Electrolyte‐Regulated Solid‐Electrolyte Interphase Enables Long Cycle Life Performance in Organic Cathodes for Potassium‐Ion Batteries,Advanced Functional Materials

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Electrolyte‐Regulated Solid‐Electrolyte Interphase Enables Long Cycle Life Performance in Organic Cathodes for Potassium‐Ion Batteries
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-12-13 , DOI: 10.1002/adfm.201807137
Benfang Li ₁ , Jin Zhao ₁ , Zihe Zhang ₂ , Chen Zhao ₁ , Pengfei Sun ₁ , Panxing Bai ₁ , Jixing Yang ₁ , Zhen Zhou _{2,

3} , Yunhua Xu _{1,

3}

Affiliation

Organic cathode materials as economical and environment‐friendly alternatives to inorganic cathode materials have attracted comprehensive attention in potassium‐ion batteries (KIBs). Nonetheless, active material dissolution and mismatched electrolytes result in insufficient cycle life that definitely hinders their practical applications. Here, a significantly improved cycle life of 1000 cycles (80% capacity retention) on a practically insoluble organic cathode material, anthraquinone‐1,5‐disulfonic acid sodium salt, is realized, in KIBs through a solid‐electrolyte interphase (SEI) regulation strategy by ether‐based electrolytes. Such an excellent performance is attributed to the robust SEI film and fast reaction kinetics. More importantly, the ether‐electrolyte‐derived SEI film has a protective inorganic‐rich inner layer arising from the prior decomposition of potassium salts to solvents, as revealed by X‐ray photoelectron spectroscopy analysis and computational studies on molecular orbital energy levels. The findings shed light on the critical roles of electrolytes and the corresponding SEI films in enhancing performance of organic cathodes in KIBs.

中文翻译：

电解质调节的固体电解质中间相可实现钾离子电池有机阴极的长循环寿命性能

有机阴极材料作为无机阴极材料的经济和环保替代品已引起钾离子电池（KIB）的广泛关注。然而，活性物质的溶解和电解质的不匹配导致循环寿命不足，这无疑阻碍了它们的实际应用。在这里，通过固体电解质界面（SEI）调节，在KIB中实现了几乎不溶的有机阴极材料蒽醌-1,5-二磺酸钠盐的1000次循环（容量保持率达到80％）的显着改善。基于醚的电解质的策略。如此出色的性能归因于坚固的SEI膜和快速的反应动力学。更重要的是，X射线光电子能谱分析和分子轨道能级的计算研究表明，醚电解质衍生的SEI膜具有保护性的富含无机物的内层，该内层是由钾盐先分解为溶剂而形成的。这些发现揭示了电解质和相应的SEI膜在增强KIB中有机阴极性能方面的关键作用。

更新日期：2018-12-13

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