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Atomic Layer Deposited Silicon Anode with Nanoporous Fluorinated Surface Modulation Enabling Invertible
Jiabin Fang1, Kang Wu1, Lijun Qin1
1Laboratory of Material Surface Engineering and Nanofabrication, Science and Technology on Combustion and Explosion Laboratory, Xi'an Modern Chemistry Research Institute, Xi'an, 710065, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|July 9, 2025
Summary
This study developed a novel silicon anode using atomic layer deposition for improved battery performance. The new design enhances energy density and stability, overcoming key limitations in silicon anodes for longer-lasting batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Silicon anodes offer high theoretical capacity but suffer from poor cycling stability due to volume expansion and interfacial instability.
- Existing silicon anode designs struggle to balance energy density with long-term performance.
Purpose of the Study:
- To engineer a stable and high-energy-density silicon anode using advanced deposition techniques.
- To address the challenges of volume expansion and interfacial degradation in silicon anodes.
Main Methods:
- Atomic/molecular layer deposition was employed to synthesize silicon (Si) on carbon black (CB@Si) and subsequently coat with nanoporous fluorinated lithicone (LiFHQ).
- Precise control over silicon thickness (optimized at 13.6 nm) and LiFHQ pore structure was achieved.
- Molecular dynamics (MD) simulations were used to analyze Li+ ion transport.
Main Results:
- The CB@Si anode with a LiFHQ coating demonstrated excellent capacity retention (70.2% at 2 A g⁻¹ after 1000 cycles).
- The nanoporous LiFHQ layer effectively buffered silicon volume expansion and facilitated the formation of a stable LiF-rich solid electrolyte interphase (SEI).
- MD simulations confirmed enhanced Li+ permeation through the porous LiFHQ structure.
Conclusions:
- Atomic and molecular layer deposition strategies are effective for creating advanced silicon anodes with tailored bulk and surface properties.
- The developed anode design significantly improves cycling stability and energy density for next-generation batteries.
- This approach offers a promising pathway for overcoming critical limitations in silicon anode technology.
