal capacity of 1.32 mAh cm−2 can be achieved. Such a fundamental understanding of the intrinsic structure-function put forward a rational viewpoint for designing high-areal-capacity batteries in cold regions.

Date: 2024
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DOI: 10.1038/s41467-024-50455-1

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