It's All About the Delta (and Temperature, but the BMS will Protect You) -- Test: Effect of temperature on battery cells life

[chl]

Glad to hear it, but I kind of already expected that based on my experience with my 2012 Nissan Leaf which still has about 80% capacity after 13 years of light use, no 100% charging, no fast charging.

From the Nature article:
Conclusions
We have pinpointed strong correlations between dynamic discharge profiles and battery ageing under non-accelerated conditions. We found that constant current is not representative of ageing under real EV driving and dynamic cycling enhances battery lifetime. In addition, time-induced ageing becomes dominant over cycling ageing, even at EV-relevant C-rates (≤0.4C). Furthermore, leveraging the diversity of our dynamic discharge profiles, we evidenced that low-frequency pulses, discharge current peaks and time-induced ageing, all characteristic of real EV usage behaviour, play a decisive role in degradation trajectories.

This work shows that cycling experiments need to be carried out with realistic loads to capture degradation trends. The present dataset can be used to develop models to map degradation induced by constant current to degradation induced by dynamic cycling. There is a need to systematically adopt realistic cycling protocols when developing new battery materials and cell designs, not only in terms of optimization but also in terms of mechanistic understanding. Beyond battery research, this work illustrates the opportunities to use realistic testing to deepen our understanding of material and device ageing in physical sciences.

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