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Boosting Battery Safety by Mitigating Thermal-Induced Crosstalk with a Bi-Continuous Separator

机译：Boosting Battery Safety by Mitigating Thermal-Induced Crosstalk with a Bi-Continuous Separator

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摘要

Lithium-ion batteries are taking center stage in the environmental revolutionthrough the ever-growing adoption of electric vehicles. However, safetyissues derived from battery thermal runaway remain a prominent challenge.In this work, a bi-continuous separator (Bi-Sep) via micro-gravure and phaseinversion techniques is developed. The proposed nonshrinkage separatorexhibits a nanoporous morphology and a super-stretchable property, thuseffectively blocking both internal short circuits and chemical crosstalkbetween electrodes at thermal abusive temperatures. Besides its considerableperformance at normal conditions, the LiNi_(0.6)Co_(0.2)Mn_(0.2)O_2/graphite pouchcell assembled with the Bi-Sep separator presents superior sustainability atan elevated temperature of 60 ℃. Moreover, the cell using this Bi-Sep separatorachieves an extremely high level of survivability under thermal abusiveconditions. This work concludes that engineering the porous structure andthermomechanical properties of a separator, rather than simply improvingits heat-resistance, is of significant importance for the development of safebatteries.

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