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Fast-Charge

Advanced Tinb2o7 Anode: Fast-Charging And Long-Cycling Alternative

Enhancing fast-charge and long-cycling in mesoporous Cu2+-doped TiNb2O7 microspheres TiNb2O7 is one of several promising anode materials, but suffers from volumetric change during the charge/discharge process as well as slow ion/electron kinetics. Yang, et al created a 5% Cu2+-doped TiNb2O7 microsphere anode material with a surface coating of N-doped carbon, which demonstrates enhanced specific capacity and cyclic performance. Uniform TiNb2O7 microspheres were quickly synthesized using microwave-based synthesis. To enhance Li+ ion storage, the researchers added Cu2+ and a carbon coating. Cu2+ increased lattice volume and ion/electron conductivity. Density functional theory demonstrated that Cu2+ dopants substitute Ti4+ ions, reducing Li+ diffusion barrier and increasing ionic conductivity. The microspheres were coated with N-doped carbon and maintain a stable capacity of 167.0 mAh g−1 after 2000 cycles at a high rate of 10 C. Optimized Cu2+-doped TiNb2O7 microspheres with N-doped carbon coating exhibit enhanced fast-charging and cycling performance.

Academia | P. 234 Source: C. Yang, D. Ma, J. Yang, M. Manawan, T. Zhao, Y. Feng, J. Li, Z. Liu, Y.-W. Zhang, R. B. Von Dreele, B. H. Toby, C. P. de L. Albarrán, J. H. Pan

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