Abstract Solid electrolyte interphase (SEI) has been extensively investigated in advanced lithium ion batteries, especially on graphite anode surface. However, the role of the carbon bond types on the formation of solid electrolyte interphase (SEI) on graphite surface has never been compared. In this work, single, double and triple carbon bonds on a graphite anode acting as SEI templates are comparatively investigated. Sodium propionate, sodium acrylate and sodium propynate are uniformly applied onto a natural graphite surface. It is found that different carbon types exhibit remarkable difference in the electrochemical behavior of the graphite anode. The acrylate SEI template demonstrates the best film-forming properties via in-situ polymerization between the carbon double bonds producing robust SEI film and the decorated graphite anode shows much enhanced rate capability and cycling stability. Moreover, life-span of the full cell with LiFePO4 cathode is significantly prolonged. By contrast, single and triple carbon bonds shows some limitations in the SEI formation. Therefore, constructing SEI film by in-situ polymerization of carbon double bonds is an effective strategy enhancing the durability and reliability of graphite anode.

中文翻译：

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碳键类型对石墨表面固体电解质界面形成的作用

摘要 固体电解质中间相（SEI）在先进的锂离子电池中得到了广泛的研究，特别是在石墨负极表面。然而，碳键类型对石墨表面固体电解质界面（SEI）形成的作用从未进行过比较。在这项工作中，对充当 SEI 模板的石墨阳极上的单、双和三碳键进行了比较研究。丙酸钠、丙烯酸钠和丙酸钠均匀地涂在天然石墨表面。发现不同的碳类型在石墨阳极的电化学行为上表现出显着差异。丙烯酸酯 SEI 模板通过碳双键之间的原位聚合展示了最佳的成膜性能，产生了坚固的 SEI 膜，装饰石墨阳极显示出大大增强的倍率能力和循环稳定性。此外，具有 LiFePO4 阴极的全电池的寿命显着延长。相比之下，单碳键和三碳键在 SEI 形成中显示出一些限制。因此，通过碳双键的原位聚合构建SEI膜是提高石墨负极耐久性和可靠性的有效策略。