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Electrochemical Characteristics of Lithium Iron Phosphate with Multi-Walled Carbon Nanotube for Lithium Polymer Batteries

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Abstract:

In this study, we prepared phospho-olivine LiFePO4 nanoparticles as cathode materials for lithium polymer batteries by hydrothermal reaction at 150 °C. Multi-walled carbon nanotube (MWCNT) was added to enhance the electrical conductivity of LiFePO4. LiFePO4-MWCNT nanoparticles (0 wt%, 1 wt%, 3 wt%, 5 wt%, 7 wt% and 10 wt%) were characterized by X-ray diffraction (XRD) and field emission scanning electron microscope (FE-SEM). LiFePO4-MWCNT/SPE/Li cells were characterized electrochemically by charge/discharge experiments at a constant current density of 0.1 mA cm−2 in a range between 2.5 and 4.3 V versus Li/Li+, cyclic voltammetry (CV) and ac impedance spectroscopy. The results showed that initial discharge capacity of LiFePO4 was 103 mA h g−1. The discharge capacity of LiFePO4-MWCNT/SPE/Li cell with 7 wt% MWCNT was 129 mA h g−1 at the first cycle and 130 mA h g−1 after 30 cycles, respectively. It was demonstrated that cycling performance of LiFePO4-MWCNT/SPE/Li cell with 7 wt% MWCNT was better than that of LiFePO4/SPE/Li cell.

Keywords: LIFEPO4; MULTI-WALLED CARBON NANOTUBE; SOLID STATE ELECTROLYTE

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2008.1167

Publication date: October 1, 2008

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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