Characteristics of ejected particles from 18650 lithium-ion batteries based on lithium cobalt oxide/lithium nickel oxide system during thermal runaway caused by nail penetration
An experimental study on acupuncture abuse of cylindrical 18650 lithium-ion batteries with lithium cobalt/nickelate system was carried out under full charge state to reveal the characteristics of lithium-ion battery ejected particles during thermal runaway.The ejected particles were collected and divided into 4 samples according to the ejected particle size ranges of 0～0.1,0.10～0.25,0.25～0.5 and>0.5 mm.The mass,morphology,particle size and elemental composition of the particles were characterized and analyzed.The results show that the mass loss of the battery is 40.22%after thermal runaway,and the ejected particles accounts for 40.64%of the mass loss.The ejected particles with the particle size range of 0～0.1mm are mainly spherical or irregular black solid powder with rough surface and cracks.The cumulative volume percentages of ejected particles of 10%,50%and 90%correspond to the particle diameters of 15.659,131.457 and 481.643 μm,respectively.The main metal elements in the ejected particles are nickel,aluminum,cobalt,copper and lithium,accounting for 49.98%of the total element content.This study provides a reference for revealing the formation mechanism and reasonable disposal of ejected particles in cylindrical 18650 lithium-ion battery.
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