Studies on LiFePO4 as cathode material using impedance spectroscopy

被引：344

作者：

Schmidt, Jan Philipp ^{[1
]}

Chrobak, Thorsten ^{[1
]}

Ender, Moses ^{[1
]}

Illig, Joerg ^{[1
]}

Klotz, Dino ^{[1
]}

Ivers-Tiffee, Ellen ^{[1
]}

机构：

[1] Karlsruher Inst Technol, IWE, D-76131 Karlsruhe, Germany

来源：

JOURNAL OF POWER SOURCES | 2011年 / 196卷 / 12期

关键词：

Lithium iron phosphate; Distribution of relaxation times (DRTs); Electrochemical impedance spectroscopy (EIS); RECHARGEABLE LITHIUM BATTERIES; OXIDE FUEL-CELLS; ELECTROCHEMICAL IMPEDANCE; ELECTRODE MATERIALS; DECONVOLUTION; MODEL; INTERCALATION; INTERPHASE; CHEMISTRY; BEHAVIOR;

D O I：

10.1016/j.jpowsour.2010.09.121

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Lithium iron phosphate is a promising cathode material for the use in hybrid electrical vehicles (HEV) meeting the demands of good stability during cycling and safe operation due to reduced risk of thermal runaway. However, slow solid state diffusion and poor electrical conductivity reduce power capability. For further improvement, the identification of the rate determining processes is necessary. Electrochemical impedance spectroscopy (EIS) has proven to be a powerful tool for the characterization of electrochemical systems. In this contribution a deconvolution of the impedance with the distribution of relaxation times (DRTs) is used to obtain a better resolution in frequency domain. Therewith, the relevant loss processes are identified and an impedance model is developed. Using DRT and CNLS-fit allows the determination of time constants and polarization resistances of all relevant loss processes. Furthermore, their temperature behavior is studied and a physical interpretation is provided. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：5342 / 5348

页数：7

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