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Graphite‐Based Composite Anodes with C–O–Nb Heterointerfaces Enable Fast Lithium Storage

Von Wiley-VCH zur Verfügung gestellt

To better satisfy the increasing demands for electric vehicles, it's crucial to develop fast-charging lithium-ion batteries. However, the fast-charging capability of commercial graphite anodes is limited by the sluggish Li+ insertion kinetics. Herein, we report a synergistic engineering of uniform nano-sized T-Nb2O5 particles on graphite (Gr@Nb2O5) with C–O–Nb heterointerfaces, which prevents the growth and aggregation of T-Nb2O5 nanoparticles. Through detailed theoretical calculations and pair distribution function analysis, the stable existence of the heterointerfaces is proved, which can accelerate the electron/ion transport. These heterointerfaces endow Gr@Nb2O5 anodes with high ionic conductivity and excellent structural stability. Consequently, Gr@10-Nb2O5 anode exhibits excellent cyclic stability and incredible rate capabilities, with 100.5 mAh g-1 after 10000 stable cycles at an ultrahigh rate of 20 C. In addition, the synergistic Li+ storage mechanism is revealed by systematic electrochemical characterizations and in-situ X-ray diffraction. This work offers new insights to the reasonable design of fast-charging graphite-based anodes for the next generation of LIBs.

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