Uncovering the role of organic species in the SEI on graphite for fast K+ transport and long-life potassium-ion batteries†

IF 32.4 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Ying Mo, Wang Zhou, Kexuan Wang, Wenwen Yang, Zixu Liu, Shi Chen, Peng Gao and Jilei Liu
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Abstract

The performance of potassium-ion batteries (PIBs) with a graphite anode is highly dependent on the composition of the solid electrolyte interphase (SEI), which includes both organic and inorganic species. Currently, most research focuses on constructing an inorganic-rich SEI, while the critical role of organic components is barely understood, thus hindering the rational regulation of SEI chemistry. Herein, a tailored SEI composition with controllable organic/inorganic ratios on the graphite surface was obtained by simply adjusting the temperature. A series of experiments were conducted to evaluate their ionic transport capabilities and stability using Prussian white/graphite full cells. The organic component was identified as playing a crucial role in enhancing the kinetics. Consequently, the full cell with an organic-rich SEI (such as –(CH2CH2O)n–) exhibited good rate capability, whereas the full cell with an inorganic-rich SEI (such as KF) demonstrated excellent cycling performance. In comparison, the full cell with an organic–inorganic balanced SEI could provide fast K+ transport capabilities and good mechanical stability synergistically, thereby achieving good rate performance and cycling stability. Our research reveals the critical role of organic components in the SEI for optimizing K+ storage performance, providing valuable guidance for the rational design of SEI and offering significant potential for the development of high-performance PIBs.

Abstract Image

石墨上SEI中有机物质对钾离子快速传输和长寿命钾离子电池的作用
石墨阳极钾离子电池(PIBs)的性能高度依赖于固体电解质界面(SEI)的组成,其中包括有机和无机物质。目前,大多数研究都集中在构建富无机的SEI上,而有机组分的关键作用知之甚少,阻碍了SEI化学的合理调控。本文通过简单地调节温度,获得了石墨表面有机/无机比例可控的SEI组合物,并利用普鲁士白/石墨全电池进行了一系列实验,以了解其离子传输能力和稳定性。有机成分被认为是提高动力学的关键。因此,具有富有机物SEI(如-(CH2CH2O)n-)的全电池具有良好的倍率能力,而具有富无机SEI(如KF)的全电池具有优异的循环性能。而具有有机-无机平衡SEI的全电池可以协同提供快速的K+传输能力和良好的机械稳定性,从而获得良好的倍率性能和循环稳定性。我们的研究揭示了有机成分在SEI中对优化K+存储性能的关键作用,为SEI的合理设计提供了有价值的指导,并为高性能PIBs的发展提供了巨大的潜力。
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来源期刊
Energy & Environmental Science
Energy & Environmental Science 化学-工程:化工
CiteScore
50.50
自引率
2.20%
发文量
349
审稿时长
2.2 months
期刊介绍: Energy & Environmental Science, a peer-reviewed scientific journal, publishes original research and review articles covering interdisciplinary topics in the (bio)chemical and (bio)physical sciences, as well as chemical engineering disciplines. Published monthly by the Royal Society of Chemistry (RSC), a not-for-profit publisher, Energy & Environmental Science is recognized as a leading journal. It boasts an impressive impact factor of 8.500 as of 2009, ranking 8th among 140 journals in the category "Chemistry, Multidisciplinary," second among 71 journals in "Energy & Fuels," second among 128 journals in "Engineering, Chemical," and first among 181 scientific journals in "Environmental Sciences." Energy & Environmental Science publishes various types of articles, including Research Papers (original scientific work), Review Articles, Perspectives, and Minireviews (feature review-type articles of broad interest), Communications (original scientific work of an urgent nature), Opinions (personal, often speculative viewpoints or hypotheses on current topics), and Analysis Articles (in-depth examination of energy-related issues).
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