Nanotube SnO2 cathodes constructed by electrospinning for high-performance hybrid Mg/Li ion batteries-Feasible modification strategy for superior cycle performance

The dynamic characteristics and cycle stability of Mg/Li ion battery (MLIBs) cathodes are keys to develop the electric vehicles. This work proposes a strategy to construct one-dimensional (1D) porous nanomaterials, aiming to ameliorate the overall electrochemical properties of MLIBs. SnO2 cathodes with nano-fiber (NF-SnO2), nano-single tubular (NST-SnO2) and nano-multi-tubular (NMT-SnO2) structures were prepared by electrospinning technic, and the modification mechanism of SnO2 cathodes was discussed. NST-SnO2 and NMT-SnO2 cathodes show excellent cycle and capacity properties than that of NF-SnO2 cathode. The NST-SnO2 and NMT-SnO2 cathodes show discharge capacities of 138.2 and 286.4 mAh g(-1) at 500 mA g(-1) in the first cycle, the capacities after 50 cycles are 156.7 (113.38%) and 206.2 mAh g(-1) (71.99%), which are higher than that of NF-SnO2 cathode 46.7 mAh g(-1) (31.32%). The 69.09 and 118.01 mAh g(-1) of NST-SnO2 and NMT-SnO2 are discharged at 2000 mA g(-1). The electrochemical mechanism of modified nano-SnO2 cathodes in MLIBs is also elaborated. The porosity nanomaterials provide a guarantee for high-performance MLIBs and pave way for the construction of advanced SnO2 cathodes for MLIBs.

Automated summary

A strategy to construct one-dimensional porous nanomaterials was proposed in this study to improve the dynamic characteristics and cycle stability of Mg/Li ion battery (MLIBs) cathodes. SnO2 cathodes with different nanostructures were prepared, and it was found that NST-SnO2 and NMT-SnO2 cathodes showed superior performance compared to NF-SnO2 cathode.