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Tris(trimethylsilyl) Phosphite as an Efficient Electrolyte Additive To Improve the Surface Stability of Graphite Anodes
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-09-18 00:00:00 , DOI: 10.1021/acsami.7b11309
Taeeun Yim 1 , Young-Kyu Han 2
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-09-18 00:00:00 , DOI: 10.1021/acsami.7b11309
Taeeun Yim 1 , Young-Kyu Han 2
Affiliation
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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 SEI-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.
中文翻译：
三（三甲基甲硅烷基）亚磷酸酯作为一种有效的电解质添加剂，可改善石墨阳极的表面稳定性
亚磷酸三（三甲基甲硅烷基）酯（TMSP）作为锂离子电池中各种正极材料的功能添加剂受到了广泛的关注，但是尚未研究TMSP对石墨阳极表面稳定性的影响。在本文中，我们证明TMSP可以作为锂离子电池（LIBs）中石墨阳极的有效形成固态电解质相间（SEI）的添加剂。TMSP通过TMSP与还原分解的碳酸亚乙酯（EC）阴离子之间的化学反应形成SEI层，这与SEI形成添加剂的广为人知的机理显着不同。TMSP在阴极极化下是稳定的，但它与源自碳酸盐溶剂的电化学还原的自由基阴离子中间体发生化学反应，以生成稳定的SEI层。这些源自TMSP的SEI层改善了石墨阳极的界面稳定性，从而保留了96.8％的碳和95.2％的高库仑效率。我们建议使用TMSP作为功能性添加剂，以有效地稳定锂离子电池阳极和阴极的固体电解质界面。
更新日期：2017-09-19
中文翻译：
三（三甲基甲硅烷基）亚磷酸酯作为一种有效的电解质添加剂，可改善石墨阳极的表面稳定性
亚磷酸三（三甲基甲硅烷基）酯（TMSP）作为锂离子电池中各种正极材料的功能添加剂受到了广泛的关注，但是尚未研究TMSP对石墨阳极表面稳定性的影响。在本文中，我们证明TMSP可以作为锂离子电池（LIBs）中石墨阳极的有效形成固态电解质相间（SEI）的添加剂。TMSP通过TMSP与还原分解的碳酸亚乙酯（EC）阴离子之间的化学反应形成SEI层，这与SEI形成添加剂的广为人知的机理显着不同。TMSP在阴极极化下是稳定的，但它与源自碳酸盐溶剂的电化学还原的自由基阴离子中间体发生化学反应，以生成稳定的SEI层。这些源自TMSP的SEI层改善了石墨阳极的界面稳定性，从而保留了96.8％的碳和95.2％的高库仑效率。我们建议使用TMSP作为功能性添加剂，以有效地稳定锂离子电池阳极和阴极的固体电解质界面。
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