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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Compatibility of lithium salts with solvent of the non-aqueous electrolyte in Li-O2 batteries
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Compatibility of lithium salts with solvent of the non-aqueous electrolyte in Li-O2 batteries

机译：锂盐与Li-O2电池中非水电解质溶剂的相容性

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摘要

The stability of lithium salts, especially in the presence of reduced oxygen species, O2 and H2O (even in a small amount), plays an important role in the cyclability and capacity of Li-O2 cells. This combined experimental and computational study provides evidence that the stability ofthe electrolyte used in Li-O2 cells strongly depends on the compatibility of lithium salts with solvent. In the case of the LiPF6-1NM3 electrolyte, the decomposition of LiPF6 occurs in the cell as evidenced by in situ XRD, FT-IR and XPS analysis, which triggers the decomposition of 1NM3 solvent due to formation of HF from the decomposition of LiPF6. These reactions lead to degradation of the electrolyte and cause poor cyclability of the cell. The same reactions are not observed when LiTFSI and LiCF3SO3 are used as the lithium salts in 1NM3 solvent, or LiPF6 is used in TEGDME solvent.
机译：锂盐的稳定性，特别是在氧含量降低的氧气，O2和H2O（甚至少量）存在下，对Li-O2电池的循环能力和容量起着重要作用。这项结合实验和计算的研究提供了证据，证明用于Li-O2电池的电解质的稳定性很大程度上取决于锂盐与溶剂的相容性。对于LiPF6-1NM3电解质，原位XRD，FT-IR和XPS分析证明，LiPF6会在电池中发生分解，这会由于LiPF6分解形成HF而触发1NM3溶剂分解。这些反应导致电解质的降解并导致电池的循环性差。当在1NM3溶剂中使用LiTFSI和LiCF3SO3作为锂盐，或在TEGDME溶剂中使用LiPF6时，未观察到相同的反应。

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