A solid electrolyte interphase (SEI) layer on a graphite anode plays a crucial role in deciding electrochemical properties of the electrode including the first Coulombic efficiency, rate capability, operating temperature, and long-term cycling stability. However, the ultrathin functional SEI layer is always naturally grown via electrolyte reduction decomposition reactions. Herein, we report a new strategy of in situ transformed solid electrolyte interphase of high stability by implanting a 4-vinylbenzoic acid (4-VBA) nanolayer on a mildly oxidized graphite surface. A 4-VBA layer of 40 nm contributes to the transformation of a robust and stable SEI layer, which not only significantly enhances the overall electrochemical performances of the natural graphite electrode but also greatly prolongs the cycle life of the full cell with the LiNi_0.6Co_0.2Mn_0.2O₂ cathode. The effectively suppressed surface evolution aroused from the stable organic SEI transformed from the implanted 4-VBA nanolayer explains the enhanced electrochemical properties.

中文翻译：

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通过在天然石墨表面上植入4-乙烯基苯甲酸纳米层的原位转化固体电解质中间相。

石墨阳极上的固体电解质中间相（SEI）层在决定电极的电化学性能（包括第一库仑效率，速率能力，工作温度和长期循环稳定性）方面起着至关重要的作用。然而，超薄功能性SEI层总是通过电解质还原分解反应自然地生长。在本文中，我们报告了一种通过在轻度氧化的石墨表面上植入4-乙烯基苯甲酸（4-VBA）纳米层来原位转变高稳定性固体电解质中间相的新策略。40 nm的4-VBA层有助于坚固而稳定的SEI层的转变，这不仅显着增强了天然石墨电极的整体电化学性能，而且大大延长了使用LiNi的整个电池的循环寿命_0.6 Co _0.2 Mn _0.2 O ₂阴极。由植入的4-VBA纳米层转化而来的稳定有机SEI引起的有效抑制的表面析出解释了增强的电化学性能。