Rapid Synthesis of Fast-Charging TiNb2O7 for Lithium-Ion Storage via Ultrafast Carbothermal Shock

Year: 2025

Type: article

Abstract: The development of fast-charging lithium-ion batteries urgently requires high-performance anode materials. In this paper, through an ultrafast carbothermal shock (CTS) strategy, titanium niobium oxide (TiNb2O7, TNO) with an optimized structure was successfully synthesized within 30 s. By regulating the synthesis temperature to 1200 °C, the TNO-1200 material was obtained. Its lattice parameters (a-axis: 17.6869 Å) and unit-cell volume (796.83 Å3) were significantly expanded compared to the standard structure (a-axis: 17.51 Å, volume ~790 Å3), which widened the lithium-ion migration channels. Rietveld refinement and atomic position analysis indicated that the partial overlap of Ti/Nb atoms and the cooperative displacement of oxygen atoms induced by CTS reduced the lithium-ion diffusion energy barrier. Meanwhile, the cation disorder suppressed the polarization effect. Electrochemical tests showed that after 3000 cycles at a current density of 10 C, the specific capacity of TNO-1200 reached 125 mAh/g, with a capacity retention rate of 98%. EDS mapping confirmed the uniform distribution of elements and the absence of impurity phases. This study provides an efficient synthesis strategy and theoretical basis for the design of high-performance fast-charging battery materials through atomic-scale structural engineering.

Source: Micromachines

DOI: 10.3390/mi16050490

Authors: Xianyu Hu, Yunlei Zhong, Xiaosai Hu, Xiyuan Feng, Fengying Ye

Institutions: Fudan University, Yancheng Institute of Technology, State Key Laboratory of ASIC and System, Chinese Academy of Sciences, Suzhou Institute of Nano-tech and Nano-bionics, Northwestern Polytechnical University

Language: English

Topic: Advancements in Battery Materials

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: gold

Estimated APC paid: $2,534

Funders: National Natural Science Foundation of China, Ministry of Education of the People's Republic of China, Chinese Academy of Sciences, China Postdoctoral Science Foundation, Government of Jiangsu Province, Natural Science Foundation of Jiangsu Province, Suzhou Institute of Nanotechnology, Chinese Academy of Sciences, Fundamental Research Funds for the Central Universities

OpenAlex ID: W4409688155