Facile Synthesis of quantum dots SnO2/Fe3O4 hybrid composites for superior reversible lithium-ion storage

Abstract

Quantum dots SnO2/Fe3O4 hybrid composites were synthesized by galvanic replacement reaction between Fe3+ ions and Sn and were utilized as anodes for lithium-ion batteries. The composites at few-nanometer scale showed different compositions of SnO2 and Fe3O4 with different reaction time. The composites exhibited significantly enhanced electrochemical performance; for instance, SnO2/Fe3O4-18 h electrode delivered a reversible capacity of 1300 mAh g(-1) after 100 cycles and a rate capacity of 507 mAhg(-1) at 10 Ag-1. The notable performance was ascribed to the presence of quantum dots nanostructures and inactive phases and to the generation of a short Li+-ion diffusion pathway. (C) 2019 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.