High-Voltage-Resistant Highly Stable Solid Polymer Electrolyte via In Situ Integrated Construction with Fast Ion...

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Chemistry

Background:

• Electric aviation demands high-energy-density batteries, currently limited by lithium battery technology.
• Existing battery technologies face challenges in meeting the stringent requirements for electric aircraft and vehicles.

Purpose of the Study:

• To design and fabricate a high-voltage-resistant solid polymer electrolyte (HVPE) for advanced battery applications.
• To improve Li+ ion conductivity and electrochemical stability for high-energy-density solid-state batteries.

Main Methods:

• Molecular structure design of polymer electrolytes to create fast migration channels.
• In situ polymerization technique to fabricate the high-voltage-resistant solid polymer electrolyte (HVPE).
• Electrochemical characterization, including Li+ transfer number and electrochemical window measurements.

Main Results:

• The developed HVPE demonstrated an ultrahigh Li+ transfer number (tLi+) of 0.92 and an electrochemical window of 5.1 V.
• Stable lithium plating and stripping were achieved for over 1000 hours, indicating excellent interfacial stability.
• The LCO|HVPE|Li cell showed stable cycling for 500 cycles at 4.5 V with 89.93% capacity retention.

Conclusions:

• The proposed HVPE offers a promising solution for high-voltage solid-state polymer batteries.
• This work provides new insights into structural design strategies for enhancing energy density in solid-state batteries.
• The developed electrolyte is suitable for demanding applications like electric aviation.