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Title of Journal: J Appl Electrochem

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Abbravation: Journal of Applied Electrochemistry

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Springer Netherlands

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DOI

10.1016/0022-4731(87)91663-3

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1572-8838

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Preparation and electrochemical properties of sphe

Authors: Zhaolin Liu Xinhui Zhang Liang Hong
Publish Date: 2009/05/21
Volume: 39, Issue: 12, Pages: 2433-
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Abstract

The spherical LiFePO4/C and LiFe09Mg01PO4/C powders were successfully prepared from spherical FePO4 via a simple uniformphase precipitation method at normal pressure using FeCl3 and H3PO4 as the reactants The FePO4 LiFePO4/C and LiFe09Mg01PO4/C powders were characterized by scanning electron microscopies SEM powder Xray diffraction XRD Xray photoelectron spectrometer XPS and tapdensity testing The uniform spherical particles produced are amorphous but they were crystallized to FePO4 after calcining above 400 °C Due to the homogeneity of the basic FePO4 the final products LiFePO4/C and LiFe09Mg01PO4/C are also significantly uniform and the particle size is of about 1 μm in diameter The tapdensity of the spherical LiFePO4/C and LiFe09Mg01PO4/C are 175 and 177 g cm−3 respectively which are remarkably higher than the nonspherical LiFePO4 powders the tapdensity is 10–13 g cm−3 The excellent specific capacities of 148 and 157 mAh g−1 with a rate of 01 C are achieved for the LiFePO4/C and LiFe09Mg01PO4/C respectively Comparison of the cyclic voltammograms of LiFePO4/C and LiFe09Mg01PO4/C shows enhanced redox current and reversibility for the sample substituting Mg on the Fe site LiFe09Mg01PO4/C exhibits better highrate and cycle performances than the unsubstituted LiFePO4/C

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