Boosting the Cell Performance of the SiO/Cu and SiO/PPy Anodes via In-Situ Reduction/Oxidation Coating Strategies

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Silicon monoxide (SiO) is a promising anode material for lithium-ion batteries due to its high theoretical specific capacity.
• Poor electrical conductivity and irreversible side reactions at the SiO/electrolyte interface limit the cycling stability of SiO anodes.
• Developing effective strategies to improve the performance of SiO anodes is crucial for next-generation energy storage.

Purpose of the Study:

• To overcome the limitations of SiO anodes by developing novel in-situ coating strategies.
• To enhance the electrical conductivity and suppress side reactions of SiO anodes.
• To improve the cycling stability and specific capacity of silicon-based anodes for lithium-ion batteries.

Main Methods:

• In-situ reduction method to create a Cu coating layer on discharged SiO anodes.
• In-situ oxidation method to prepare polypyrrole-coated SiO composites.
• Electrochemical testing to evaluate the cycling stability and specific capacity of the prepared composite anodes.

Main Results:

• The SiO/Cu composite anode exhibited a superior cycling stability of 1206 mAh g^-1 at 0.5 A g^-1 after 200 cycles, compared to pristine SiO (293 mAh g^-1).
• The tight combination of Cu particles and SiO improved conductivity and inhibited side reactions.
• The polypyrrole-coated SiO composite delivered a high reversible specific capacity of 1311 mAh g^-1 at 0.5 A g^-1 after 200 cycles.

Conclusions:

• In-situ coating strategies, such as Cu and polypyrrole coatings, are effective in enhancing the electrochemical performance of SiO anodes.
• These improved SiO anodes offer a new pathway for the development and practical application of high-performance silicon-based anodes.
• The enhanced conductivity and suppressed side reactions contribute to the superior cycling stability and capacity of the modified SiO anodes.