Deciphering the Effect of Microstructural Modification in Sodium Alginate-Based Solid Polymer Electrolyte by Unlike...

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Science

Background:

• Sodium alginate (NaAlg)-based solid polymer electrolytes are crucial for energy storage.
• Understanding anion influence on electrolyte microstructure is key for optimizing performance.

Purpose of the Study:

• To investigate the microstructure modification of NaAlg-based solid polymer electrolytes.
• To compare the effects of perchlorate (ClO₄^-) and acetate (CH₃COO^-) anions on electrolyte properties.

Main Methods:

• X-ray diffraction (XRD) studies to analyze structural changes.
• Differential scanning calorimetry (DSC) to determine glass transition temperature (T_g).
• Scanning electron microscopy (SEM) to observe surface morphology.
• Mechanical property testing.

Main Results:

• ClO₄^- acts as a structure breaker, while CH₃COO^- alters the amorphous phase.
• Larger ClO₄^- exhibits a plasticizing effect, lowering T_g compared to CH₃COO^-.
• Anion type significantly impacts decomposition temperature and surface morphology.
• NaAlg-NaClO₄ systems show superior mechanical properties over NaAlg-CH₃ COONa systems.

Conclusions:

• Anion characteristics, including size and charge delocalization, play a critical role in solid polymer electrolyte properties.
• These findings are relevant for developing advanced sodium ion-based electrolytes for energy storage applications.