La Doping Towards Mesoporous Microsphere-TiNb2O7 as Lithium-ion Battery Anode with High Durability at Low Temperature

doi:10.1007/s40242-025-5121-x

Chemical Research in Chinese Universities ›› 2026, Vol. 42 ›› Issue (1): 323-333.doi: 10.1007/s40242-025-5121-x

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La Doping Towards Mesoporous Microsphere-TiNb₂O₇ as Lithium-ion Battery Anode with High Durability at Low Temperature

TANG Luxuan^1,2, DONG Enjie², WU Guolong², HU Bo², FENG Bo², WU Lina², ZHAO Hongyu², FANG Wei^2,3, CHE Guangbo^1,2,3

1. College of Safety Science and Engineering, Liaoning Technical University, Huludao 125105, P. R. China;
2. College of Chemistry, Baicheng Normal University, Baicheng 137000, P. R. China;
3. Jilin Provincial Key Laboratory of Western Jilin's Clean Energy, Baicheng Normal University, Baicheng 137000, P. R. China

Received:2025-06-04 Online:2026-02-01 Published:2026-01-28
Contact: FANG Wei,E-mail:fangwei@bcnu.edu.cn;CHE Guangbo,E-mail:guangboche@jlnu.edu.cn E-mail:fangwei@bcnu.edu.cn;guangboche@jlnu.edu.cn
Supported by:
This work was supported by the Project of the Jilin Provincial Development and Reform Commission, China (No. 2023C034-1), the Project of the Jilin Provincial Key Laboratory of Western Jilin’s Clean Energy, China (No. YDZJ202502CXJD010), the Jilin Provincial Department of Education Project, China (No. JJKH20230017KJ), the Natural Science Foundation of Jilin Province, China [Free Exploration Key Project (Stable Support Project)] (No. YDZJ202401374ZYTS).

Abstract

Abstract: Improving the electronic and ionic dynamics of TiNb₂O₇ (TNO) is crucial for enhancing its electrochemical properties, low-temperature performance to expand its application areas. In this paper, La_0.015-TNO mesoporous microspheres are obtained by a simple solvent-thermal method. X-Ray diffraction and high-resolution transmission electron microscopy analyses show that La doping effectively amplifies the local lattice spacing of TNO, which endows it with a high electron transport rate and an improved Li⁺ diffusion coefficient. Density functional theory calculations indicate that the excellent performance depends on the narrowing of the band gap as well as the lowering of the ionic diffusion energy barrier. The La_0.015-TNO exhibits excellent rate capabilities and durability, achieving up to 2000 cycles with a potential drop of only 0.0098% per cycle at a rate of 20 C (1 C=387.6 mA/g). A reversible capacity of 135.3 mA·h·g^-1 is attained at -35 ℃ under 0.2 C, and 110.6 mA·h·g^-1 is retained after 1100 cycles at -30 ℃ under 2 C without obvious decay. In addition, the full cell exhibits superior electrochemical performance using commercial lithium iron phosphate as the cathode, delivering 226.3 mA·h·g^-1 under 0.2 C in the first discharge.

Key words: La_0.015-TNO, Mesoporous microsphere, High-rate cycling stability, Low-temperature durability

TANG Luxuan, DONG Enjie, WU Guolong, HU Bo, FENG Bo, WU Lina, ZHAO Hongyu, FANG Wei, CHE Guangbo. La Doping Towards Mesoporous Microsphere-TiNb₂O₇ as Lithium-ion Battery Anode with High Durability at Low Temperature[J]. Chemical Research in Chinese Universities, 2026, 42(1): 323-333.

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La Doping Towards Mesoporous Microsphere-TiNb₂O₇ as Lithium-ion Battery Anode with High Durability at Low Temperature

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