| 卢云,王伟,宫岩坤,沈逸欣,冯孟杰.二甲基亚砜对有机电解液锂空气电池性能的影响[J].材料导报,2017,31(12):1-5 |
| 二甲基亚砜对有机电解液锂空气电池性能的影响 |
| Influence of DMSO on Performance of Organic Electrolyte Li-air Cells |
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| DOI：10.11896/j.issn.1005-023X.2017.012.001 |
| 中文关键词: 锂空气电池 有机电解液 混合溶剂 硝酸锂-二甲基乙酰胺 二甲基亚砜 |
| 英文关键词: Li-air cell, organic electrolyte, component solvent, lithium nitrate in the solvent N, N-dimethyl acetamide (LiNO3-DMA), dimethyl sulfoxide(DMSO) |
| 基金项目:电子预研基金(BW040418) |
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| 摘要点击次数: 21446 |
| 全文下载次数: 2099 |
| 中文摘要: |
| 以硝酸锂-二甲基乙酰胺(LiNO3-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LiNO3-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1 000 mAh/gcarbon、电流密度为0.2 mA/cm2时可稳定循环40周。SEM及XRD分析表明,LiNO3-DMA和LiNO3-DMA/DMSO放电均生成可循环产物Li2O2,但DMSO中的疏水性甲基抑制了LiNO3-DMA中副产物LiOH的生成。此外,LiNO3-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。 |
| 英文摘要: |
| Lithium nitrate (LiNO3) in the solvent N, N-dimethyl acetamide (DMA) was regarded as a base, by adding thereto solvent dimethyl sulfoxide (DMSO), chemical and physical properties of complexing solvent, charging profile and reaction mechanism were investigated. Electrolyte with DMSO added in LiNO3-DMA is capable of forming a protective solid-electrolyte interphase (SEI) on Li anode, which effectively enhances the chemical compatibility and reduces the polarization resistance of LiNO3-DMA so that the charging profile has been improved. The Li-air cell stably cycled 40 times with capacity limited to 1 000 mAh/gcarbon at current density of 0.2 mA/cm2. SEM and XRD identified the discharge products of both LiNO3-DMA and LiNO3-DMA/DMSO are Li2O2, but hydrophobic methacrylic in DMSO inhibits formation of by-product LiOH. In addition, during LiNO3-DMA cycling S-containing compound can be generated which contributes much to discharge termination. |
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