![Author ORCID: We display the ORCID iD icon alongside authors names on our website to acknowledge that the ORCiD has been authenticated when entered by the user. To view the users ORCiD record click the icon. [opens in a new tab]](https://chemrxiv.org/engage/assets/public/chemrxiv/images/logos/orcid.png)
Abstract
A transition state theory-influenced ideal model of battery cycle-life is outlined and validated by example of the Panasonic NCR18650B Li-battery cell, which shows after 500 cycles a residual capacity of 68.2 % at 100 % depth of discharge (DoD) as by its datasheet. The ideal model, which bases on a minimum failure causality of one reaction event failing per half-cycle, overstates on the logarithmic scale by just 1.9 % for the conditions given, corresponding to an ideal cycle-life of 563 cycles. Generalization of the model towards DoD-ranges yields for the exemplary (70; 30) % and (100; 60) % margins the cycle-life values of 43252 and 23480, respectively. Because the model relies solely on natural constants, temperature(s) and C-rate(s), the conclusion is drawn that a thermodynamic final regularity similar to Carnot-efficiency governs secondary battery cycle-life; this is in contrast to hitherto academic consensus opinion attesting the matter a basically empiric nature.
Supplementary materials
Title
Exemplary plot of equations 13, 15a and 15b
Description
This graphic illustrates how the distribution function of cycle-life develops from a quadratic approach towards its final form of a negated e-function, in figures of the discussed example.
Actions
