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Electrodeposition01:08

Electrodeposition

761
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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High performance silicon electrode enabled by titanicone coating.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Silicon (Si) anodes offer high theoretical capacity for lithium-ion batteries (LIBs) but suffer from poor cycling stability and volume expansion.
  • Developing effective coatings is crucial to mitigate Si degradation and improve electrochemical performance.
  • Titanicone (TiGL) is explored as a protective layer for nano Si anodes.

Purpose of the Study:

  • To investigate the electrochemical performance of nano Si electrodes coated with titanicone (TiGL) using Atomic Layer Deposition (ALD) and Molecular Layer Deposition (MLD).
  • To evaluate the impact of ALD/MLD coating temperature on electrode performance.
  • To demonstrate the enhanced lithium-ion kinetics and electrochemical stability of the coated Si anodes.

Main Methods:

  • Fabrication of nano Si electrodes coated with TiGL using a combined ALD/MLD process at various temperatures.
  • Electrochemical characterization including galvanostatic cycling, rate capability tests, and long-term cycling stability.
  • Electrochemical impedance spectroscopy (EIS) and conductivity measurements to analyze lithium-ion kinetics and electronic conductivity.

Main Results:

  • Electrodes coated at 150 °C exhibited the highest capacity (1800 mAh g⁻¹ at 0.1 C) and superior rate performance (150 mAh g⁻¹ at 20 C) compared to uncoated Si.
  • The optimized TiGL-coated electrode maintained 1200 mAh g⁻¹ at 1 C for 350 cycles with 93% capacity retention.
  • ALD/MLD coating enhanced lithium kinetics, electronic conductivity, stabilized the solid electrolyte interphase (SEI) formation, and improved Coulombic efficiency.

Conclusions:

  • The TiGL coating deposited via ALD/MLD significantly improves the electrochemical performance and cycling stability of nano Si anodes for LIBs.
  • The optimized coating enhances electrode kinetics and structural integrity, addressing key challenges in Si-based battery technology.
  • This coating strategy offers a promising pathway for developing high-performance and durable next-generation lithium-ion batteries.