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Issue 43, 2013
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The synergy effect on Li storage of LiFePO4 with activated carbon modifications

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Abstract

In this work, composite electrodes containing lithium iron phosphate (LiFePO4) and activated carbon (AC) were prepared by physically mixing LiFePO4 and AC with polyvinylidene fluoride (PVDF) as a binder and acetylene black (AB) as an electrically conductive agent. X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), nitrogen sorption, four-probe conductivity and vibrating densitometer techniques were employed to characterize samples. The characterization results showed that the presence of AC increased the electrical conductivity, reduced the tap density, and modified the porosity of the resultant composite electrode materials. Electrochemical data demonstrated that the composite electrode displayed a significantly improved electrochemical performance in comparison with the pure LiFePO4 electrode. An electrode with 5 wt% AC exhibited specific discharge capacities of 70 mA h g−1 at 20 C and 100 mA h g−1 at 10 C without significant capacity decay after 400 cycles. Galvanostatic charge–discharge and cyclic voltammetry results revealed that energy was stored via both charge adsorption and lithium intercalation/deintercalation owing to the presence of both AC and LiFePO4 in the composite electrode. Electrochemical impedance spectroscopy (EIS) was used to investigate the charge–discharge kinetics and mechanism of the composite electrode. The EIS results demonstrated that the two different active materials (LiFePO4 and AC) displayed synergy in terms of both material structure and energy storage, contributing to the observed excellent electrochemical performance.

Graphical abstract: The synergy effect on Li storage of LiFePO4 with activated carbon modifications

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Publication details

The article was received on 08 Jul 2013, accepted on 14 Aug 2013 and first published on 16 Aug 2013


Article type: Paper
DOI: 10.1039/C3RA44218G
Citation: RSC Adv., 2013,3, 20024-20033
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    The synergy effect on Li storage of LiFePO4 with activated carbon modifications

    B. Wang, Q. Wang, B. Xu, T. Liu, D. Wang and G. Zhao, RSC Adv., 2013, 3, 20024
    DOI: 10.1039/C3RA44218G

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