共查询到17条相似文献,搜索用时 109 毫秒
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离子液体聚合物电解质的研究进展 总被引:3,自引:3,他引:0
离子液体聚合物电解质具有电导率高、力学性能和稳定性能好等特点.综述了离子液体聚合物电解质的分类、制备方法及其在电池中的应用现状,包括含浸离子液体的聚合物电解质和聚合物分子上引入离子液体结构得到的离子液体聚合物电解质.对离子液体聚合物电解质的未来发展进行了展望. 相似文献
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正超级电容器通过将离子存储在浸泡于电解质溶液中的两极板上来储存电荷。一直以来,科研人员都在努力提高超级电容器可存储电荷的能力。由于超级电容器可存储离子的数量与极板的表面积密切相关,所以科研人员通常都会在极板上涂覆一些多孔材料来增大表面积,如将活性炭、碳纳米管等多孔材料沉积在极板上。但是这些尝试所取得的进展都微乎其微,而且这些方法还很难重复持续地进行。范德堡大学的助理教授Cary Pint和其同事通过一种特别的新角度,用多孔硅来制作超级电容器。这种方法乍 相似文献
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随着生产的发展、生活水平的提高,人们对能源存储的要求越来越高.超级电容器具有使用寿命长、功率密度高等特点,近年来已被广泛应用到电动汽车、通信、电力电子系统等领域.王凯等著的《超级电容器及其在储能系统中的应用》一书聚焦于超级电容器的研究,对超级电容器的结构组成、电极材料、电解质、热行为、性能测试方法以及健康管理方法等进行... 相似文献
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离子液体/聚合物电解质在双电层电容器中的应用 总被引:1,自引:0,他引:1
以P(VDF-HFP)为基体,与离子液体1-乙基-3-甲基咪唑钅翁四氟硼酸盐(EMIBF4)和1-丁基-3-甲基咪唑钅翁六氟磷酸盐(BMIPF6)制备出离子液体/聚合物电解质凝胶膜,并组装了活性炭电极双电层电容器(EDLC)。基于EMIBF4/P(VDF-HFP)和BMIPF6/P(VDF-HFP)聚合物电解质(质量比2∶1)的双电层电容器,比电容分别为38.5 F/g和20.9 F/g。基于EMIBF4/P(VDF-HFP)的双电层电容器显示了优良的电化学性能。 相似文献
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W. Opydo A. Lewandowski M. Galiński A. Świderska-Mocek M. Krzyżanowski M. Zajder 《Electrical Engineering (Archiv fur Elektrotechnik)》2006,88(2):83-88
The aim of this work was to investigate the properties of electrochemical capacitors under alternating voltage conditions,
from the point of view of their possible application to power-factor correction in the power system. The electrochemical capacitors
were based on different carbon materials as well as on the following electrolytes: aqueous alkaline, organic salts dissolved
in non-aqueous solvents, and room temperature ionic liquids. The capacitors with the electrolytes based on ionic liquids showed
the best characteristics. The specific capacity of carbon-based capacitors, filled with ionic liquids, may reach the level
of 35 mF/kg at AC voltage of 230 V at 50 Hz. 相似文献
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合成了1-甲基-3-乙基咪唑二(三氟甲基磺酰)亚胺(EMI-TFSI)和1-丁基-3-乙基咪唑二(三氟甲基磺酰)亚胺(BMI-TFSI)两种离子液体,并分别研究了它们的各种电化学性质。结果表明,两种离子液体的电化学窗口分别为4.8V和4.6V,离子液体电解质的室温电导率分别为5.4mS/cm和1.6mS/cm。使用LiCoO2和LiFePO4作为锂离子电池正极材料,分别以EMI-TFSI+1.0mol/LLiTFSI、BMI-TFSI+1.0mol/LLiTFSI为电解质组装半电池,测试其循环性能,结果表明:LiCoO2与两种离子液体电解质的相容性较差,而采用LiFePO4正极,以EMI-TFSI+1.0mol/LLiTFSI为电解质组装的半电池具有较高的比容量,经过20次循环(0.1C)几乎无衰减,比容量仍保持在120mAh/g以上,表现出较好的循环能力。 相似文献
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All-solid-state batteries with ceramic electrolytes and lithium metal anodes represent an attractive alternative to conventional ion battery systems. Conventional batteries still rely on flammable liquids as electronic insulators. Despite the great efforts reported over the last years, the optimum solid electrolyte has, however, not been found yet. One of the most important properties which decides whether a ceramic is useful to work as electrolyte is ionic transport. The various time-domain nuclear magnetic resonance (NMR) techniques might help characterize and select the most suitable candidates. Together with conductivity measurements it is possible to analyze ion dynamics on different length-scales, i.e., to differentiate between local, within-site hopping processes from long-range ion transport. The latter needs to be sufficiently fast in the ceramic, in the best case competing with that of liquid electrolytes. In addition to conductivity spectroscopy, NMR can help understand the relationship between local structure and dynamic parameters. Besides information on activation energies and jump rates the data also contain suggestions about the relevant elementary steps of ion hopping and, thus, diffusion pathways through the crystal lattice. Recent progress in characterizing ion dynamics in ceramic electrolytes by NMR relaxometry will be briefly reviewed. Focus is put on presently discussed solid electrolytes such as garnets, phosphates and sulfides, which have so far been studied in our lab. 相似文献