Highly disordered silicon-containing carbon from polymethylphenylsiloxane as anode material for lithium-ion batteries: Anomalous behavior in thin layer

Abstract

Carbon-enriched glass-like material was produced by pyrolysis of polymethylphenylsiloxane. The physicochemical (examined by X-ray powder diffraction analysis, photoelectron spectroscopy, Raman scattering method, and energy-dispersive X-ray analysis) and electrochemical (examined by galvanostatic/potentiostatic cycling of electrodes in an organic electrolyte) properties of this material make it possible to regard it as a silicon-doped hard carbon. A thin-film electrode made of this material is cardinally different from pasted powder electrodes in the small hysteresis of charge-discharge curves and high reversible and low irreversible capacity with respect to lithium ions.