Tris(trimethylsilyl) Phosphite as an Efficient Electrolyte Additive to Improve the Surface Stability of Graphite Anodes

Taeeun Yim, Young Kyu Han

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)32851-32858
Number of pages8
JournalACS Applied Materials and Interfaces
Volume9
Issue number38
DOIs
StatePublished - 27 Sep 2017

Keywords

  • additive
  • graphite
  • lithium-ion battery
  • phosphite
  • solid electrolyte interphase

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