Date of Award

August 2015

Degree Type

Thesis

Degree Name

Master of Science

Department

Engineering

First Advisor

Junhong Chen

Committee Members

Junhong Chen, Benjamin Church, Deyang Qu

Keywords

Electrochemistry, Lithium-Ion Batteries, Nanoparticles, Tin Anode, Titanium Oxide Shell

Abstract

Tin, an anode material with a high capacity for lithium-ion batteries, has poor cyclic performance because of the high volume expansion upon lithiation. Based on a literature review of the applications of lithium-ion batteries and current research progress of the tin-based anode materials for lithium-ion batteries, we developed a method to synthesize hollow TiO2 spheres with tin nanoparticles anchored on the inner surface of the TiO2 shell. Such a unique tin/TiO2 composite alleviates the volume change of tin–based anode materials in charge-discharge processes. SnCl2·2H2O (Tin (II) chloride dihydrate) and titanium (IV) isopropoxide (TIPT) were used as the Sn source and the Ti source, respectively, while CaCO3 was used as a template to fabricate the TiO2 hollow shell. A variety of modern material testing methods (XRD, SEM, XPS, Raman, BET, etc.) and electrochemical measurements such as galvanostatic charge-discharge and cyclic voltammetry (CV) testing were employed to systematically study effects of various synthesis parameters on the structure and battery performance of the as-prepared materials. We also discussed the key factors influencing the cycle performance of the composite electrode material and the related mechanism.

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