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首页> 外文期刊>ACS applied materials & interfaces >Tris(trimethylsilyl) Phosphite as an Efficient Electrolyte Additive To Improve the Surface Stability of Graphite Anodes
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Tris(trimethylsilyl) Phosphite as an Efficient Electrolyte Additive To Improve the Surface Stability of Graphite Anodes

机译：Tris（三甲基甲硅烷基）亚磷酸盐作为一种有效的电解质添加剂，以改善石墨阳极的表面稳定性

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摘要

Tris(trimethylsilyl) phosphite (TMSP) has, received considerable attention as a functional additive for various cathode materials in lithium-ion batteries, but the effect of TMSP on the surface stability of a graphite anode has not been studied. Herein, we demonstrate that TMSP serves as an effective solid electrolyte interphase (SEI)-forming additive for graphite anodes in lithium-ion batteries (LIBs). TMSP forms SEI layers by chemical reactions between TMSP and a reductively decomposed ethylene carbonate (EC) anion, which is strikingly different from the widely known mechanism of the SET-forming additives. TMSP is stable under cathodic polarization, but it reacts chemically with radical anion intermediates derived from the electrochemical reduction of the carbonate solvents to generate a stable SEI layer. These TMSP-derived SEI layers improve the interfacial stability of the graphite anode; resulting in a retention of 96.8% and a high Coulombic efficiency of 95.2%. We suggest the use of TMSP as a functional additive that effectively stabilizes solid electrolyte interfaces of both the anode and cathode in lithium-ion batteries.
机译：TRIS（三甲基甲硅烷基）亚磷酸酯（TMSP）具有锂离子电池中各种阴极材料的功能性添加剂，但TMSP对石墨阳极的表面稳定性的影响尚未研究。在此，我们证明TMSP用作锂离子电池（LIBS）中的石墨阳极的有效固体电解质相互作用（SEI）形成添加剂。 TMSP通过TMSP与未经化分解的碳酸亚碳酸亚乙酯（EC）阴离子之间的化学反应形成SEI层，其与集合添加剂的广泛已知机制尖锐地不同。 TMSP在阴极偏振下是稳定的，但它与衍生自碳酸酯溶剂的电化学还原的自由基阴离子中间体进行化学反应以产生稳定的SEI层。这些TMSP衍生的SEI层改善了石墨阳极的界面稳定性;导致保留96.8％，高的库仑效率为95.2％。我们建议使用TMSP作为功能添加剂，有效地稳定锂离子电池中阳极和阴极的固体电解质界面。

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