Citation

BibTex format

@article{Tomaszewska:2022:10.1149/ma2022-012186mtgabs,
author = {Tomaszewska, A and Doel, R and Parkes, M and Offer, GJ and Wu, B},
doi = {10.1149/ma2022-012186mtgabs},
journal = {ECS Meeting Abstracts},
pages = {186--186},
title = {Investigating Li Plating Distribution Caused By a Thermal Gradient through Modelling, Differential Voltage, and Post-Mortem Analysis},
url = {http://dx.doi.org/10.1149/ma2022-012186mtgabs},
volume = {MA2022-01},
year = {2022}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - <jats:p> Relatively slow charging speeds are often quoted as a key barrier to customer acceptance of EVs. Currently, the charging rates are limited primarily by the risk of lithium plating. While traditionally lithium plating has been associated with low temperature charging, recent reports point to the fact that thermal heterogeneity can significantly affect the plating behaviour, sometimes making it more likely or accelerated in the warmer regions in a cell [1][2]. In EVs, through-plane thermal gradients often develop across individual pouch cells due to the widespread use of surface cooling, particularly during fast charging, when the heat generation rates are also increased. This work investigates the effects of such through-plane thermal gradients on the lithium plating behaviour using a multilayer 2D electrochemical-thermal model and high-rate cycling experiments. The results show that the thermal gradient can result in preferential plating in either the colder or warmer cell regions, depending on the average cell temperature and the activation energies of solid diffusion and lithium plating. While the diffusion rates are slower in the colder cell layers, warmer ones attract higher currents and either of these effects may dominate the plating behaviour. The experimental validation consists of differential voltage analysis, post-mortem visual examination and measurement of remaining capacity in coin cells harvested from Li-ion cells fast charged under uniform temperatures and under thermal gradients. The limitations of DVA as a technique to quantify lithium plating are highlighted. These stem from the fact that the quantification technique requires assuming that only lithium stripping and no de-intercalation takes place up to the differential voltage minimum. In reality, the current is divided between both reactions, and both the temperature and concentration of the metallic lithium may affect the rate of stripping, shifting the location of the minimum
AU - Tomaszewska,A
AU - Doel,R
AU - Parkes,M
AU - Offer,GJ
AU - Wu,B
DO - 10.1149/ma2022-012186mtgabs
EP - 186
PY - 2022///
SP - 186
TI - Investigating Li Plating Distribution Caused By a Thermal Gradient through Modelling, Differential Voltage, and Post-Mortem Analysis
T2 - ECS Meeting Abstracts
UR - http://dx.doi.org/10.1149/ma2022-012186mtgabs
VL - MA2022-01
ER -