| 二甲基亚砜对有机电解液锂空气电池性能的影响 |
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| 引用本文： | 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. DOI: 10.11896/j.issn.1005-023X.2017.012.001 |
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| 作者姓名： | 卢云 王伟 宫岩坤 沈逸欣 冯孟杰 |
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| 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,成都,610054 |
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| 基金项目： | 电子预研基金(BW040418) |
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| 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。
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| 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 |
Influence of DMSO on Performance of Organic Electrolyte Li-air Cells |
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| LU Yun,WANG Wei,GONG Yankun,SHEN Yixin and FENG Mengjie. Influence of DMSO on Performance of Organic Electrolyte Li-air Cells[J]. Materials Review, 2017, 31(12): 1-5. DOI: 10.11896/j.issn.1005-023X.2017.012.001 |
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| Authors: | LU Yun WANG Wei GONG Yankun SHEN Yixin FENG Mengjie |
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| Affiliation: | State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054,State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054,State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054,State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054 and State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054 |
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| Abstract: | 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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| Keywords: | Li-air cell organic electrolyte component solvent lithium nitrate in the solvent N N-dimethyl acetamide (LiNO3-DMA) dimethyl sulfoxide(DMSO) |
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