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Substitutional Doping Of TiNb2O7 Anode For Extreme Fast Charging Yu et al. report an ultra-fast charging anode with long-term cycling stability enabled by Fe substitution in single-crystal TiNb2O7
nanostructures. The underlying mechanism by which Fe substitution affects the material’s electronic properties, ionic diffusion kinetics, and structural stability is revealed through combined theoretical modeling and experimental characterization. The optimal Fe3+-doped TNO monocrystalline material (Fe0.05Ti0.95Nb2O6.975) provides a remarkable charge capacity of 238 mAh/g under a 10 C (6 min charging time only) extreme fast-charging protocol (coupled with 1 C discharge), and a capacity of 200 mAh/g at 5 C with a cycling retention of 85% after 1000 cycles. The calculations suggest that Fe3+ substitutional doping leads to a lowering of the band gap coupled with a reduction in the energy barrier for Li+ diffusion.
An ultra-fast charging and long-cycling TiNb2O7 anode was synthesized via DFT-guided Fe3+ substitutional doping Source: F. Yu, etal., “Fe3+-substitutional doping of nanostructured single-crystal TiNb2O7 for long-stable cycling of ultra-fast charging anodes”, Nano Energy 133 (2025) 110494
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