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Improved High Rate and Temperature Stability Using an Anisotropically Aligned Pillar-Type Solid Electrolyte

Hyeon-Woo Yang1, Maniyazagan Munisamy1, Myoung Taek Kwon2

  • 1Department of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul 05006, Republic of Korea.

ACS Applied Materials & Interfaces
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PubMed
Summary

Researchers developed a new solid electrolyte interphase (SEI) using nanodiamond seeds for silicon oxide (SiO2)-based anodes. This innovation significantly enhances lithium-ion battery performance in electric vehicles, especially under demanding conditions.

Keywords:
SiOx-based anodelithium-ion batterynanodiamond-containing electrolytepillar-type morphologysolid electrolyte interphase

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Silicon oxide (SiO2)-based anodes offer high capacity and stability for lithium-ion batteries.
  • Current SiO2 anodes require optimization for electric vehicle (EV) applications, particularly for fast charging and high-temperature performance.

Purpose of the Study:

  • To develop a novel solid electrolyte interphase (SEI) to improve the performance and stability of SiO2-based anodes in EVs.
  • To investigate the effect of nanodiamond seeds in electrolyte on SEI formation and battery performance.

Main Methods:

  • Fabrication of a pillar-type SEI using nanodiamond seeds in the electrolyte.
  • Electrochemical testing of Li||Ti-SiO2@C half-cells and NCM811||Ti-SiO2@C full cells under various conditions (e.g., high current rates, elevated temperatures).
  • Comparative analysis of cells with and without nanodiamond-seeded SEI.

Main Results:

  • The nanodiamond-seeded SEI demonstrated superior cycling stability, retaining 76.4% capacity over 1000 cycles at 5 A g-1 and 50 °C in Li||Ti-SiO2@C cells.
  • Full cells with the pillar-type SEI exhibited 61.8% capacity retention after 500 cycles at 5 C and 50 °C, a significant improvement over conventional SEI (33.3%).
  • Cells without nanodiamond seeds showed a marked capacity decay, retaining only 61.5% capacity under similar conditions.

Conclusions:

  • Nanodiamond-seeded SEI formation is a promising strategy for enhancing the performance and durability of SiO2-based anodes.
  • This approach addresses key limitations for EV battery applications, including fast charging and high-temperature stability.
  • The findings pave the way for developing next-generation high-performance lithium-ion batteries.