The influence of carbon content on the lithium diffusion and electrochemical properties of lithium vanadium phosphate
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The influence of carbon content and porosity of lithium vanadium phosphate, Li3V2(PO4)3, on its diffusion properties and electrochemical performance was examined by GITT and galvanostatic charge/discharge experiments. The diffusion coefficient of Li3V2(PO4)3, as determined by GITT measurements, appears relatively high, thus making this material interesting also for high power application. Moreover, the results of this study clearly show that the porosity and the carbon content of the electrode materials is an important factor affecting the diffusion as well as the electrochemical performance of Li3V2(PO4)3. It was demonstrated that excessive carbon coating may lead to kinetic hindrances but may also contribute specific capacity in anode materials in voltage regions below 1.0 V versus Li/Li+.
KeywordsLithium vanadium phosphate Diffusion coefficient Carbon
The authors wish to thank the University of Muenster, the Ministry of Innovation, Science and Research of North Rhine-Westphalia (MIWF) within the project “Superkondensator und Lithium-Ionen-Hybrid-Superkondensatoren auf der Basis ionischer Flüssigkeiten”.
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