China Develops Advanced Battery Insulation Material for EV Safety
Severity: Low (Score: 21.9)
Sources: carnewschina.com, Interestingengineering
Summary
Researchers at Nanjing Tech University have unveiled a new lithium battery insulation material that can withstand temperatures up to 2,372°F (1,300°C). This silica aerogel-based insulation is designed to slow heat transfer during thermal runaway events in lithium-ion batteries, which can lead to fires. Testing showed that a 0.09-inch aerogel sheet exposed to 1,832°F maintained a surface temperature below 212°F, demonstrating significant thermal shielding. The material can sustain thermal isolation for up to two hours, a critical timeframe for safety systems to respond. Previous aerogel solutions only tolerated temperatures up to 572°F, making this advancement crucial for improving battery safety. The aerogel's nanoporous structure, which is 99% air, limits heat conduction, and its mechanical flexibility allows it to withstand the expansion and contraction of battery cells. Production challenges were addressed through an optimized supercritical CO₂ drying process, enhancing efficiency and reducing costs. The new material is expected to be adopted widely in battery systems, aligning with China's strategic focus on advanced materials and new energy. Key Points: • New aerogel insulation withstands temperatures up to 2,372°F, significantly improving EV safety. • Material maintains thermal isolation for up to two hours during thermal runaway events. • Production improvements enable scaling from lab development to industrial use.