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In Situ Lithiated Reference Electrode: Four Electrode Design for In-operando Impedance Spectroscopy
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Electrolyte Design for Simultaneous Interfacial Stabilization in Si||NCM811 Full Cells.

Seo Yun Jang1, Kyu Hong Lee1,2, Juhyoung Kim1,3

  • 1Advanced Battery Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon, Republic of Korea.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|June 9, 2026
PubMed
Summary
This summary is machine-generated.

A new electrolyte additive strategy stabilizes silicon anodes and nickel-rich cathodes in high-energy lithium-ion batteries. This dual-additive approach enhances cycling stability and durability for advanced battery applications.

Keywords:
NCM811 cathodesSEI/CEI engineeringSilicon anodesinterfacial stabilityliquid electrolyteslithium‐ion full cells

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • High-energy lithium-ion batteries utilize silicon anodes and nickel-rich cathodes (e.g., NCM811) for increased energy density.
  • These combinations face interfacial instabilities, including silicon anode SEI disruption and NCM811 cathode degradation, limiting cycle life.
  • Electrolyte-derived side reactions exacerbate these issues, leading to gas evolution and performance fade.

Purpose of the Study:

  • To develop a dual-additive electrolyte to simultaneously stabilize silicon anode and NCM811 cathode interfaces.
  • To investigate the synergistic effects of fluoroethylene carbonate (FEC) and dimethoxydimethylsilane (DMDMS) on interfacial stability.
  • To enhance the cycling performance and durability of high-energy Si||NCM lithium-ion batteries.

Main Methods:

  • Formulation of a dual-additive electrolyte with FEC and DMDMS.
  • Electrochemical cycling of Si-Fe alloy anode || NCM811 full cells.
  • Analysis of interfacial properties, including SEI formation, gas evolution, impedance, and electrode swelling.

Main Results:

  • The dual-additive electrolyte effectively stabilized the solid electrolyte interphase (SEI) on the silicon anode with LiF.
  • DMDMS suppressed acid-driven degradation by scavenging HF and stabilizing PF5, mitigating NCM811 surface issues.
  • Reduced gas evolution, interfacial impedance growth, and electrode swelling were observed.
  • Si||NCM811 full cells achieved an initial discharge capacity of 167.8 mAh g⁻¹ and retained 65.5% after 150 cycles, with improved rate capability.

Conclusions:

  • The synergistic dual-additive electrolyte design effectively addresses interfacial instabilities in Si||NCM811 batteries.
  • This strategy significantly enhances the cycling durability and rate performance of high-energy lithium-ion batteries.
  • The findings present a promising approach for developing next-generation energy storage solutions.