Crack Formation in EV Battery Electrodes Unraveled: UT Austin
Octobewr 11, 2023 — Battery experts at The University of Texas at Austin have shed new light on a critical issue facing battery components commonly used in electric vehicles.
Over time, particles that make up nickel-based cathodes in these batteries tend to crack, limiting the life cycle of the battery and raising safety issues. The prevailing theory saw this as an inevitable problem caused by the natural expansion and contraction of the particles that occurred during the battery’s natural process for delivering power.
But, in a newarticle published recently in Joule, the UT team found that unstable electrolytes – the material that serves as the transport medium for ions in the battery reaction – and their high level of reactivity with the cathode are the culprit of this phenomenon.
“We found that the electrolyte reacting with the cathode surface leads to the increased crack formation,” said Arumugam Manthiram, a professor in the Walker Department of Mechanical Engineering who led the research. “Unfortunately, the whole field has been misled…
By Alex Mills