BM10: Bioinspired Interfacial Materials with Superwettability
BM09: Stretchable Bioelectronics—From Sensor Skins to Implants and Soft Robots

ES05: Materials and Design for Resilient Energy Storage

Aashutosh Mistry, Purdue University

Thermal Cross-Talk in Lithium-Ion Battery Safety

Written by Hortense Le Ferrand

Lithium batteries typically heat during their use, due to electrochemical operation. If the heat generated is not dissipated properly, the temperature rises to unsafe levels and may trigger an uncontrolled heating of the batteries, usually terminating into degradation.

Aashutosh Mistry and his co-workers are modeling this phenomenon based on microscopic experimental characterization, revealing the correlation between the electrode microstructures and the heat rates generated. Indeed, the electrodes, both anode and cathode, of the battery are composed of a multiple phase microstructure enabling the transport of lithium, with graphite flakes dispersed in polyvinylidiene fluoride (Teflon) for the anode and nickel-manganese-cobalt (NMC) oxide spherical particles in another polymer for the cathode. During operation, heat, mass, and charge transfers occur so that the changes in the porosity and tortuosity in the microstructure at one electrode strongly affect the electronic conductivity of the other.

Their predictions also highlight the difference in thermal response during charging and discharging. A key conclusion of their study is the existence of closely coupled interactions between anode and cathode for electrochemical performance, thermal response, and chemical degradation. This suggests that each of these phenomena cannot be completely studied in an independent isolated test, and a holistic description is necessary.

Comments

Verify your Comment

Previewing your Comment

This is only a preview. Your comment has not yet been posted.

Working...
Your comment could not be posted. Error type:
Your comment has been posted. Post another comment

The letters and numbers you entered did not match the image. Please try again.

As a final step before posting your comment, enter the letters and numbers you see in the image below. This prevents automated programs from posting comments.

Having trouble reading this image? View an alternate.

Working...

Post a comment

Your Information

(Name and email address are required. Email address will not be displayed with the comment.)