共查询到20条相似文献,搜索用时 31 毫秒
1.
Thin films of poly(methyl methacrylate) (PMMA) with lithium triflate (LiCF3SO3) were prepared by using the solution-casting method with PMMA as the host polymer. Ionic conductivity and dielectric measurements
were carried out on these films. The highest conductivity for polymer electrolyte with a ratio of 65:35 was found to be 9.88 × 10−5 S cm−1, which is suitable for the production of mobile phone battery. Thermal gravimetric analysis was carried out to evaluate the
thermal stability of the polymer electrolyte. The addition of salts will increase thermal stability of the polymer electrolyte. 相似文献
2.
In the present study, a kind of solid polymer electrolyte (SPE) based on poly(vinylidene difluoride-co-hexafluoropropylene)/poly(methyl methacrylate) blends was prepared by a casting method to solve the safety problem of lithium
secondary batteries. Owing to being plasticized with a room temperature ionic liquid, N-butyl-N′-methyl-imidiazolium hexafluorophosphate, the obtained SPE shows a thermal decomposition temperature over 300°C and an ionic
conductivity close to 10−3 S cm−1. The SPE-3 sample, in which the weight of two polymers is equivalent, possesses an ionic conductivity of 0.45 × 10−3 S cm−1 at 25°C and presents an electrochemical window of 4.43 V. The ionic conductivity of the SPE-3 is as high as 1.73 × 10−3 S cm−1 at 75°C approaching to that of liquid electrolyte. The electrochemical performances of the Li/LiFePO4 cells confirmed its feasibility in lithium secondary batteries. 相似文献
3.
A novel molten salt electrolyte composed of lithium triflate (CF3SO3Li, LiTf), sodium triflate (CF3SO3Na, NaTf), and potassium triflate (CF3SO3K, KTf) has been prepared and characterized by thermogravimetry/differential thermal analysis (TG/DTA), electrochemical impedance
spectroscopy (EIS), and cyclic voltammetry. TG/DTA shows that the electrolyte was thermally stable when the temperature was
under 400 °C. Its thermal stability gradually decreased with increase of LiTf concentration. The ionic conductivity of molten
salt electrolyte has been evaluated by EIS and its value exceeds 10−2 Scm−1 in the temperature range from 230 to 270 °C. The electrochemical window of the electrolyte at the molar ratio of 0.5/1/1
is about 4.7 V at 250 °C. This electrolyte with low melting point exhibits promising characteristics for high-temperature
lithium batteries. 相似文献
4.
P. Periasamy K. Tatsumi N. Kalaiselvi M. Shikano T. Fiyieda Y. Saito T. Sakai M. Mizukata A. Kajinami S. Deki 《Ionics》2002,8(5-6):453-460
A series of gel polymer electrolytes containing PVdF as homo polymer, a mixture of 1:1 Ethylene Carbonate (EC) : Propylene
Carbonate (PC) as plasticizer and lithium-bistrifluoromethane sulphone imide [imide — LiN (CF3SO2)2] has been developed. Amounts of polymer (PVdF), plasticizer and the imide lithium salt have been varied as a function of
their weight ratio composition in this regard. Dimensionally stable films possessing appreciable room temperature conductivity
values have been obtained with respect to certain weight ratio compositions. However, conductivity data have been recorded
at different possible temperatures, i.e., from 20 °C to 65 °C. XRD and DSC studies were carried out to characterize the polymer
films for better amorphicity and reduced glass transition temperature, respectively. The electrochemical interface stability
of the PVdF based gel polymer electrolytes over a range of storage period (24 h – 10 days) have been investigated using A.C.
impedance studies. Test cells containing Li/gel polymer electrolyte (GPE)/Li have been subjected to undergo 50 charge-discharge
cycles in order to understand the electrochemical performance behaviour of the dimensionally stable films of superior conductivity.
The observed capacity fade of less than 20% even after 50 cycles is in favour of the electrochemical stability of the gel
polymer electrolyte containing 27.5% PVdF −67.5 % EC+PC −5% imide salt. Cyclic voltammetry studies establish the possibility
of a reversible intercalation — deintercalation process involving Li+ ions through the gel polymer electrolyte. 相似文献
5.
Polymer electrolyte membranes, comprising of poly(methyl methacrylate) (PMMA), lithium tetraborate (Li2B4O7) as salt and dibutyl phthalate (DBP) as plasticizer were prepared using a solution casting method. The incorporation of DBP
enhanced the ionic conductivity of the polymer electrolyte. The polymer electrolyte containing 70 wt.% of poly(methyl methacrylate)–lithium
tetraborate and 30 wt.% of DBP presents the highest ionic conductivity of 1.58 × 10−7 S/cm. The temperature dependence of ionic conductivity study showed that these polymer electrolytes obey Vogel–Tamman–Fulcher
(VTF) type behaviour. Thermogravimetric analysis (TGA) was employed to analyse the thermal stability of the polymer electrolytes.
Fourier transform infrared (FTIR) studies confirmed the complexation between poly(methyl methacrylate), lithium tetraborate
and DBP. 相似文献
6.
The blend-based polymer electrolyte consisting of poly (vinyl chloride) (PVC) and poly (ethylene glycol) (PEG) as host polymers
and lithium perchlorate (LiClO4) as the complexing salt was studied. An attempt was made to investigate the effect of TiO2 concentration in the unplasticized PVC–PEG polymer electrolyte system. The XRD and FTIR studies confirm the formation of
a polymer–salt complex. The conductivity results indicate that the incorporation of ceramic filler up to a certain concentration
(15 wt.%) increases the ionic conductivity and upon further addition the conductivity decreases. The maximum ionic conductivity
0.012 × 10−4 S cm−1 is obtained for PVC–PEG–LiClO4–TiO2 (75–25–5–15) system. Thermal stability of the polymer electrolyte is ascertained from TG/DTA studies. 相似文献
7.
Plasticized polymer electrolytes composed of poly(methyl methacrylate) (PMMA) as the host polymer and lithium bis(trifluoromethanesulfonyl)imide
LiN(CF3SO2)2 as a salt were prepared by solution casting technique at different ratios. The ionic conductivity varied slightly and exhibited
a maximum value of 3.65 × 10−5 S cm−1 at 85% PMMA and 15% LiN(CF3SO2)2. The complexation effect of salt was investigated using FTIR. It showed some simple overlapping and shift in peaks between
PMMA and LiN(CF3SO2)2 salt in the polymer electrolyte. Ethylene carbonate (EC) and propylene carbonate (PC) were added to the PMMA–LiN(CF3SO2)2 polymer electrolyte as plasticizer to enhance the conductivity. The highest conductivities obtained were 1.28 × 10−4 S cm−1 and 2.00 × 10−4 S cm−1 for EC and PC mixture system, respectively. In addition, to improve the handling of films, 1% to 5% fumed silica was added
to the PMMA–LiN(CF3SO2)2–EC–PC solid polymer electrolyte which showed a maximum value at 6.11 × 10−5 S cm−1 for 2% SiO2. 相似文献
8.
Hybrid solid polymer electrolyte films comprising of poly(vinyl acetate) (PVAc), poly(methyl methacrylate) (PMMA), LiClO4, and propylene carbonate are prepared by solution casting technique by varying the salt concentration. In this study, PVAc/PMMA
polymer blend ratio is fixed as 25:75 on the basis of conductivity and mechanical stability of the film. X-ray diffraction,
Fourier transform infrared impedance, thermogravimetry/differential thermal analysis and scanning electron microscopy studies
are carried out for the polymer electrolytes. The maximum ionic conductivity is found to be 4.511 × 10−4 S cm−1 at 303 K for the plasticized polymer electrolyte with 8 wt.% of LiClO4. The ionic conductivity is found to decrease with an increase of LiClO4 concentration. 相似文献
9.
J. C. Cruz V. Baglio S. Siracusano R. Ornelas L. Ortiz-Frade L. G. Arriaga V. Antonucci A. S. Aricò 《Journal of nanoparticle research》2011,13(4):1639-1646
Nanosized IrO2 electrocatalysts (d ~ 7–9 nm) with specific surface area up to 100 m2 g−1 were synthesized and characterized for the oxygen evolution reaction in a solid polymer electrolyte (SPE) electrolyzer. The
catalysts were prepared by a colloidal method in aqueous solution and a subsequent thermal treatment. An iridium hydroxide
hydrate precursor was obtained at ~100 °C, which was, successively, calcined at different temperatures from 200 to 500 °C.
The physico-chemical characterization was carried out by X-ray diffraction (XRD), thermogravimetry–differential scanning calorimetry
(TG–DSC) and transmission electron microscopy (TEM). IrO2 catalysts were sprayed onto a Nafion 115 membrane up to a loading of 3 mg cm−2. A Pt catalyst was used at the cathode compartment with a loading of 0.6 mg cm−2. The electrochemical activity for water electrolysis of the membrane-electrode assemblies (MEAs) was investigated in a single
cell SPE electrolyzer by steady-state polarization curves, impedance spectroscopy and chrono-amperometric measurements. A
maximum current density of 1.3 A cm−2 was obtained at 1.8 V and 80 °C for the IrO2 catalyst calcined at 400 °C for 1 h. A stable performance was recorded in single cell for this anode catalyst at 80 °C. The
suitable catalytic activity and stability of the most performing catalyst were interpreted in terms of proper combination
between nanostructure and suitable morphology. 相似文献
10.
A solid polymer electrolyte comprising blend of poly(ethylene oxide) and 50% epoxidized natural rubber (ENR50) as a polymer
host, LiCF3SO3 as a salt and nanoparticle ZnO as an inorganic filler was prepared by solution-casting technique. The effect of filler on
the electrolyte properties was characterized and analysed. FESEM analysis showed that the filler was well distributed in the
polymer matrix, while the effective interaction between the salt and the polymer host was reduced by the addition of filler.
As evidenced by FTIR analysis, which showed the formation of triplet peak at C-O-C stretching region. Ionic conductivity was
found to decrease from 1.4 × 10−4 Scm−1 to 2.5 × 10−6 Scm−1 upon the addition of filler, due to the blocking effect of filler into the electrolyte conduction pathways. The temperature
dependence on the electrolyte conductivity obeys Arrhenius rule in two temperature regions. 相似文献
11.
The systems poly(butadiene-co-acrylonitrile) (PBAN) - lithium salts have been studied by means of X-ray and IR spectroscopy,
optical microscopy and ac- and dc-conductivity measurements. X-ray and microscopy studies have confirmed that PBAN dissolves
LiClO4 up to [CN]/[Li] ≈ 2: 1. IR spectra of the samples with LiAsF6, LiCF3SO3 and LiClO4 have indicated the coordination between Li+ and the polar CN groups of PBAN. So, PBAN was found to be a suitable polymer matrix for SPE. The polymer films exhibited
predominant ionic conductivity. Measurements of conductivity and Li transport numbers versus temperature over a wide range
of salt concentrations revealed the existence of two concentration regions (within the limits of salt solubility) corresponding
to liquid-like and glass-like ion transport mechanisms. New solid polymer electrolyte with lithium single-ion conductivity
of 10−3 S cm−1 at 25 – 95 °C was obtained.
Paper presented at the 4th Euroconference on Solid State Ionics, Renvyle, Galway, Ireland, Sept. 13–19, 1997 相似文献
12.
《Solid State Ionics》2006,177(9-10):843-846
We have synthesized poly(ethylene glycol) (PEG)-aluminate ester as a plasticizer for solid polymer electrolytes. The thermal stability, ionic conductivity and electrochemical stability of the polymer electrolyte which consist of poly(ethylene oxide) (PEO)-based copolymer, PEG–aluminate ester and lithium bis-trifluoromethanesulfonimide (LiTFSI) were investigated. Addition of PEG–aluminate ester increased the ionic conductivity of the polymer electrolyte, showing greater than 10− 4 S cm− 1 at 30 °C. The polymer electrolyte containing PEG–aluminate ester retained thermal stability of the non-additive polymer electrolyte and exhibited electrochemical stability up to 4.5 V vs. Li+/Li at 30 °C. 相似文献
13.
The effect of plasticizer and TiO2 nanoparticles on the conductivity, chemical interaction and surface morphology of polymer electrolyte of MG49–EC–LiClO4–TiO2 has been investigated. The electrolyte films were successfully prepared by solution casting technique. The ceramic filler,
TiO2, was synthesized in situ by sol-gel process and was added into the MG49–EC–LiClO4 electrolyte system. Alternating current electrochemical impedance spectroscopy was employed to investigate the ionic conductivity
of the electrolyte films at 25 °C, and the analysis showed that the addition of TiO2 filler and ethylene carbonate (EC) plasticizer has increased the ionic conductivity of the electrolyte up to its optimum
level. The highest conductivity of 1.1 × 10−3 Scm−1 was obtained at 30 wt.% of EC. Fourier transform infrared spectroscopy measurement was employed to study the interactions
between lithium ions and oxygen atoms that occurred at carbonyl (C=O) and ether (C-O-C) groups. The scanning electron microscopy
micrograph shows that the electrolyte with 30 wt.% EC posses the smoothest surface for which the highest conductivity was
obtained. 相似文献
14.
Li-ion rechargeable batteries based on polymer electrolytes are of great interest for solid state electrochemical devices
nowadays. Many studies have been carried out to improve the ionic conductivity of polymer electrolytes, which include polymer
blending, incorporating plasticizers and filler additives in the electrolyte systems. This paper describes the effects of
incorporating nano-sized MnO2 filler on the ionic conductivity enhancement of a plasticized polymer blend PMMA–PEO–LiClO4–EC electrolyte system. The maximum conductivity achieved is within the range of 10−3 S cm−1 by optimizing the composition of the polymers, salts, plasticizer, and filler. The temperature dependence of the polymer
conductivity obeys the VTF relationship. DSC and XRD studies are carried out to clarify the complex formation between the
polymers, salts, and plasticizer. 相似文献
15.
A nanoparticle TiO2 solid-state photoelectrochemical cell utilizing as a solid electrolyte of poly(acrylonitrile)–propylene–carbonate–lithium
perchlorate (PAN–PC–LiClO4) has been fabricated. The performance of the device has been tested in the dark and under illumination of 100-mW cm−2 light. A nanoparticle TiO2 film was deposited onto indium tin oxide-covered glass substrate by controlled hydrolysis technique assisted with spin-coating
technique. The average grain size for the TiO2 film is 76 nm. LiClO4 salt was used as a redox couple. The room temperature conductivity of the electrolyte is 4.2 × 10−4 S cm−1. A graphite electrode was prepared onto a glass slide by electron beam evaporation technique. The device shows the rectification
property in the dark and shows the photovoltaic effect under illumination. The best J
sc and V
oc of the device were 2.82 μA cm−2 and V
oc of 0.58 V, respectively, obtained at the conductivity of 4.2 × 10−4 S cm−1 and intensity of 100 mW cm−2. The J
sc was improved by about three times by introducing nanoparticle TiO2 and by using a solid electrolyte of PAN–PC–LiClO4 replacing PVC–PC–LiClO4 in the device. The current transport mechanism of the cell is also presented in this paper. 相似文献
16.
Solid polymer electrolytes (SPE) based on poly-(vinyl alcohol) (PVA)0.7 and sodium iodide (NaI)0.3 complexed with sulfuric acid (SA) at different concentrations were prepared using solution casting technique. The structural
properties of these electrolyte films were examined by X-ray diffraction (XRD) studies. The XRD data revealed that sulfuric
acid disrupt the semi-crystalline nature of (PVA)0.7(NaI)0.3 and convert it into an amorphous phase. The proton conductivity and impedance of the electrolyte were studied with changing
sulfuric acid concentration from 0 to 5.1 mol/liter (M). The highest conductivity of (PVA)0.7(NaI)0.3 matrix at room temperature was 10−5 S cm−1 and this increased to 10−3 S cm−1 with doping by 5.1 M sulfuric acid. The electrical conductivity (σ) and dielectric permittivity (ε′) of the solid polymer electrolyte in frequency range (500 Hz–1 MHz) and temperature range (300–400) K were carried out.
The electrolyte with the highest electrical conductivity was used in the fabrication of a sodium battery with the configuration
Na/SPE/MnO2. The fabricated cells give open circuit voltage of 3.34 V and have an internal resistance of 4.5 kΩ. 相似文献
17.
Types I and II solid state redox supercapacitors have been constructed using polypyrrole (pPy) and poly (3-methyl thiophene)
(pMeT) conducting polymer electrodes with lithium ion conducting polymer electrolyte poly(ethylene oxide) (PEO)-LiCF3SO3 plasticised with poly (ethylene glycol) (PEG). The performance of the capacitors has been characterised by a.c. impedance,
linear sweep voltammetry, galvanostatic charge-discharge methods and long term cycling tests. The asymmetric type II capacitors
with p-doped pPy and pMeT electrodes give a capacitance value ∼ 2 mF cm−2 (equivalent to 18 Fg−1 of the total mass of the electrodes) and can be charged up to the voltage of 1.7 V. The symmetric type 1 capacitors of the
configuration pPy | polymer electrolyte | pPy and pMeT | polymer electrolyte | pMeT show comparable values of capacitance
but they are limited to the working voltage of <1.0 V.
Paper presented at the 4th Euroconference on Solid State Ionics, Renvyle, Galway, Ireland, Sept. 13–19, 1997 相似文献
18.
The electrical, structural, and photoelectrochemical properties of the polymer electrolyte PEO:NaI/I2 doped with an ionic liquid 1-ethyl 3-methylimidazolium dicyanamide (EMImDCN) have been reported. Incorporation of the ionic
liquid (IL) increases the membrane homogeneity, decreased surface roughness, and enhances the short current (J
sc). Additionally, the doping of IL provides more charge carriers which enhances overall ionic conductivity (σ). The optimized
σ was found at 40 wt.% IL composition. The fabricated DSSC using this new solid electrolyte showed 1.43% efficiency at 100 mW
cm−2. 相似文献
19.
Hellar Nithya S. Selvasekarapandian P. Christopher Selvin Dorai Arun Kumar Muthusamy Hema 《Ionics》2011,17(7):587-593
The plasticized polymer electrolyte consisting of poly(epichlorohydrin-ethyleneoxide) [P(ECH-EO)], lithium perchlorate (LiClO4) and γ-butyrolactone (γ-BL) have been prepared by simple solution casting technique. The polymer–salt–plasticizer complex
has been confirmed by XRD analysis. The ionic conductivity studies have been carried out using AC impedance technique. The
effect of plasticizer (γ-BL) on ionic conductivity has been discussed with respect to different temperatures. The maximum
value of ionic conductivity is found to be 1.3 × 10−4 Scm−1 for 70P(ECH-EO):15γ-BL:15LiClO4 at 303 K. The temperature dependence of the plasticized polymer electrolyte follows the Vogel–Tamman–Fulcher formalism. The
activation energy is found to decrease with the increase in plasticizer. 相似文献
20.
Dillip K. Pradhan B. K. Samantaray R. N. P. Choudhary N. K. Karan Reji Thomas R. S. Katiyar 《Ionics》2011,17(2):127-134
The solid polymer electrolyte films based on polyethylene oxide, NaClO4 with dodecyl amine modified montmorillonite as filler, and polyethylene glycol as plasticizer were prepared by a tape casting
method. The effect of plasticization on structural, microstructural, and electrical properties of the materials has been investigated.
A systematic change in the structural and microstructural properties of plasticized polymer nanocomposite electrolytes (PPNCEs)
on addition of plasticizer was observed in our X-ray diffraction pattern and scanning electron microscopy micrographs. Complex
impedance analysis technique was used to calculate the electrical properties of the nanocomposites. Addition of plasticizer
has resulted in the lowering of the glass transition temperature, effective dissociation of the salt, and enhancement in the
electrical conductivity. The maximum value of conductivity obtained was ∼4.4 × 10−6 S cm−1 (on addition of ∼20% plasticizer), which is an order of magnitude higher than that of pure polymer nanocomposite electrolyte
films (2.82 × 10−7 S cm−1). The enhancement in conductivity on plasticization was well correlated with the change in other physical properties. 相似文献