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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Silicon dioxide (SiO2)-graphite composite anodes are investigated for high specific capacity in lithium-ion batteries.
  • Efficient binders are crucial for maintaining the electronic and mechanical integrity of these composite anodes.

Purpose of the Study:

  • To compare the performance of water-soluble styrene butadiene rubber (SBR) and polyacrylic acid (PAA) binders in a 15% SiO2-graphite composite anode.
  • To evaluate binder effects on electrode properties, electrochemical performance, and practical battery applications.

Main Methods:

  • Fabrication of SiO2-graphite composite anode electrodes using SBR and PAA binders.
  • Measurement of peeling strength, first coulombic efficiency, and discharge specific capacity.
  • Electrochemical impedance spectroscopy (EIS) and rate performance testing.
  • Evaluation in half-cell (coin) and high-voltage pouch battery configurations.

Main Results:

  • SBR binder yielded a first coulombic efficiency of 83.6% and a discharge specific capacity of 626.5 mA h g⁻¹, while PAA binder achieved 81.2% and 636.1 mA h g⁻¹.
  • SBR binder showed better electron and ion transfer, indicated by EIS and rate performance.
  • PAA binder resulted in lower swelling (7.49% vs. 9.56%) and better cycle performance in high-voltage pouch batteries at the 450th cycle.

Conclusions:

  • While SBR binder facilitates charge transfer, PAA binder offers improved stability and cycle life in practical high-voltage lithium-ion battery applications.
  • The choice of binder significantly impacts the performance and durability of SiO2-graphite composite anodes.