Shah Faiz Ullah, Gnezdilov Oleg I, Gusain Rashi, Filippov Andrei
Chemistry of Interfaces, Luleå University of Technology, Luleå, SE-97187, Sweden.
Institute of Physics, Kazan Federal University, 420008, Kazan, Russia.
Sci Rep. 2017 Nov 27;7(1):16340. doi: 10.1038/s41598-017-16597-7.
Ion transport behaviour of halogen-free hybrid electrolytes for lithium-ion batteries based on phosphonium bis(salicylato)borate [P][BScB] ionic liquid mixed with diethylene glycol dibutyl ether (DEGDBE) is investigated. The Li[BScB] salt is dissolved at different concentrations in the range from 0.15 mol kg to 1.0 mol kg in a mixture of [P][BScB] and DEGDBE in 1:5 molar ratio. The ion transport properties of the resulting electrolytes are investigated using viscosity, electrical impedance spectroscopy and pulsed-Field Gradient (PFG) NMR. The apparent transfer numbers of ions are calculated from the diffusion coefficients measured by using PFG NMR. PFG NMR data suggested ion association upon addition of Li salt to the [P][BScB] in DEGDBE solution. This is further confirmed by liquid state Li and B NMR, and FTIR spectroscopic techniques, which suggest strong interactions between the lithium cation and oxygen atoms of the [BScB] anion in the hybrid electrolytes.
研究了基于双（水杨酸根）硼酸鏻盐[P][BScB]离子液体与二甘醇二丁醚（DEGDBE）混合的锂离子电池无卤混合电解质的离子传输行为。Li[BScB]盐以不同浓度溶解在[P][BScB]与DEGDBE摩尔比为1:5的混合物中，浓度范围为0.15 mol kg至1.0 mol kg。使用粘度、电阻抗谱和脉冲场梯度（PFG）核磁共振研究所得电解质的离子传输性质。通过使用PFG NMR测量的扩散系数计算离子的表观迁移数。PFG NMR数据表明，在DEGDBE溶液中向[P][BScB]中添加锂盐后会发生离子缔合。液态锂和硼核磁共振以及傅里叶变换红外光谱技术进一步证实了这一点，这些技术表明混合电解质中锂阳离子与[BScB]阴离子的氧原子之间存在强相互作用。
