Synthesis of aminoalkylsilanes with oligo(ethylene oxide) unit as multifunctional electrolyte additives for lithium-ion batteries
作者:JingLun Wang、Hao Luo、YongJin Mai、XinYue Zhao、LingZhi Zhang
DOI:10.1007/s11426-013-4861-5
日期:2013.6
Aminoalkylsilanes with oligo(ethylene oxide) units were designed and synthesized as multifunctional electrolyte additives for lithium-ion batteries. The chemical structures were fully characterized by nuclear magnetic resonance (NMR) spectroscopy and their thermal properties, viscosities, electrochemical windows, and ionic conductivities were systematically measured. With adding one of these compounds (1 vol. %, DSC3N1) in the baseline electrolyte 1.0 M LiPF6 in EC: DEC (1:1, in volume), Li/LiCoO2 half cell tests showed an improved cyclability after 100 cycles and improved rate capability at 5C rate condition. Electrochemical impedance spectroscopy (EIS), X-ray photoelectron spectroscopy (XPS), and energy dispersive spectroscopic (EDS) analysis confirmed the acid scavenging function and film forming capability of DSC3N1. These results demonstrated that the multifunctional organosilicon compounds have considerable potential as additives for use in lithium-ion batteries.
设计并合成了含有聚(氧化乙烯)单元的氨基烷基硅烷作为多功能电解液添加剂,用于锂离子电池。通过核磁共振(NMR)光谱全面表征了其化学结构,并系统测量了它们的热性能、粘度、电化学窗口和离子电导率。在基线电解液1.0 M LiPF6 in EC: DEC(体积比1:1)中添加一种化合物(1 vol.%,DSC3N1)后,Li/LiCoO2半电池测试显示在100次循环后循环性能提高,并且在5C倍率条件下提高倍率能力。电化学阻抗谱(EIS)、X射线光电子能谱(XPS)和能量分散谱分析证实了DSC3N1的酸捕获功能和成膜能力。这些结果表明,多功能有机硅化合物作为锂离子电池添加剂具有很大的潜力。