Three-Dimensional Rigidity-Reinforced SiO Anodes with Stabilized Performance Using an Aqueous Multicomponent Binder...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Silicon oxide (SiO) anodes offer high theoretical capacity for lithium-ion batteries but suffer from significant volume expansion during cycling, leading to performance degradation.
• Developing stable anode materials is crucial for advancing next-generation energy storage solutions.
• Existing binders often fail to mitigate the mechanical stresses associated with silicon anode volume changes.

Purpose of the Study:

• To design and synthesize a 3D rigidity-reinforced SiO anode using aqueous multicomponent binders.
• To stabilize the electrochemical performance of SiO anodes by addressing the volume expansion issue.
• To investigate the synergistic effects of different binder components on anode structural integrity and electrochemical properties.

Main Methods:

• Preparation of SiO anodes utilizing four types of aqueous multicomponent binders: polyacrylamide (PAM), poly(tetrafluoroethylene) (PTFE), carboxymethyl cellulose, and styrene butadiene rubber (SBR).
• Characterization of the structural, adhesive, and electrolyte absorption properties of the prepared anodes.
• Evaluation of the electrochemical performance, including cycling stability and rate capability, of the SiO anodes with different binder formulations.

Main Results:

• The SiO anode with the PAM/SBR/PTFE (PSP) binder exhibited a 3D rigidity-reinforced structure, enhanced adhesive force, and optimized electrolyte adsorption.
• The PSP663 binder formulation significantly stabilized electrochemical performance, achieving a retention capacity of 770 mAh g^-1 at 500 mA g^-1 after 300 cycles.
• A high rate capacity of 993 mAh g^-1 at 1200 mA g^-1 was recorded, demonstrating excellent rate performance.
• PTFE provided chemical stability against electrolyte corrosion, SBR ensured strong adhesion and structural support, and PAM effectively limited SiO particle expansion.

Conclusions:

• The 3D rigidity-reinforced SiO anode utilizing the aqueous PSP663 binder demonstrates remarkable stability and high electrochemical performance.
• The synergistic combination of PTFE, SBR, and PAM in the binder system effectively addresses the volume expansion challenge in silicon anodes.
• This approach offers a promising strategy for developing high-performance and durable silicon-based anodes for practical lithium-ion battery applications.