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

Wang, Bo, Wang, Qiuming, Xu, Binghui, Liu, Tiefeng, Wang, Dianlong and Zhao, George (2013) The synergy effect on Li storage of LiFePO4 with activated carbon modifications. RSC Advances, 3 43: 20024-20033. doi:10.1039/c3ra44218g

Author Wang, Bo
Wang, Qiuming
Xu, Binghui
Liu, Tiefeng
Wang, Dianlong
Zhao, George
Title The synergy effect on Li storage of LiFePO4 with activated carbon modifications
Formatted title
The synergy effect on Li storage of LiFePO4 with activated carbon modifications
Journal name RSC Advances   Check publisher's open access policy
ISSN 2046-2069
Publication date 2013-11-01
Year available 2013
Sub-type Article (original research)
DOI 10.1039/c3ra44218g
Open Access Status Not Open Access
Volume 3
Issue 43
Start page 20024
End page 20033
Total pages 10
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Language eng
Formatted 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.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2014 Collection
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