NMP 2008

	Zhiyong Wang
	ADVISOR:Andreas Stein Chemistry Department University of Minnesota

Porous Carbon/Tin(IV) Oxide Monolith as an Anode for LIthium Ion Batteries

Zhiyong Wang, Melissa A. Fierke and Andreas Stein
Department of Chemistry, University of Minnesota,
207 Pleasant St. S.E., Minneapolis, M
N 55455
*e-mail: stein@chem.umn.edu

A monolithic carbon/tin (IV) oxide (3DOM/m C/SnO2) nanocomposite was prepared and tested as an anode material for lithium ion batteries. A macro-/mesoporous glassy carbon (3DOM/m C) monolith was first synthesized from a triconstituent precursor, using a polymer colloidal crystal and a nonionic surfactant as the templates for macropores and mesopores, respectively. Tin (IV) oxide nanocrystals were then introduced into the mesopores of the carbon monolith via an infiltration-hydrolysis process while maintaining connection between macropores. The novel composite electrode exhibited superior reversible lithium capacity over a carbon/tin dioxide electrode without any designed mesostructure and also over similarly templated glassy carbon electrodes lacking the tin oxide component. The initial discharge capacity was 472 mAh g-1 and remained above 292 mAh g-1 for 100 cycles at 50 mA g-1. The formation of stable SEI layers contributed to the good cycleability of 3DOM/m C/SnO2. The structural and morphological changes of the electrode after cycling were monitored by scanning and transmission electron microscopy and by X-ray diffraction.

 

 

 

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