The flourish of insertion reaction-type V 2 O 3 negative materials with large reversible capacity and outstanding rate performance is facing a huge trouble. In this study, we have successfully prepared a V 2 O 3 @C/rGO composite by adjusting surface tension. The small V 2 O 3 @C nanosheets are fastened to reduced graphene oxide, which remarkably elevates the electron and lithium ion transfer rate. More importantly, the obvious interaction between V 2 O 3 and reduced graphene oxide is beneficial for faster charge transfer. The above features of the V 2 O 3 @C/rGO composite are responsible for obtaining larger reversible capacity and superior rate capability. When applied to lithium-ion batteries as a negative material, it delivers a large reversible discharge capacity of 754 mA h g −1 at the 100th cycle under 100 mA g −1 , although under 2000 mA g −1 , V 2 O 3 @C/rGO still can give a large capacity of 409 mA h g −1 . This study would shed novel light on the preparation of 2D materials and the efficient application of insertion reaction-type materials.
The development of SnO 2 -based negative materials possessing a long cyclic life is troubled by their huge volume change in the Li + insertion and detachment process. In our study, the SnO 2 /Sn/NC composite was successfully prepared by an uncomplicated and controllable route. The ultrasmall SnO 2 /Sn nanoparticles are fixed on the N-doped carbon framework, which prominently alleviate its vast volume variation and improve its electrochemical reaction kinetics. The above-mentioned feature of SnO 2 /Sn/NC endows it with an exceptional cyclic lifespan and good rate capability. When employed as the negative electrode for the Li-ion battery at 1.0 A g −1 , it releases a competent discharge capacity of 344 mAh g −1 at the 995th cycle. New dawn would be brought by the investigation of the synthesis and utilization of Sn-based compounds.
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