Electrochemical performance of LiFe0.99La0.01PO 4 coated with different organic acids

George Ting Kuo Fey, Bo Fu Chang, Kai Pin Huang, Yi Chuan Lin, Yung Da Cho, Hsien Ming Kao, Shih Hung Chan

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Olivine-type LiFePO4 is one of the most popular cathode materials for high power Li-ion batteries. However, its intrinsic properties of poor conductivity and low lithium-ion diffusion limit its practical applications. In order to improve these disadvantages, we prepared the LiFe 0.99La0.01PO4/C composite materials by a solid state reaction method using La-ion as a metal dopant and organic diacids as carbon coating sources. In this work, the composite materials were characterized by XRD, DSC, SEM/mapping, TEM/EDS/SAED, and total organic carbon (TOC). Further, their electrochemical performance was examined. The conductivity results of the doped composites showed a distinct enhancement from 3.97×10-8 to 2.60×10-5 S cm-1. The LiFe0.99La0.01PO4/C composites using malonic and sebasic acids as carbon sources displayed an initial discharge capacity of 151 and 145 mAh g-1, respectively, between 2.8 and 4.0 V at a 0.2 C rate. This is a significant improvement compared to the initial discharge capacity of 100 mAh g-1 of the un-doped bare LiFePO4 sample, and it may be related to electronic conductivity enhancement by carbon coating and charge transfer kinetics improvement by La-ion doping.

Original languageEnglish
Title of host publication26th Electric Vehicle Symposium 2012
Pages119-129
Number of pages11
StatePublished - 2012
Event26th Electric Vehicle Symposium 2012 - Los Angeles, CA, United States
Duration: 6 May 20129 May 2012

Publication series

Name26th Electric Vehicle Symposium 2012
Volume1

Conference

Conference26th Electric Vehicle Symposium 2012
Country/TerritoryUnited States
CityLos Angeles, CA
Period6/05/129/05/12

Keywords

  • Battery charge
  • Energy storage
  • Lithium battery

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