二甲基亚砜对有机电解液锂空气电池性能的影响

发布时间：2018-06-26 05:13

本文选题：锂空气电池 + 有机电解液　；参考：《材料导报》2017年12期

【摘要】：以硝酸锂-二甲基乙酰胺(LiNO_3-DMA)有机电解液体系为基础,向电解液体系添加溶剂二甲基亚砜(DMSO),研究分析了混合溶剂电解液的物化性质、恒流充放电及反应机理。DMSO的添加可以使锂负极形成稳定的固体电解质相界面(SEI)膜,有效增强了LiNO_3-DMA与锂的化学兼容性,降低了极化阻抗,因此循环性能有所提高。截止比容量为1 000mAh/gcarbon、电流密度为0.2mA/cm~2时可稳定循环40周。SEM及XRD分析表明,LiNO_3-DMA和LiNO_3-DMA/DMSO放电均生成可循环产物Li_2O_2,但DMSO中的疏水性甲基抑制了LiNO_3-DMA中副产物LiOH的生成。此外,LiNO_3-DMA循环过程中生成了含硫化合物,这是导致放电终止的重要原因。
[Abstract]:The physicochemical properties of lithium-dimethyl acetamide (LiNO3-DMA) electrolyte were studied by adding the solvent dimethyl sulfoxide (DMSO) to the electrolyte system based on the Lithium nitrate dimethylacetamide (LiNO3-DMA) organic electrolyte system. Constant current charge / discharge and reaction mechanism. The addition of DMSO can make the lithium anode form a stable solid electrolyte phase interface (SEI) film, which effectively enhances the chemical compatibility between LiNO3-DMA and lithium, reduces the polarization impedance, and improves the cycling performance. The cut-off capacity is 1 000 mAh/ g carbon, the current density is 0.2 Ma / cm ~ 2, the cycle can be stabilized for 40 weeks. SEM and XRD analysis show that both LiNO3-DMA and LiNO3-DMA-DMSO discharge can produce the circulating product LiStat _ 2O _ 2, but the hydrophobic methyl in DMSO inhibits the formation of LiOH in LiNO3-DMA. In addition, sulfur compounds are produced during the LiNo3-DMA cycle, which is an important cause of discharge termination.
【作者单位】：电子科技大学电子薄膜与集成器件国家重点实验室;
【基金】：电子预研基金(BW040418)
【分类号】：TM911.41

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