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Electrochemical Properties of LiFePO4/C Composite Improved by High Energy Milling

Journal Materials Science Forum (Volumes 620 - 622)
Volume Eco-Materials Processing and Design X
Edited by Hyungsun Kim, JienFeng Yang, Tohru Sekino and Soo Wohn Lee
Pages 41-44
DOI 10.4028/www.scientific.net/MSF.620-622.41
Citation Chang Sam Kim et al., 2009, Materials Science Forum, 620-622, 41
Online since April, 2009
Authors Chang Sam Kim, Sung Ik Hwang, Shin Woo Kim
Keywords Carbon Coating, Cathode, Electrical Conductivity, High Energy Milling (HEM), LiFePO4/C, Lithium-Ion Battery
Abstract

The electrochemical properties of LiFePO4 as a cathode of lithium ion batteries considerably depend on a particle size of LiFePO4 and a condition of carbon coating. In this study, LiFePO4 powders were prepared using ultrasonic spray pyrolysis method, and then LiFePO4/C composites were made by infiltrating sucrose solution into LiFePO4 powders, drying, high-energy milling and annealing. The effects of high-energy milling were analyzed by comparing with electrochemical properties of powders synthesized without high-energy milling. It was found that the milling process drastically reduced the particle size of synthesized powders and electrical conductivity, and improved discharge capacity, cycle stability and rate performance.

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