PVdF-HFP membrane

The preparation and properties of a novel, commercially viable Li-ion battery based on a gel electrolyte has recently been disclosed by Bellcore (USA) [124]. The technology has, to date, been licensed to six companies and full commercial production is imminent. The polymer membrane is a copolymer based on PVdF copolymerized with hexafluoropropylene (HFP). HFP helps to decrease the crystallinity of the PVdF component, enhancing its ability to absorb liquid. Optimizing the liquid absorption ability, mechanical strength, and processability requires optimized amorphous/crystalline-phase distribution. The PVdF-HFP membrane can absorb plasticizer up to 200 percent of its original volume, especially when a pore former (fumed silica) is added. The liquid electrolyte is typically a solution of LiPF6 in 2 1 ethylene carbonate dimethyl car-... 

Jeschke, S., Mutke, M., Jiang, Z., Alt, B.,WiemhFer, H.D., 2014. Study of carbamate-modified disiloxane in porous PVDF-HFP membranes newelectrolytes/separators for lithium-ion batteries. Chemphyschem 15,1761-1771. 

Flg.8.11 a-d. AFM images of a PVDF porous membrane (a and c, pore dimension 100 nm) and thoseof a dense PVDF-HFP membrane (b and d) before grafting (a and b) and after grafting (c and d). Reprinted from [31]. Copyright 2004, with kind permission from Eisevier... 

V. Aravindan, P. Vickaman, Ind. J. Phys. 2012, 86, 341-344. Effect of aging on the ionic conductivity of polyvinyUdenefluoride-hexafluoropropylene (PVdF-HFP) membrane impregnated with different hthium salts. 

In the last decade, poly(vinylidene fluoride-co-hexafluoropropene) (PVDF-HFP) membranes have also been generated using this new approach, in which supercritical carbon dioxide (SC-CO2) replaces the liquid... 

Cardea S., Gugliuzza A., Sessa M., Aceto M.C., Drioli E., Reverchon E. (2009), Supercritical gel drying a powerful tool for tailoring symmetric porous PVDF-HFP membranes, ACS App/. Mater. Interfaces. 1(1), 171-180. 

ARA 13] Aravindan V., ShubhaN., Cheah Y.L. et al, Extraordinary long-term cycleability of Ti02-B nanorods as anodes in full-cell assembly with electrospun PVdF-HFP membranes , Journal of Materials Chemistry A, vol. 1, no. 2, p. 308, available at http //dx.doi.org/10.1039/c2ta00078d, 2013. 

A few research conducted to fabricate the Electrospun PVDF-HFP membrane by electrospinning process from asolutionofpoly(vinylidenefluoride-cohexafluoropropylene) in a mixture of acetone/N, N-dimethylacetamide to encapsulate electrolyte solution [45, 46], Although the solar eneigy-to electricity conversion efficiency of the quasi-solid-state solar cells with the electrospun PVDF-HFP membrane was slightly lower than the value obtained from the conventional liquid electrolyte solar cells, this cell exhibited better long-term durability because of the prevention of electrolyte solution leakage. 

Priya ARS, Subramania A, Jung Y-S, Kim K-J (2008) High-performance quasi-soUd-state dye-sensitized solar cell based on an electrospun PVdF-HFP membrane electrolyte. Langmuir 24(17) 9816-9819. doi 10.1021/la801375... 

Kumar et al. have observed both the surface and cross-sectional images of PVDF-HFP membranes before and after PSSA grafting and sulfonation (Figure 10.5A and found the original highly porons PVDF-HFP membrane becoming less porous after grafting and almost smooth after snlfonation [32]. 

T. Inan, H. Dogan, A. Giingor, PVdF-HFP membranes for fuel cell applications Effects of doping agents and coating on the membrane s properties. Ionics, 19 (2013) 629-641. 

Fig. 7.3 The cross-section (a, b) and top-view (c, d) field emission scanning electron microscopy (EESEM), and AEM (e, f) images of PVDF-HFP membranes, respectively prepared by phase inversion methods (a, c, e) and electrospinning (b, d, f) methods. Reproduced with permission from Ref. [24] Copyright 2009 Elsevier...

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