A novel polymer composite as cathode binder of lithium ion batteries with improved rate capability and cyclic stability

In this work, we have developed a novel polymer composite (MPVDF) by embedding maleic anhydride-grated-polyvinylidene fluoride (MA-g-PVDF) into polyvinylidene fluoride (PVDF) as binder of LiCoO2 cathode for lithium ion battery. The cathodes using MPVDF and PVDF as binder have been comparatively inve...

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Bibliographic Details
Published in:Journal of power sources 2014-09, Vol.261, p.170-174
Main Authors: Fu, Z., Feng, H.L., Xiang, X.D., Rao, M.M., Wu, W., Luo, J.C., Chen, T.T., Hu, Q.P., Feng, A.B., Li, W.S.
Format: Article
Language:English
Subjects:
Applied sciences
Binder
Binders
Cathode
Cathodes
Direct energy conversion and energy accumulation
Electric batteries
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Electrolytes
Exact sciences and technology
Lithium batteries
Lithium ion battery
Lithium-ion batteries
Maleic anhydride-grated-polyvinylidene fluoride
Materials
Polymer matrix composites
Polyvinylidene fluorides
Scanning electron microscopy
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Summary:In this work, we have developed a novel polymer composite (MPVDF) by embedding maleic anhydride-grated-polyvinylidene fluoride (MA-g-PVDF) into polyvinylidene fluoride (PVDF) as binder of LiCoO2 cathode for lithium ion battery. The cathodes using MPVDF and PVDF as binder have been comparatively investigated with scanning electron microscope (SEM), X-ray diffraction (XRD) and electrochemical measurements. By using MPVDF as the binder for preparing LiCoO2 cathode, the rate capability and cyclic stability of the LiCoO2 cathode in LiCoO2/Artificial graphite battery are improved significantly. Compared to the cathode using PVDF alone, the discharge capacity of the battery increases by 38.5% at 2 C and the capacity retention of the battery is improved from 84.5% to 90.2% after 300 cycles at 0.5 C when the mass ratio of MA-g-PVDF to PVDF in MPVDF binder is 1:4. The improved performance is attributed to the low crystallinity of MPVDF, which allows larger electrolyte uptake. The electrolyte uptake is 43.5% for the LiCoO2 cathode using MPVDF but only 25.3% for the cathode using PVDF alone. •Composite of MA-g-PVDF with PVDF was developed as binder for LiCoO2 cathode of lithium ion battery.•Composite exhibits lower crystallinity than PVDF and increases electrolyte uptake of cathode.•Application of composite improves significantly rate capability and cyclic stability of battery.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2014.03.087