Co-intercalation-free ether electrolytes for graphitic anodes in lithium-ion batteries,Energy & Environmental Science

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Co-intercalation-free ether electrolytes for graphitic anodes in lithium-ion batteries
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2022-10-11 , DOI: 10.1039/d2ee01489k
Peiyuan Ma ₁ , Priyadarshini Mirmira ₁ , Peter J. Eng _{2,

3} , Seoung-Bum Son ₄ , Ira D. Bloom ₄ , Alexander S. Filatov ₅ , Chibueze V. Amanchukwu ₁

Affiliation

Carbonate-based electrolytes are widely used in Li-ion batteries but are limited by a small operating temperature window and poor cycling with silicon-containing graphitic anodes. The lack of non-carbonate electrolyte alternatives such as ether-based electrolytes is due to undesired solvent co-intercalation that occurs with graphitic anodes. Here, we show that fluoroethers are the first class of ether solvents to intrinsically support reversible lithium-ion intercalation into graphite without solvent co-intercalation at conventional salt concentrations. In full cells using a graphite anode, they enable 10-fold higher energy densities compared to conventional ethers, and better thermal stability over carbonate electrolytes (operation up to 60 °C) by producing a robust solvent-derived solid electrolyte interphase (SEI). As single-solvent–single-salt electrolytes, they remarkably outperform carbonate electrolytes with fluoroethylene carbonate (FEC) and vinylene carbonate (VC) additives when cycled with graphite–silicon composite anodes. Our molecular design strategy opens a new class of electrolytes that can enable next generation Li-ion batteries with higher energy density and a wider working temperature window.

中文翻译：

用于锂离子电池石墨负极的无共插层醚电解质

碳酸盐基电解质广泛用于锂离子电池，但受到工作温度窗口小和含硅石墨负极循环不良的限制。非碳酸盐电解质替代品（如醚基电解质）的缺乏是由于石墨阳极发生不希望的溶剂共嵌入。在这里，我们表明，氟醚是第一类醚溶剂，可在常规盐浓度下本质上支持可逆锂离子嵌入石墨中而无需溶剂共嵌入。在使用石墨阳极的全电池中，与传统的醚相比，它们的能量密度提高了 10 倍，并且通过产生稳健的溶剂衍生固体电解质界面 (SEI)，其热稳定性优于碳酸盐电解质（工作温度高达 60°C）。作为单溶剂-单盐电解质，当使用石墨-硅复合负极循环时，它们的性能显着优于含有氟代碳酸亚乙酯 (FEC) 和碳酸亚乙烯酯 (VC) 添加剂的碳酸盐电解质。我们的分子设计策略开辟了一类新的电解质，可以使下一代锂离子电池具有更高的能量密度和更宽的工作温度窗口。

更新日期：2022-10-11

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