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3 years ago

Encapsulated Vanadium-Based Hybrids in Amorphous N-Doped Carbon Matrix as Anode Materials for Lithium-Ion Batteries

Encapsulated Vanadium-Based Hybrids in Amorphous N-Doped Carbon Matrix as Anode Materials for Lithium-Ion Batteries
Shuqin Song, Weitao Qiu, Yexiang Tong, Lei Zhang, Bei Long, Yang Luo, Muhammad-Sadeeq Balogun, Lei Luo
Recently, researchers have made significant advancement in employing transition metal compound hybrids as anode material for lithium-ion batteries and developing simple preparation of these hybrids. To this end, this study reports a facile and scalable method for fabricating a vanadium oxide–nitride composite encapsulated in amorphous carbon matrix by simply mixing ammonium metavanadate and melamine as anode materials for lithium-ion batteries. By tuning the annealing temperature of the mixture, different hybrids of vanadium oxide–nitride compounds are synthesized. The electrode material prepared at 700 °C, i.e., VM-700, exhibits excellent cyclic stability retaining 92% of its reversible capacity after 200 cycles at a current density of 0.5 A g−1 and attractive rate performance (220 mAh g−1) under the current density of up to 2 A g−1. The outstanding electrochemical properties can be attributed to the synergistic effect from heterojunction form by the vanadium compound hybrids, the improved ability of the excellent conductive carbon for electron transfer, and restraining the expansion and aggregation of vanadium oxide–nitride in cycling. These interesting findings will provide a reference for the preparation of transition metal oxide and nitride composites as well. VOx–VN hybrids encapsulated in a carbon matrix are fabricated by a simple and scalable method. The electrode exhibits outstanding electrochemical properties due to the synergistic effect of vanadium compound heterojunction and the ability of carbon matrix to accelerate the electron transfer and buffer the volume expansion in the process of continuous lithiation/delithiation.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/smll.201702081

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