Towards Fire-Safe Polymer Electrolytes for Lithium-Ion Batteries: Strategies for Electrolyte Design and Structural...

Area of Science:

• Materials Science
• Electrochemistry
• Battery Technology

Background:

• Lithium-ion batteries (LIBs) face safety risks from flammable liquid electrolytes.
• Polymer electrolytes offer improved thermal stability but can still pose fire hazards.
• Enhancing flame retardancy is key to unlocking the full potential of polymer electrolytes.

Purpose of the Study:

• To review recent advancements in improving the flame retardancy of polymer electrolytes.
• To evaluate various strategies for enhancing flame retardancy and their impact on battery performance.
• To provide insights for developing safer, high-performance lithium batteries.

Main Methods:

• Incorporation of flame-retardant additives into polymer matrices.
• Addition of nanoscale fillers to enhance thermal resistance.
• Design of layered or hybrid polymer membrane structures as thermal barriers.

Main Results:

• Various strategies effectively enhance the flame retardancy of polymer electrolytes.
• Flame retardancy improvements must be balanced with ionic conductivity and overall battery performance.
• Layered/hybrid structures show promise as effective thermal barriers.

Conclusions:

• Significant progress has been made in enhancing the safety of polymer electrolytes.
• Further research is needed to address enduring safety challenges in solid-state batteries.
• Developing intrinsically flame-retardant polymer electrolytes is essential for next-generation lithium batteries.