4.8 Article

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

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CARBON
卷 46, 期 1, 页码 35-40

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PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2007.10.032

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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. (c) 2007 Elsevier Ltd. All rights reserved.

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