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    Mitigating thermal runaway of lithium-ion battery through electrolyte displacement

    Year: 2017

    Journal: Appl. Phys. Lett., Volume 110, FEB 6

    Authors: Shi, Yang; Noelle, Daniel J.; Wang, Meng; Le, Anh V.; Yoon, Hyojung; Zhang, Minghao; Meng, Ying Shirley; Fan, Jiang; Wu, Dengguo; Qiao, Yu

    Organizations: Advanced Research Projects Agency - Energy (ARPA-E) [DE-AR0000396]

    Alkanes are investigated as thermal-runaway retardants (TRR) for lithium-ion battery (LIB). TRR is a chemical that can rapidly terminate exothermic reactions in LIB. Under normal working conditions, TRR is sealed in separate packages in the LIB cell, and upon mechanical abuse, it is released to suppress heat generation. The alkanes under investigation include octane, pentadecane, and icosane, among which pentadecane has the highest thermal-runaway mitigation (TRM) efficiency. In nail penetration test on coin cells, similar to 4wt. % pentadecane reduced the maximum temperature by similar to 60%; in impact test on pouch cells, similar to 5wt. % pentadecane reduced the maximum temperature by similar to 90%. The high TRM efficiency of pentadecane is attributed to its high wettability to separator and its immiscibility with electrolyte. By forming a physical barrier between the cathode and anode, pentadecane interrupts lithium ion (Li+) transport and increases the charge transfer resistance by nearly two orders of magnitude. The diffusion rate of pentadecane in the electrode layer stack was measured to be similar to 580 mu m/s. Published by AIP Publishing.
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