A facile strategy to fabricate V2O3/Porous N-doped carbon nanosheet framework as high-performance anode for lithium-ion batteries

Abstract

The development of intercalation-type V2O3 in lithium-ion batteries is greatly hindered by low reversible capacity, poor cycling stability and rate performance. It is believed that fabricating V2O3/3D carbon framework composite will bring about a superior electrochemical performance. Facile synthesis of this composite, however, is a great challenge. In this work, a facile strategy is developed to synthesize V2O3/porous N-doped 3D carbon nanosheet framework composite. The obtained V2O3 nanoparticles are grown in porous N-doped 3D carbon nanosheet framework, which can significantly elevate electrical conductivity, Li+ ion transfer and electrode stability. What's more, the strong chemical interactions between V2O3 and carbon are conducive to accelerate charge transfer. These features of V2O3/porous N-doped 3D carbon nanosheet framework composite are favorable for achieving high reversible capacity and excellent rate performance. When used as the anode for lithium-ion batteries, a high discharge capacity of 436 mA h g−1 is retained at 500 mA g−1 after 200 cycles. Even at 2000 mA g−1, a capacity of 344 mA h g−1 is achieved. This work will bring the new prospects for the synthesis and the potential application of metal oxide/3D carbon framework composite.