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Ex situ XAS investigation of effect of binders on electrochemical performance of Li2Fe(SO4)2 cathode
- Source :
- Journal of Materials Chemistry A. 5:19963-19971
- Publication Year :
- 2017
- Publisher :
- Royal Society of Chemistry (RSC), 2017.
-
Abstract
- With the objective of moving towards the commercialisation of Fe-based high voltage cathode Li2Fe(SO4)2, the effect of fluorinated binder (polyvinylidene fluoride – PVDF) and non-fluorinated binder (polyacrylonitrile – PAN) was evaluated. First, the redox mechanism involved in the cycling of Li2Fe(SO4)2 cathode in the presence of these two binders was investigated through ex situ X-ray Absorption Spectroscopy (XAS) studies which can directly determine oxidation state changes of the Fe ion during the charge–discharge process. Subsequently, the effect of the binders on the cycling and rate performance was evaluated. In the present work, consistent cycling performance with discharge capacity of 60 mA h g−1 was recorded at low current rate of C/15. However, it was noted that at high charging rate the cell with binder retained only 29% of the discharge capacity in comparison to the cell without binder. This was attributed to the high charge transfer resistance of binders through cyclic voltammogram and electrochemical impedance spectroscopy studies. This in turn suggests the requirement of high conductivity binders for such sulphate based electrodes.
- Subjects :
- X-ray absorption spectroscopy
Materials science
Renewable Energy, Sustainability and the Environment
Analytical chemistry
Polyacrylonitrile
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
Electrochemistry
01 natural sciences
Polyvinylidene fluoride
Redox
Cathode
0104 chemical sciences
law.invention
Dielectric spectroscopy
chemistry.chemical_compound
chemistry
Chemical engineering
law
Electrode
General Materials Science
0210 nano-technology
Subjects
Details
- ISSN :
- 20507496 and 20507488
- Volume :
- 5
- Database :
- OpenAIRE
- Journal :
- Journal of Materials Chemistry A
- Accession number :
- edsair.doi...........aa833673f9ef553842ad01fced63c08e