Converting CO₂ into functionally valuable materials: a hybrid polymer electrolyte for high-performance lithium metal...

Area of Science:

• Materials Science
• Electrochemistry
• Sustainable Energy

Background:

• Upcycling carbon dioxide (CO2) into battery components offers a path to carbon-neutral energy storage.
• Existing CO2-derived polymers often require harsh synthesis conditions and exhibit limited electrochemical integration.
• Developing efficient and stable electrolytes is crucial for advancing next-generation batteries.

Purpose of the Study:

• To develop a novel hybrid polymer electrolyte using CO2 as a feedstock for carbon-neutral energy storage.
• To enhance the electrochemical performance and stability of lithium metal batteries through a unique electrolyte design.
• To demonstrate the viability of CO2-derived materials in practical battery applications.

Main Methods:

• Synthesis of a CO2-derived polyurethane (PCO2) under ambient conditions.
• Construction of a composite electrolyte (GPCO2-2) by integrating PCO2 with a polymer matrix and a deep eutectic solvent.
• In situ densification and interfacial reconstruction for mechanical and electrochemical stability.
• Investigation of ion transport mechanisms and solid-electrolyte interphase formation.

Main Results:

• The GPCO2-2 electrolyte exhibits excellent mechanical integrity and electrochemical stability.
• A competitive coordination mechanism facilitates efficient Li+ transport and suppresses excessive binding.
• Lithium metal cycling stability exceeds 2500 hours.
• Li/GPCO2-2/NCM811 batteries demonstrate stable cycling at high voltages (4.3 V and 4.7 V).
• Flexible pouch cells show 71.1% capacity retention after 100 cycles.
• Enhanced safety features observed during overcharge tests due to regulated Li+ transport.

Conclusions:

• The developed hybrid polymer electrolyte from upcycled CO2 offers a promising solution for sustainable and high-performance energy storage.
• Ambient synthesis conditions and effective interfacial engineering contribute to superior electrochemical properties.
• The GPCO2-2 electrolyte enables reliable and safe operation of lithium metal batteries, paving the way for carbon-neutral energy solutions.