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Limiting Internal Short-circuit Damage by Electrode Partition for Impact-tolerant Li-ion Batteries

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155 to 167

Herein, we report on a new safety mechanism introduced to Li-ion battery to mitigate mechanical impact by limiting the current going through the internal short to small values preventing thermal runaway. This was achieved by electrically isolating the impacted parts before puncturing the separator. The isolation took places along slits that were introduced in the electrodes and current collector. Batteries with slitted electrodes showed no difference in their electrochemical performance compared to standard one. A proof of concept experiment was conducted, and the battery with modified electrodes survived significant mechanical deformation without being shorted. After the event, the modified battery was still viable with a reversible capacity of about 93% of that before the indentation test, while the standard one was dead.