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

Published online by Cambridge University Press:  11 November 2011

Khadije Bazzi
Affiliation:
Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201
Kulwinder S. Dhindsa
Affiliation:
Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201
Ambesh Dixit
Affiliation:
Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201
Moodakere B. Sahana
Affiliation:
Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201
Chandran Sudakar
Affiliation:
Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201
Mariam Nazri
Affiliation:
Applied Sciences Inc., Cedarville, Ohio 45314
Zhixian Zhou
Affiliation:
Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201
Prem Vaishnava
Affiliation:
Department of Physics, Kettering University, Flint, Michigan 48504
Vaman M. Naik
Affiliation:
Department of Natural Sciences, University of Michigan-Dearborn, Dearborn, Michigan 48128
Gholam A. Nazri
Affiliation:
Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201
Ratna Naik
Affiliation:
Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201
Corresponding
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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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Copyright © Materials Research Society 2011

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