Studies on LiFePO4 as Cathode Material in Li-Ion Batteries

被引：30

作者：

Illig, J. ^{[1
]}

Chrobak, T. ^{[1
]}

Ender, M. ^{[1
]}

Schmidt, J. P. ^{[1
]}

Klotz, D. ^{[1
]}

Ivers-Tiffee, E. ^{[1
]}

机构：

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

来源：

BATTERIES AND ENERGY TECHNOLOGY (GENERAL) - 217TH ECS MEETING | 2010年 / 28卷 / 30期

关键词：

RECHARGEABLE LITHIUM BATTERIES; OXIDE FUEL-CELLS; ELECTROCHEMICAL IMPEDANCE; ELECTRODE MATERIALS; DEFECT CHEMISTRY; RATE PERFORMANCE; MODEL; DECONVOLUTION; CONDUCTIVITY; SPECTROSCOPY;

D O I：

10.1149/1.3505456

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Lithium iron phosphate is a promising cathode material for the use in lithium-ion batteries 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 (DRT) is used to obtain a better resolution in frequency domain. Therewith, the cathodic and anodic polarization processes are identified and an impedance model for the cell is proposed.

引用

页码：3 / 17

页数：15

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