Comprehensive battery safety risk evaluation : aged cells versus fresh cells upon mechanical abusive triggering

Search for this publication on Google Scholar
Xu, J., Ma, L., Gao, X., & Jia, Y. (2023). Comprehensive battery safety risk evaluation : aged cells versus fresh cells upon mechanical abusive triggering. Advanced Energy Materials. https://doi.org/doi:10.1002/aenm.202300368
Download PDF

Analytics

29 views ◎
1 downloads ⇓


Description

Faculty, Despite their wide applications, lithium-ion batteries (LIBs) have been struggling with their safety risks arising from different lifetime stages. Here, the NCMA pouch cell is taken as an example, and the safety of both fresh and aged cells from three milestone stages, that is, internal short circuit (ISC) triggering risk, ISC mode, and the subsequent thermal runaway (TR) consequence is investigated. By combining mechanical abusive testing and physics-based models on commercialized cells with various states-of-health (SOH) and states-of-charge, it is discovered that the ISC triggering delays with the decay of SOH and soft ISC mode will be triggered more frequently, which is mainly due to the mechanical behaviors of the current collectors. The temperature rises and peak temperature during the subsequent TR also become milder for aged cells due to the reduced capacity and deterministic soft ISC process. Results here provide a mechanistic explanation of the safety risk comparison between the fresh and aged cells, offering cornerstone guidance to the evaluation and design of next-generation safer LIBs.

Details
Title

Comprehensive battery safety risk evaluation : aged cells versus fresh cells upon mechanical abusive triggering

Author(s)

Xu, Jun
Ma, Lin
Gao, Xiang
Jia, Yikai

UNC Charlotte Affiliate Type

Faculty

Extent

1 online resource

Date Created

2023

Genre

articles

Resource Type

text

Abstract

Despite their wide applications, lithium-ion batteries (LIBs) have been struggling with their safety risks arising from different lifetime stages. Here, the NCMA pouch cell is taken as an example, and the safety of both fresh and aged cells from three milestone stages, that is, internal short circuit (ISC) triggering risk, ISC mode, and the subsequent thermal runaway (TR) consequence is investigated. By combining mechanical abusive testing and physics-based models on commercialized cells with various states-of-health (SOH) and states-of-charge, it is discovered that the ISC triggering delays with the decay of SOH and soft ISC mode will be triggered more frequently, which is mainly due to the mechanical behaviors of the current collectors. The temperature rises and peak temperature during the subsequent TR also become milder for aged cells due to the reduced capacity and deterministic soft ISC process. Results here provide a mechanistic explanation of the safety risk comparison between the fresh and aged cells, offering cornerstone guidance to the evaluation and design of next-generation safer LIBs.

Subjects--Topics

Materials
Lithium ion batteries

Is Part Of

Advanced energy materials

Language

English

Published Version (Please cite this version)

doi:10.1002/aenm.202300368

Publisher's Version

https://doi.org/10.1002/aenm.202300368

Rights

This item may be protected by copyright and other related rights. Atkins Library provides access to this item for educational and research purposes only; other uses require the permission of the copyright holder.