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Licensed Unlicensed Requires Authentication Published by De Gruyter (O) November 2, 2011

A Modified Solid State Synthesis of LiFePO4/C as Active Material for Lithium-ion Batteries

Dennis Schünemann, Thorsten Langer, Michael Binnewies and Rainer Pöttgen

Abstract

Solid state chemistry is already established as a conventional procedure for obtaining well-crystallized particles of LiFePO4 with ordered structure. The disadvantages of this method still are the uncontrollable particle growth and agglomeration, long reaction time and moreover the cost of production. The advantages of using 1-Hexadecanol as an additive to create a reducing atmosphere and additionally as a carbon source for the solid state method the existence of iron in the oxidation state Fe3+ can be prevented. The carbon coating can be controlled by the amount of the additive and the reaction conditions such as reaction time or reaction temperature. This modified synthesis cannot reduce the cost of energy but represents a simple variant to obtain both carbon coated LiFePO4 with a specific conductivity up to 10-2 S cm-1 and pure LiFePO4. The latter does not show any impurities as confirmed by Mös sbauer spectroscopy. The reaction time only takes three hours without any time-consuming preparations.


* Correspondence address: Leibniz University of Hanover, Institute of Inorganic Chemistry, Callinstraße 9, 30167 Hannover, Deutschland,

Published Online: 2011-11-2
Published in Print: 2012-2-1

© by Oldenbourg Wissenschaftsverlag, Hannover, Germany

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