Abstract
The electrochemical behavior of composite electrodes used in Li ion batteries is influenced by factors such as microstructural characteristics (e.g. particle size, crystallinity, porosity etc.) and composition. For optimal performance of electrodes these factors are of utmost concern and serve as motivation for research in this field. In this report, we investigated LiFePO4 films synthesized by a novel plasma spray deposition method, which has capability for direct deposition of LiFePO4 films with carbon. This enables electrode characterizations to be carried out at the film level, without recourse to steps involving powder material handling. In this report microstructure and electrochemical properties of LiFePO4 films were investigated to elucidate their unique characteristics. Our studies show that factors such as porosity and microstructure of the films affect the electrochemical properties. The mechanical compression and thermal annealing experiments are shown to affect the electrochemical characteristics of LiFePO4 films. We show that annealing treatment leads to a drastic improvement in impedance and charge-discharge capacities for the LiFePO4 films. These treatments could serve to improve the electrode properties of porous film based materials for Li ion batteries and help us develop new film based materials for energy storage applications.
Highlights
Li-ion batteries have proven as promising energy storage devices for electric and hybrid electric vehicle (EV and HEV) applications, due to their high energy and power density
Performance of electrodes based on LiFePO4 film, deposited directly on Al substrates using plasma spray deposition technique has been investigated and we illustrate microstructure and porosity effects on the electrochemical characteristics of LiFePO4 films through the use of techniques such as EIS and cyclic voltammetry (CV)
Rf and Rct for annealed LiFePO4 film are far lower than from as-deposited LiFePO4 films. This indicates that as-deposited LiFePO4 films exhibit sluggish kinetics, and such a behavior could be attributed to poor ionic conductivity of LiFePO4 films
Summary
Li-ion batteries have proven as promising energy storage devices for electric and hybrid electric vehicle (EV and HEV) applications, due to their high energy and power density. The relationship between electrode performance and material microstructure has been intensively investigated for powder based electrodes. The factors such as particle size, porosity, tap density etc. Performance of electrodes based on LiFePO4 film, deposited directly on Al substrates using plasma spray deposition technique has been investigated and we illustrate microstructure and porosity effects on the electrochemical characteristics of LiFePO4 films through the use of techniques such as EIS and cyclic voltammetry (CV). We have investigated the effect of mechanical compression and annealing on the electrochemical properties of LiFePO4 films. Our studies indicate that compression and annealing help to improve electrochemical characteristics of film based LiFePO4 electrodes
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