共查询到14条相似文献,搜索用时 0 毫秒
1.
Y.H. LiaoX.P. Li C.H. FuR. Xu L. ZhouC.L. Tan S.J. Hu W.S. Li 《Journal of power sources》2011,196(4):2115-2121
A new gel polymer electrolyte (GPE) is reported in this paper. In this GPE, blending polymer of poly(ethylene oxide) (PEO) with poly(vinylidene fluoride-hexafluoropropylene) (P(VdF-HFP)), doped with nano-Al2O3 and supported by polypropylene (PP), is used as polymer matrix, namely PEO-P(VdF-HFP)-Al2O3/PP. The performances of the PEO-P(VdF-HFP)-Al2O3/PP membrane and the corresponding GPE are characterized with mechanical test, CA, EIS, TGA and charge-discharge test. It is found that the performances of the membrane and the GPE depend to a great extent on the content of doped nano-Al2O3. With doping 10 wt.% nano-Al2O3 in PEO-P(VdF-HFP), the mechanical strength from 9.3 MPa to 14.3 MPa, the porosity of the membrane increases from 42% to 49%, the electrolyte uptake from 176% to 273%, the thermal decomposition temperature from 225 °C to 355 °C, and the ionic conductivity of corresponding GPE is improved from 2.7 × 10−3 S cm−1 to 3.8 × 10−3 S cm−1. The lithium ion battery using this GPE exhibits good rate and cycle performances. 相似文献
2.
Metal oxide nanostructures hold enormous potential for electrochemical applications. While thin films of polymer-modified metal oxide electrodes have been widely investigated, there have been a few studies on polymer-modified nanopowders. We report the synthesis of pure molybdenum trioxide (MoO3), pristine and aged nanobelts using hydrothermal method with poly(ethylene glycol) (PEG). Scanning electron microscope (SEM) images reveal the nanobelts to have dimensions of 1–5 μm in length and 100–600 nm in diameter. The electrochemical measurements show that PEG-used aged MoO3 nanobelts have higher specific charge capacity than the PEG-free MoO3 and PEG-used pristine MoO3 nanobelts. 相似文献
3.
4.
Zhang Lan Jihuai Wu Dongbo Wang Sancun Hao Jianming Lin Yunfang Huang 《Solar Energy》2006,80(11):1483-1488
Gel polymer electrolyte based on poly(acrylonitrile-co-styrene)/NaI+I2 and binary solvent mixture was prepared. When the system contains 0.5 M NaI and 0.05 M I2, the maximum ionic conductivity (at 30 °C) of 2.37 mS cm−1 was achieved. Based on a gel polymer electrolyte with 0.5 M NaI, 0.05 M I2 and 0.5 M 4-tert-butylpyridine, a quasi-solid state dye-sensitized solar cell was fabricated and its overall energy conversion efficiency of light-to-electricity of 2.75% was achieved under irradiation of 60 mW cm−2. 相似文献
5.
K. Hanai K. Kusagawa M. Ueno T. Kobayashi N. Imanishi A. Hirano Y. Takeda O. Yamamoto 《Journal of power sources》2010,195(9):2956-6761
The interface resistance between LixFePO4 and poly(ethylene oxide) (PEO)-Li(CF3SO2)2N (LiTFSI) was examined by AC impedance measurement of a LixFePO4/PEO-LiTFSI/LixFePO4 cell in the temperature range of 30-60 °C. Four types of resistance, R0, R1, R2 and R3 were proposed according to analysis of the cell impedance using an equivalent circuit. The sum of R0 and R1 in the high frequency range is consistent with the resistance of the PEO electrolyte. R2 in the middle frequency range is related to lithium ion transport to an active point for charge transfer inside the composite electrode, and R3 in the low frequency range is considered to be the charge transfer resistance. The activation energy for R2 was affected by the thickness and composition of the electrode, whereas that for R3 was not. 相似文献
6.
Yuki KusachiJian Dong Zhengcheng Zhang Khalil Amine 《Journal of power sources》2011,196(20):8301-8306
Silane-based electrolyte is a promising candidate for safer electrochemical energy storage devices because it is thermally and electrochemical stable, less flammable and environmental benign. In this paper, electrochemical properties of one of the silane-based electrolytes, tri(ethylene glycol)-substituted trimethylsilane (1NM3)-lithium bis(oxalate)borate (LiBOB) was studied using LiMn2O4 as cathode and MAG graphite as anode. When combined with LiBOB as lithium salt, the 1NM3-LiBOB electrolyte can provide solid electrolyte interface (SEI) formation due to the reductive decomposition of LiBOB at first charging cycle. Compared to the electrolyte used in the conventional lithium-ion batteries, 1NM3-LiBOB electrolyte showed compatible battery performance in LiMn2O4/MAG chemistry. The AC impedance measurement indicates that the activation energy (Ea) obtained from the charge transfer impedance for 1NM3-LiBOB was higher than that of the state-of-the-art electrolyte. Due to its low conductivity, the rate capability of 1NM3-LiBOB electrolyte needs to be improved. 相似文献
7.
Ding ZhangHui Yan Zhi ZhuHuan Zhang Jian WangQilu 《Journal of power sources》2011,196(23):10120-10125
The electrochemical stability of lithium bis(oxatlato) borate (LiBOB) containing solid polymer electrolyte has been evaluated both by inert electrode and real cathodes. Enhanced intrinsic anodic stability and decreased interface impedance, are obtained by addition of nano-sized MgO to PEO20-LiBOB. It is also found that the LiBOB-containing SPEs exhibit prominent kinetic stability between 3.0 and 4.5 V. For cells using SPEs as the separators, good cycling performance is obtained for real 4 V class cathodes material LiNi1/3Co1/3Mn1/3O2 and LiCoO2. The Li|PEO20-LiBOB|LiNi1/3Co1/3Mn1/3O2 cell takes an initial capacity of 156.8 mAh g−1, with retention of 142.5 mAh g−1 after 20 cycles at 0.2C-rate. The cell also works well up to 1C-rate. The addition of nano-sized MgO into PEO20-LiBOB readily reduces the irreversible capacity per cycle, both for LiNi1/3Co1/3Mn1/3O2 and LiCoO2 cathodes. In addition, the critical role of LiBOB in obtaining kinetic stability and passivating ability towards cathodes are specially discussed. 相似文献
8.
Cheol-Wan Park Ho-Suk Ryu Ki-Won Kim Jou-Hyeon Ahn Jai-Young Lee Hyo-Jun Ahn 《Journal of power sources》2007
An all-solid sodium/sulfur battery using poly (ethylene oxide) (PEO) polymer electrolyte are prepared and tested at 90 °C. Each battery is composed of a solid sulfur electrode, a sodium metal electrode, and a solid PEO polymer electrolyte. During the first discharge, the battery shows plateau potentials at 2.27 and at 1.76 V. The first discharge capacity is 505 mAh g−1 sulfur at 90 °C. The capacity drastically decreases by repeated on charge–discharge cycling but remains at 166 mAh g−1 sulfur after 10 cycles. The latter value is higher than that reported for a Na/poly (vinylidene difluoride)/S battery at room temperature. 相似文献
9.
Hamide Ayd?nMehmet ?enel Hamit ErdemiAbdülhadi Baykal Metin TülüAli Ata Ayhan Bozkurt 《Journal of power sources》2011,196(3):1425-1432
In this study, poly(vinyl alcohol) (PVA) was modified with poly(ethylene glycol) monomethyl ether (PEGME) using borane-tetrahydrofuran (BH3/THF) complex. Molecular weights of both PVA and PEGME were varied prior to reaction. Boron containing comb-branched copolymers were produced and abbreviated as PVA1PEGMEX and PVA2PEGMEX. Then polymer electrolytes were successfully prepared by doping of the host matrix with CF3SO3Li at several stoichiomeric ratios with respect to EO to Li. The materials were characterized via nuclear magnetic resonance (1H NMR and 11B NMR), Fourier transform infrared spectroscopy (FT-IR), Thermogravimetry (TG) and differential scanning calorimeter (DSC). The ionic conductivity of these novel polymer electrolytes were studied by dielectric-impedance spectroscopy. Li-ion conductivity of these polymer electrolytes depends on the length of the side units as well as the doping ratio. Such electrolytes possess satisfactory ambient temperature ionic conductivity (>10−4 S cm−1). Cyclic voltammetry results illustrated that the electrochemical stability domain extends over 4 V. 相似文献
10.
Jialun Li Lin Zhu Jianing Xu Maoxiang Jing Shanshan Yao Xiangqian Shen Songjun Li Feiyue Tu 《国际能源研究杂志》2020,44(9):7831-7840
To seek a solid polymer electrolyte (SPE) with excellent performance, a novel poly(ethylene oxide) (PEO) based SPE is prepared by blending an appropriate amount of microcrystalline poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) with PEO using a universal solution casting method. Field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and differential scanning calorimetry (DSC) are utilized to analyse the samples. The crystallinity of the blend solid polymer electrolyte is significantly lower than that of the neat PEO-based SPE. The addition of the PVDF-HFP disrupts the segment structure of the PEO crystal region and increases the proportion of the amorphous region, thus boosting the migration of lithium ions. The results show that the electrochemical stability window of the blend solid polymer electrolyte reaches as high as 4.8 V. The initial discharge specific capacity of the solid-state LiFePO4/SPE/Li battery is 131 mAh g−1 at 0.5 C and 60°C, and the discharge specific capacity is still 110.5 mAh g−1 after 100 cycles. On the basis of the results, the novel SPE has a widespread application prospects in solid-state lithium-ion batteries. 相似文献
11.
Na WuQi Cao Xianyou WangSheng Li Xiaoyun LiHuayang Deng 《Journal of power sources》2011,196(22):9751-9756
Gel polymer electrolyte films based on thermoplastic polyurethane (TPU)/poly(vinylidene fluoride) (PVdF) with and without in situ ceramic fillers (SiO2 and TiO2) are prepared by electrospinning 9 wt% polymer solution at room temperature. The electrospun TPU-PVdF blending membrane with 3% in situ TiO2 shows a highest ionic conductivity of 4.8 × 10−3 S cm−1 with electrochemical stability up to 5.4 V versus Li+/Li at room temperature and has a high tensile strength (8.7 ± 0.3 MPa) and % elongation at break (110.3 ± 0.2). With the superior electrochemical and mechanical performance, it is very suitable for application in polymer lithium ion batteries. 相似文献
12.
Mosissa Adi Teketel Yohannes Theodros Solomon 《Solar Energy Materials & Solar Cells》2004,83(2-3):301
The photoelectrochemical properties of a solid-state photoelectrochemical cell (PEC) based on poly(3-hexylthiophene), P3HT, and an ion-conducting polymer electrolyte, amorphous poly(ethylene oxide), POMOE, complexed with I3−/I− redox couple has been constructed and studied. The current–voltage characteristics in the dark and under white light illumination, transient photocurrent and photovoltage studies, photocurrent action spectra for front and back side illuminations and an open-circuit voltage and short-circuit current dependence on light intensity have been studied. An open-circuit voltage of 130 mV and a short-circuit current of 0.47 μA cm−2 were obtained at light intensity of 100 mW/cm2. IPCE% of 0.024% for front side illumination (ITO/PEDOT) and IPCE% of 0.003% for backside illumination (ITO/P3HT) were obtained. 相似文献
13.
S. Liu H. WangN. Imanishi T. ZhangA. Hirano Y. TakedaO. Yamamoto J. Yang 《Journal of power sources》2011,196(18):7681-7686
Lithium metal dendrite growth in Li/poly (ethylene oxide)-lithium bis (trifluoromethanesulfonyl) imide (PEO18LiTFSI), nano-silica, and N-methyl-N-propylpiperidinium bis(trifluoromethanesulfonyl)imide (PP13TFSI) composite solid polymer electrolyte/Li was investigated by direct in situ observation. The dendrite onset time decreased with increasing current density and deviated from Sand's law in the current density range of 0.1-0.5 mA cm−2 at 60 °C. Lithium dendrite formation was not observed until 46 h of polarization at 0.5 mA cm−2 and 60 °C, which is a significant improvement compared to that observed in Li/(PEO18LiTFSI)/Li, where the dendrite formation was observed after 15 h polarization at 0.5 mA cm−2 and 60 °C. The suppression of dendrite formation could be explained by the electrical conductivity enhancement and decrease of the interface resistance between Li and the polymer electrolyte by the introduction of both nano-SiO2 and PP13TFSI into PEO18LiTFSI. The electrical conductivity of 4.96 × 10−4 S cm−1 at 60 °C was enhanced to 7.6 × 10−4 S cm−1, and the interface resistance of Li/PEO18LiTFSI/Li of 248 Ω cm2 was decreased to 74 Ω cm2 by the addition of both nano-SiO2 and PP13TFSI into PEO18LiTFSI. 相似文献
14.
The high performance poly(vinyl alcohol)/titanium oxide nanotubes/poly(styrene sulfonic acid) (PVA/nt-TiO2/PSSA) proton-conducting composite membrane is prepared by a solution casting method. The characteristic properties of these blend composite membranes are investigated by thermal gravimetric analysis (TGA), scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDX), micro-Raman spectroscopy, dynamic mechanical analysis (DMA), methanol permeability measurement and AC impedance method. It is found that the peak power densities of the DMFC with 1, 2, and 4 M CH3OH fuels are 12.85, 23.72, and 10.99 mW cm−2, respectively, at room temperature and ambient air. Especially, among three methanol concentrations, the 2 M methanol shows the highest peak power density among three methanol concentrations. The results indicate that the air-breathing direct methanol fuel cell comprised of a novel PVA/nt-TiO2/PSSA composite polymer membrane has excellent electrochemical performance and stands out as a viable candidate for applications in DMFC. 相似文献