發(fā)布時間：2018-06-26 05:13

  本文選題：鋰空氣電池 + 有機電解液��； 參考：《材料導(dǎo)報》2017年12期

【摘要】：以硝酸鋰-二甲基乙酰胺(LiNO_3-DMA)有機電解液體系為基礎(chǔ),向電解液體系添加溶劑二甲基亞砜(DMSO),研究分析了混合溶劑電解液的物化性質(zhì)、恒流充放電及反應(yīng)機理。DMSO的添加可以使鋰負(fù)極形成穩(wěn)定的固體電解質(zhì)相界面(SEI)膜,有效增強了LiNO_3-DMA與鋰的化學(xué)兼容性,降低了極化阻抗,因此循環(huán)性能有所提高。截止比容量為1 000mAh/gcarbon、電流密度為0.2mA/cm~2時可穩(wěn)定循環(huán)40周。SEM及XRD分析表明,LiNO_3-DMA和LiNO_3-DMA/DMSO放電均生成可循環(huán)產(chǎn)物L(fēng)i_2O_2,但DMSO中的疏水性甲基抑制了LiNO_3-DMA中副產(chǎn)物L(fēng)iOH的生成。此外,LiNO_3-DMA循環(huán)過程中生成了含硫化合物,這是導(dǎo)致放電終止的重要原因。
[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.
【作者單位】： 電子科技大學(xué)電子薄膜與集成器件國家重點實驗室;
【基金】：電子預(yù)研基金(BW040418)
【分類號】：TM911.41

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本文編號：2069263