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Unlocking Fast and Stable Lithium Insertion in TiNb2O7 via Bi-Induced Lattice Compliance
Kehong Wang1,2,3, Zhuoran Lv1,4, Xun He2
1School of Materials Science and Engineering and Zhangjiang Institute for Advanced Study (ZIAS), Shanghai Jiao Tong University, Shanghai 201203, P. R. China.
ACS Applied Materials & Interfaces
|July 8, 2026
Summary
Bismuth doping improves titanium niobium oxide anodes for safer, high-performance lithium-ion batteries. This doping enhances structural stability and rate capability, overcoming key limitations for advanced battery applications.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Titanium niobium oxide (TiNb2O7 or TNO) is a promising anode material for lithium-ion batteries due to its high capacity and safety.
- Current limitations include poor rate capability and structural instability during lithium insertion.
Purpose of the Study:
- To enhance the rate capability and structural stability of TNO anodes.
- To investigate the effect of bismuth (Bi) doping on TNO's electrochemical performance.
Main Methods:
- Bismuth doping of TNO (Bi0.02-TNO) to modulate electronic structure and metal-oxygen bonding.
- In situ X-ray diffraction to observe lattice evolution during lithiation.
- Electrochemical testing to evaluate specific capacity, rate capability, and cycling stability.
Main Results:
- Bi doping facilitates adaptive charge redistribution, lowering lattice rigidity and deformation energy during lithiation.
- Bi0.02-TNO exhibits a high specific capacity of 270 mAh g-1 at 0.2C.
- Excellent rate capability (145 mAh g-1 at 30C) and long-term stability (130 mAh g-1 after 1250 cycles at 10C) were achieved.
Conclusions:
- Electronic-structure modulation via Bi doping is an effective strategy to reconcile rate capability and structural stability in TNO anodes.
- This approach offers a viable design principle for advanced crystallographic shear oxide anodes.
- Bismuth-doped TNO represents a significant advancement for next-generation safe lithium-ion batteries.
