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Nanostructured high specific capacity C-LiFePO4 cathode material for lithium-ion batteries

  • Khadije Bazzi (a1), Kulwinder S. Dhindsa (a1), Ambesh Dixit (a1), Moodakere B. Sahana (a1), Chandran Sudakar (a1), Mariam Nazri (a2), Zhixian Zhou (a3), Prem Vaishnava (a4), Vaman M. Naik (a5), Gholam A. Nazri (a6) and Ratna Naik (a6)...

Abstract

We report synthesis of nanosize LiFePO4 and C-LiFePO4 powders with a narrow particle size distribution (20–30 nm) by ethanol-based sol–gel method using lauric acid (LA) as a surfactant for high specific capacity lithium-ion battery cathode material. X-ray diffraction measurements demonstrated that the samples were single-phase materials without any impurity phases. The average crystallite size was found to decrease slightly from 29 nm to approximately 23 nm with carbon coating. The ratio of the Raman D-band (∼1350 cm−1) to G-band (∼1590 cm−1) intensities (ID/IG) and electronic conductivity of these materials show strong dependence on the amount of surfactant coverage. Remarkably, cell prepared with carbon-coated LiFePO4 synthesized using 0.25 M solution of LA showed a very large specific capacity approaching the theoretical limit of 170 mAh/g, in stark contrast to the specific capacity of cell consisting of pure of LiFePO4 (∼75 mAh/g) measured at the same C/2 discharge rate.

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a)Address all correspondence to this author. e-mail: rnaik@wayne.edu

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