共查询到20条相似文献,搜索用时 46 毫秒
1.
随着新能源技术的不断发展, 大规模储能技术受到了广泛的关注. 全钒液流电池因其容量和功率设计灵活、安全可靠、寿命长等优势成为发展较快的储能电池之一. 离子膜作为液流电池的关键部件, 对电池的能量转化效率、寿命和成本具有显著影响. 本工作以高化学稳定性的聚偏氟乙烯作为膜材料, 利用聚乙二醇和聚乙烯吡咯烷酮分别作为模板和稳定剂, 在聚偏氟乙烯膜内成功构建了具有较好H/V离子选择性的三维离子传输通道. 电池性能测试表明, 该聚偏氟乙烯(PVDF)离子膜有着出色的化学稳定性, 在100 mA•cm-2电流密度下, 具有98%以上的电流效率和83.5%的能量效率. 此外, 聚偏氟乙烯具有价格低的显著特点, 使其在全钒液流电池中有较好的应用前景. 相似文献
2.
全钒液流电池作为一种电化学储能装置在电网调峰、山区供电、电动车充电电源、应急电源等方面具有很广阔的应用前景。隔膜是全钒液流电池的关键组件之一,其结构和性能决定电池的效能。隔膜的离子传导率和钒离子的渗透率分别影响电池的电压效率和电流效率。隔膜的化学稳定性决定电池的长期运行的稳定性和使用寿命。本文根据隔膜的类别不同,分别阐述了含氟离子膜、非氟离子膜及多孔膜的制备与上述性能的关系,并展望了隔膜的发展方向。 相似文献
3.
离子交换膜是液流电池的关键部件之一,理想的离子交换膜应具有较低的活性物质渗透率(即有较高的选择性)和较低的面电阻(即有较高的离子传导率),同时还应具有较好的化学稳定性和较低的成本。目前,全钒液流电池主要采用全氟磺酸类阳离子交换膜(如Nafion),其化学稳定性优异,但易造成钒离子的渗透,降低了电池的使用寿命,且Nafion膜价格昂贵;全钒液流电池的电解质溶液由不同钒电解质溶解在硫酸中组成,采用阴离子交换膜时, 相似文献
4.
5.
离子交换膜是液流电池的关键部件之一,理想的离子交换膜应具有较低的活性物质渗透率(即有较高的选择性)和较低的面电阻(即有较高的离子传导率),同时还应具有较好的化学稳定性和较低的成本[1,2].目前,全钒液流电池主要采用全氟磺酸类阳离子交换膜(如Nafion),其化学稳定性优异,但易造成钒离子的渗透,降低了电池的使用寿命,且Nafion膜价格昂贵;全钒液流电池的电解质溶液由不同钒电解质溶解在硫酸中组成,采用阴离子交换膜时,由于Donan效应钒离子的渗透将受到制约,与阳离子交换膜相比,具有较高的选择性. 相似文献
6.
大规模储能技术是实现大规模可再生能源普及应用和支撑智能电网建设的核心技术. 全钒液流电池(Vanadium Flow Battery, VFB)因其寿命长、安全性好、配置灵活、响应速度快、建设周期短、对环境影响低等突出优势,成为大规模电化学储能技术的首选. 美、日、欧等发达国家都在积极推动大型全钒液流电池技术和装备的研发. 本文重点介绍了由大连融科储能技术发展有限公司和中科院大连化学物理研究所开发的集装箱式全钒液流电池系统的测试结果,对迄今全球最大规模的5 MW/10 MWh全钒液流电池系统的运行情况进行了总结,最后指出通过进一步技术开发与规模化生产,降低其成本、提高其可靠性和电化学性能,是全钒液流电池技术和产业发展的主要方向. 相似文献
7.
8.
9.
液流储能电池技术是一种高效、大规模电化学储能技术,在风能、太阳能等可再生能源发电、智能电网建设等方面有着广阔的应用前景。本文重点对全钒、多硫化钠-溴和锌-溴液流储能电池的工作原理、特点、国内外研究现状及发展趋势进行了综述,并对其他探索性液流储能电池体系进行了介绍。提出了制约液流储能电池技术发展瓶颈问题,展望了液流储能电池未来发展趋势。 相似文献
10.
11.
荷电膜的膜电位研究进展 总被引:1,自引:0,他引:1
膜电位的测定是表征荷电膜的传递现象的重要参数之一。本文简要介绍了膜电位理论基础,包括T. M. S.理论和不可逆热力学理论。分别阐述了关于离子交换膜、双极膜、两性膜以及复合膜的膜电位的最新进展,并提出今后的发展方向。 相似文献
12.
13.
14.
15.
16.
Zeolite X membranes were investigated by in-situ hydrothermal synthesis on porous ceramic tubes precoated with zeolite X seeds or precursor amorphous aluminosilicate, and porous α-Al2O3 ceramic tubes with a pore size of 50 200 nm were employed as supports. Zeolite X crystals were synthesized by the classic method and mixed into deionized water as a slurry with a concentration of 0.2 0.5wt%, having a range of crystal sizes from 0.2 to 2μm. Crystal seeds were pressed into the pores near the inner surface of the ceramic tubes, and crystallization took place at 95℃ for 24-96 h. It was also investigated that Boehmite sol added with zeolite X seeds was precoated on ceramic supports to form a layer of γ-Al2O3 by heating, and hydrothermal crystallization could then take place to prepare the zeolite membranes on the composite ceramic tubes. The crystal species were characterized by XRD, and the morphology of the supports subjected to crystallization was characterized by SEM. The composite zeolite membranes have zeolitic top-layers with a thickness of 10-25 μm, and zeolite crystals can be intruded into pores of the supports as deeply as 100μm. The experimental results indicate that the precoating of zeolitic seeds on supports is beneficial to crystallization by shortening the synthesis time and improving the membrane strength. The resulting zeolite X membrane shows permselectivity to tri-n-butylamine((C4H9)3N) over perfluro-tributyl-amine ((C4Fg)3N), and a permeance ratio of 57 for ((C4Hg)3N to (C4F9)3N could be reached at 350℃. Permeances of BZ, EB and TIPB through the zeolite membrane were also measured and were found to slightly increase with temperature. 相似文献
17.
18.
PREPARATIONOFSILICALITE┐1ANDZSM┐5ZEOLITE/CERAMICCOMPOSITEMEMBRANESZhangLixiong,JiaMengdong,MinEnze(ResearchInstituteofPetrole... 相似文献
19.
Zhongqiang Xu Qingling Chen Guanzhong LuShanghai Research Institute of Petrochemical Technology Shanghai ChinaInstitute of Industrial Catalysis East China University of Science Technology Shanghai China 《天然气化学杂志》2002,(Z2)
Zeolite X membranes were investigated by in-situ hydrothermal synthesis on porous ceramic tubes precoated with zeolite X seeds or precursor amorphous aluminosilicate, and porous α-Al2O3 ceramic tubes with a pore size of 50-200 nm were employed as supports. Zeolite X crystals were synthesized by the classic method and mixed into deionized water as a slurry with a concentration of 0.2-0.5wt%, having a range of crystal sizes from 0.2 to 2μm. Crystal seeds were pressed into the pores near the inner surface of the ceramic tubes, and crystallization took place at 95℃ for 24-96 h. It was also investigated that Boehmite sol added with zeolite X seeds was precoated on ceramic supports to form a layer of r-Al2O3 by heating, and hydrothermal crystallization could then take place to prepare the zeolite membranes on the composite ceramic tubes. The crystal species were characterized by XRD, and the morphology of the supports subjected to crystallization was characterized by SEM. The composite zeolite membranes hav 相似文献
20.
A model of the composite membrane consisting of the catalytic layer (CL) and the nanofiltration layer (NFL) is presented. It has been found that applying NFL on the permeate side of CL it is possible to enhance substantially the conversion of substrate into the product. The best performance is obtained for high retention of substrate and low of product. At higher values of volume flow and/or longer catalytic path the retention degree of product becomes negligible. The presence of NFL enhances the influence of distribution of the reaction rate constant, k, on the conversion ratio. Comparing to k = constant the positive effect is obtained if k increases along the catalytic pore, whereas negative—if k decreases. 相似文献