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Updated: Jun 11, 2026
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Published on: September 12, 2018
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.
Summary
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.
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.
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