Effects of low-temperature carbon encapsulation on the electrochemical performance of SnO2 nanopowders

摘要

Carbon encapsulated SnO2 composites were prepared by a thermal evaporation and decomposition of malic acid(C4H6O5)at low temperature to demonstrate their potential use for application in lithium ion batteries.The solution-based chemical approach was effective for coating amorphous C layers on the surface of SnO2 nanopowders without significant oxygen reduction.The desirable crystalline structure and oxygen stoichiometry of SnO2 were maintained,while amorphous C homogeneously encapsulated SnO2 nanopowders.The strong enhancement on the anodic reversible capacity and cyclic performance was discussed for the C-encapsulated SnO2 composites.It is expected that the low-temperature processing can be a new general route for preparing composites with C from economic point of view.