Ion dynamics in halogen-free phosphonium bis(salicylato)borate ionic liquid electrolytes for lithium-ion batteries.
Ion dynamics in halogen-free phosphonium bis(salicylato)borate ionic liquid electrolytes for lithium-ion batteries.
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DOI：
10.1039/c7cp02722b
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发表时间：
2017-06
期刊：
影响因子：
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通讯作者：
Faiz Ullah Shah;O. Gnezdilov;A. Filippov
中科院分区：
文献类型：
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作者：
Faiz Ullah Shah;O. Gnezdilov;A. Filippov
本研究重点研究锂离子电池用无卤、疏水且水解稳定的双(水杨酸)硼酸鏻 [P4,4,4,8][BScB] 离子液体电解质中的离子动力学。使用1H、13C、31P和11B NMR光谱对合成的离子液体和双(水杨酸)硼酸锂Li[BScB]盐的结构和纯度进行了表征。将Li[BScB]盐与浓度范围为2.5 mol%至20 mol%的离子液体混合。使用热分析（TGA 和 DSC）、电阻抗光谱、脉冲场梯度 (PFG) NMR 和 ATR-FTIR 光谱来表征所得电解质的物理化学性质。各个离子的表观转移数通过 PFG NMR 光谱测定的阳离子和阴离子的扩散系数计算得出。 NMR 和 ATR-FTIR 光谱技术揭示了电解质中锂阳离子和双（水杨酸）硼酸根阴离子之间的动态相互作用。发现离子-离子相互作用随着Li[BScB]盐浓度的增加而增加，这导致离子液体中Li盐浓度高于15 mol%时离子聚集。
This study was focused on the investigation of ion dynamics in halogen-free, hydrophobic, and hydrolytically stable phosphonium bis(salicylato)borate [P4,4,4,8][BScB] ionic liquid electrolytes for lithium-ion batteries. The structure and purity of the synthesized ionic liquid and lithium bis(salicylato)borate Li[BScB] salt were characterized using 1H, 13C, 31P, and 11B NMR spectroscopy. The Li[BScB] salt was mixed with an ionic liquid at the concentrations ranging from 2.5 mol% to 20 mol%. The physicochemical properties of the resulting electrolytes were characterized using thermal analysis (TGA and DSC), electrical impedance spectroscopy, and pulsed-field gradient (PFG) NMR and ATR-FTIR spectroscopy. The apparent transfer numbers of the individual ions were calculated from the diffusion coefficients of the cation and anion as determined via the PFG NMR spectroscopy. NMR and ATR-FTIR spectroscopic techniques revealed dynamic interactions between the lithium cation and bis(salicylato)borate anion in the electrolytes. The ion-ion interactions were found to increase with the increasing concentration of the Li[BScB] salt, which resulted in ionic clustering at the concentrations higher than 15 mol% of Li salt in the ionic liquid.