共查询到18条相似文献,搜索用时 140 毫秒
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电解质作为锂电池离子传导的重要介质,对于提升锂电池循环稳定性能、安全性能等方面起着至关重要的作用,而锂盐作为其电解质(电解液)的关键组分,当锂盐浓度较低时,存在易燃性高、热稳定性差、电极反应动力学缓慢等缺点,而高浓度锂盐电解质具有热力学稳定性良好,Li+在电极上可进行可逆嵌入/脱出反应,离子载体密度较高,溶剂挥发性降低,提高SEI膜的热稳定性和抑制Al集流体腐蚀等优点,但也存在离子电导率低、润湿性差和材料成本高等问题,限制了商业化应用.概述了新型锂盐、高浓度锂盐电解质研究历程、溶剂化结构对界面性质的影响及高浓度电解质在锂电池体系中的应用,为解决高浓度锂盐电解质的局限性和加快商业化应用提供一些思路. 相似文献
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Mao-Sung Wu Tzu-Ling Liao Yung-Yun Wang Chi-Chao Wan 《Journal of Applied Electrochemistry》2004,34(8):797-805
The wettability of lithium cobalt oxide (LiCoO2) and mesocarbon microbead electrodes in nonaqueous electrolyte is analyzed by a mathematical model of capillary liquid movement. Results show that wetting in the LiCoO2 electrodes is difficult as compared with the MCMB electrodes at the same electrolyte composition. Wetting in the porous electrodes is controlled mainly by electrolyte penetration and spreading in pores. Electrolyte penetration is determined by viscosity. On the other hand, electrolyte spreading is controlled by surface tension. Organic solvent composition and lithium salt concentration may influence the wettability of porous electrodes due to changes in the viscosity and surface tension of the electrolyte. Increasing the amount of EC and/or lithium salts can cause poorer electrolyte spreading and penetration. Furthermore, careful pressure control has a positive effect on increasing the surface area of the solid–liquid interface. AC impedance data show that batteries with vacuuming prior to electrolyte filling may reach a maximum wetting in a few hours. If no vacuuming is applied, a few days are required to obtain sufficient wetting. 相似文献
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A new gel-type polymer electrolyte (GPE) was made by the copolymerizing acrylonitrile (AN) and (2-methylacrylic acid 3-(bis-carboxymethylamino)-2-hydroxy-propyl ester) (GMA-IDA). The copolymer mixed with a plasticizer—propylene carbonate (PC) and lithium salt to form GPE. The lithium salts are LiCF3SO3, LiBr and LiClO4. FT-IR spectra show that the lithium ion in the LiClO4 system has the strongest interaction with the group based on the plasticized polymer. FT-IR spectra also indicate that CF3SO3− prefers producing anion-cation association. Moreover, the 13C solid state NMR spectra for the carbons attached to the PC of GPE exhibited different level of chemical shift (158.5 ppm) when the different lithium salts were added to the electrolyte. The results of differential scanning calorimeter (DSC) also indicate that the LiClO4 system has more free lithium ions; therefore, it has the maximum conductivity. In this study, the highest conductivity 2.98 × 10−3 S cm−1 exists in AG2/PC = 20/80 wt.% system which contain 3 mmole (g-polymer)−1 LiClO4. Additionally, the polymer electrolytes, which contain GMA-IDA have better interfacial resistance stability with lithium electrode. 相似文献
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Hekselman 《Electrochimica acta》2010,55(4):1298-4569
In this article the impact of anion receptor (1,1,3,3,5,5-meso-hexaphenyl-2,2,4,4,6,6-meso-hexamethyl-calix[6]pyrrole) on physicochemical and ion transport properties of poly(ethylene oxide)-salt composites is discussed. Two salts, lithium triflate and lithium bis(trifluoromethane) sulfonamide, were tested. It is shown that addition of the anion receptor significantly increases glass transition temperature of the composite suggesting changes in the velocity of segmental motions of the polymeric matrix. Also some discrepancies between crystallinity of the electrolyte measured by means of DSC and the one measured by means of XRD for lithium triflate containing electrolytes are discussed. It is proved that the influence of the anion receptor on electrolyte properties depends on the coordinating properties of the anion. In consequence this two structurally similar anions are found to reveal opposite behavior. In systems containing LiTf significant changes in properties are observed upon receptor addition. Contrastively, LiTfSI does not interact with receptor and obtained samples exhibit non-homogenous structure with consequent receptor participation. 相似文献
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本文提出了将高离子电导率的全固态电解质Li1.4Al0.4Ti1.6(PO3)4(LATP)用于锂氧电池。用Pechini法成功的合成了全固态电解质,采用X射线荧光衍射(XRD)、场发射扫描电子显微镜(SEM)和电化学性能分析其性能。结果显示,LATP不仅具有较高的离子导电性,而且LATP作为固体电解质,具有更高的放电平台。同时,LATP固体电解质能降低电解质的分解,从而能够减少放电产物的生成。因此,LATP玻璃陶瓷固体用于锂氧电池提高了锂氧电池的热稳定性并且降低了锂氧电池热膨胀。LATP固体电解质利用在可再充电锂氧电池中具有良好的前景。 相似文献