Effect of the degree of porosity on the performance of poly(vinylidene fluoride-trifluoroethylene)/poly(ethylene oxide) blend membranes for lithium-ion battery separators

Gören, Attila; Costa, Carlos M.; Machiavello, M. N. Tamaño; Cíntora-Juárez, Daniel; Nunes-Pereira, J.; Tirado, J.L.; Silva, Maria Manuela; Ribelles, J. L. Gomez; Lanceros‐Méndez, S.

doi:10.1016/j.ssi.2015.08.003

Cited by 35 publications

(27 citation statements)

References 57 publications

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“…Figure depicts cell performance with fibrous membranes and commercial Celgard 2400 membrane as separators at various current densities from 0.2 C to 3 C, respectively. Discharge capacity is decreased with the increasing of current density for all separators, similar to other observations . The commercial Celgard 2400 membranes show inferior C‐rate discharge capacity, as compared to fibrous membranes.…”

Section: Resultssupporting

confidence: 87%

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Poly(vinylidene fluoride)/poly(acrylonitrile) blend fibrous membranes by centrifugal spinning for high‐performance lithium ion battery separators

Zhu

Liu

et al. 2016

J of Applied Polymer Sci

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Fibrous membranes are promising as high-performance lithium ion battery separators because of high porosity and superior electrolyte uptake. Electrospinning is a popular approach to produce fibrous membranes, but its production rate is very low. As a comparison, mass production of fibrous membranes can be achieved by centrifugal spinning. This study reports fibrous membranes based on poly(vinylidene fluoride)/poly(acrylonitrile) blends by centrifugal spinning and their application as lithium ion battery separators. The blend fibrous membranes have high electrolyte uptake of about 300%, excellent dimensional stability at 180 8C and good mechanical strength over 18 MPa. The coin cells with the blend fibrous membranes as separators show high discharge capacity of 147.7 mAh/g at 0.2 C and superior C-rate performance.

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Section: Resultssupporting

confidence: 87%

“…That is, high porosity and electrolyte uptake benefit fast ion transportation through separators, responsible for high ionic conductivity. It could ensure superior charge and discharge performance of assembled lithium ion batteries …”

Section: Resultsmentioning

confidence: 99%

Poly(vinylidene fluoride)/poly(acrylonitrile) blend fibrous membranes by centrifugal spinning for high‐performance lithium ion battery separators

Zhu

Liu

et al. 2016

J of Applied Polymer Sci

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“…As, the electrolyte is an essential component in lithium ion battery as it separates both electrodes (anode and cathode), controls the number of charge carriers and permits their movement during charging/discharging process. Ionically conducting polymer system with polymer as separator/electrolyte are of intense interest due to their multiple applications, including super capacitors, fuel cell, solar cells, electro chromic windows, and Li ion batteries [1][2][3][4] The desirable electrolyte for any application in energy Incorporation of the nanofiller helps in inhibiting the recrystallization of the polymer and decrease the glass transition temperature of the composite polymer electrolyte and hence enhanced conductivity is achieved [27]. The enhancement of ionic conductivity is attributed to Lewis acid-base type interactions of conductive species with the surface group of the nanofiller which decrease the polymer reorganization tendency and modifies the polymer chain arrangement.…”

Section: Introductionmentioning

confidence: 99%

Effect of variation of different nanofillers on structural, electrical, dielectric, and transport properties of blend polymer nanocomposites

Arya

Sadiq

Sharma

2017

Ionics

101

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In the present work, the effect of different nanofiller (BaTiO3, CeO2, Er2O3 or TiO2) on blend solid polymer electrolyte comprising of PEO and PVC complexed with bulky LiPF6 have been explored. The XRD analysis confirms the polymer nanocomposite formation. FTIR provides evidence of interaction among the functional groups of the polymer with the ions and the nanofiller in terms of shifting and changing peak profile. The highest ionic conductivity is ~2.3×10 -5 S cm -1 with a wide electrochemical stability window of ~3.5 V for 10 wt. % Er2O3. The real and imaginary part of dielectric permittivity follows the identical trend of the decreasing value with increase in the frequency. The particle size and the dielectric constant shows an abnormal trend with different nanofiller. The ac conductivity follows the universal power law. An effective mechanism has been proposed to understand the nanofiller interaction with cation coordinated polymer in the investigated system. storage/conversion devices must have (a) high ionic conductivity; (b) electrochemical stability window (>4 V); (c) low melting point; (d) high boiling point; (e) high chemical stability; (f) nontoxicity; (g) low cost and good compatibility with electrodes. Solid polymer electrolyte (SPEs) plays a dual role as an electrolyte as well as a separator which keeps both electrodes separate and avoids the user from using a spacer as in liquid electrolyte system. The first report on ionic conduction was given by P. V. Wright [5] and Fenton et al [6] in 1973 and it was concluded that polymer host dissolved with an alkali metal salt results in an ionic conductive system. The first application of novel polymer electrolyte in batteries was announced by Armand and his co-workers in 1978 [7]. Most devices are based on liquid/gel polymer electrolytes due to their high ionic conductivity (10 -3 -10 -2 Scm -1 ) and compatible with electrodes. But poor mechanical strength, freezing at low temperature, leakage and flammable nature limits their application in commercial use. This motivates the researchers toward better replacement of liquid polymer electrolyte with a solvent free polymer electrolyte having high ionic conductivity, leak proof, flexibility, wide electrochemical window, good mechanical strength, light weight and ease of preparation [8-10]. Solid polymer electrolytes (SPEs) fulfill all above requirements and have attracted researchers globally towards development for their potential application in portable electronics and electrochemical devices [11]. The commonly used host polymer for preparation of polymer nanocomposite films (PNCs) is PEO [12], PAN [13], PMMA [14], PEMA [15] and PVC [16]. Out of aforesaid host polymers, polyethylene oxide (PEO) is undoubtedly the best host polymer used as SPEs with strong, unstrained C-O, C-C, C-H bonds and it has high dielectric constant, easy availability, and high ionic conductivity in amorphous phase, low glass transition temperature, high flexibility, and good dimensional and chemical stability. But PEO possesses low ion...

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“…where σ0 is the conductivity of the pure liquid electrolyte, σeff is the room temperature conductivity of the membrane plus the liquid electrolyte and ε is the degree of porosity of the membrane. Considering this morphology, the evaluation of the degree of porosity is an important parameter affecting the electrochemical properties of the battery separator 43 . Figure 2a) shows the degree of porosity for the different membranes, calculated using equation 3.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

On the Relevance of the Polar β-Phase of Poly(vinylidene fluoride) for High Performance Lithium-Ion Battery Separators

et al. 2017

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Separator membranes based on poly(vinylidene fluoride), PVDF, poly(vinylidene fluoride-co-trifluoroethylene), PVDF-TrFE, poly(vinylidene fluorideco-hexafluropropylene), PVDF-HFP and poly(vinylidene fluoride-cochlorotrifluoroethylene), PVDF-CTFE were prepared by solvent casting method using N,N-dimethylformamide (DMF) as solvent. In all cases, the same polymer/solvent ratio and solvent evaporation temperature were used. For all membranes, porous microstructure is achieved with a degree of porosity larger than 50%. The β-phase content as well as degree of crystallinity were different for each membrane, which were lower for the co-polymer membranes when compared with PVDF. On the other hand, the observed ionic conductivity values, electrolyte uptake, tortuosity and MacMullin number were similar for all membranes. The electrochemical performance of the separator membranes was evaluated in Li/C-LiFePO4 half-cell configuration showing good cyclability and rate capability for all membranes. Among the all separator membranes, PVDF-TrFE demonstrate the best electrochemical performance, with a discharge capacity value of 87 mAh.g-1 after 50 cycles with a capacity retention of 78 % at 2C. Finally, the correlation between the β-phase content in the membranes and the cycling performance was demonstrated (which was significant at high-C rates): larger β-phase contents, leading higher polarity, facilitates faster lithium ion migration within the separator for similar microstructures.

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Effect of the degree of porosity on the performance of poly(vinylidene fluoride-trifluoroethylene)/poly(ethylene oxide) blend membranes for lithium-ion battery separators

Cited by 35 publications

References 57 publications

Poly(vinylidene fluoride)/poly(acrylonitrile) blend fibrous membranes by centrifugal spinning for high‐performance lithium ion battery separators

Poly(vinylidene fluoride)/poly(acrylonitrile) blend fibrous membranes by centrifugal spinning for high‐performance lithium ion battery separators

Effect of variation of different nanofillers on structural, electrical, dielectric, and transport properties of blend polymer nanocomposites

On the Relevance of the Polar β-Phase of Poly(vinylidene fluoride) for High Performance Lithium-Ion Battery Separators

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