Porous covalent organic frameworks for high transference number polymer-based electrolytes

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Chemistry

Background:

• Solid-state batteries are crucial for next-generation energy storage.
• Low lithium-ion (Li+) transference numbers in polymer electrolytes hinder their practical application.
• Developing advanced electrolytes is key to overcoming these limitations.

Purpose of the Study:

• To enhance the Li+ transference number of polymer electrolytes.
• To improve the performance of solid-state batteries using functional additives.
• To explore the application of porous organic materials in energy storage.

Main Methods:

• Synthesis of porous boron-containing covalent organic frameworks (COFs) with varying surface areas.
• Incorporation of COF additives into polymer electrolytes.
• Characterization of Li+ transference number and electrochemical performance.
• Assembly and testing of solid-state battery cells.

Main Results:

• Boron-containing COFs effectively adsorb lithium salt anions, significantly increasing the Li+ transference number.
• Polymer electrolytes with COF additives demonstrated improved ionic conductivity.
• Solid-state cells using COF-containing electrolytes showed reduced overpotentials and enhanced rate performance.

Conclusions:

• Porous boron-containing COFs are effective functional additives for enhancing polymer electrolyte performance.
• The strong anion adsorption by COFs is crucial for improving Li+ transference.
• This work presents a promising strategy for developing high-performance solid-state batteries using porous organic materials.