Battery knowledge · Aging and degradation
Aging
The gradual, irreversible change in a cell’s capacity, resistance and safety margins over time and use. It is the sum of many chemical and mechanical mechanisms, each driven by temperature, state of charge, current and cycle depth. [1]
- Also called
- degradation
Example
Diffusion-limited film growth
At four reference time units, thickness is 2× the reference thickness.
Normalized analytical relation, not a capacity-loss or SOH prediction.
Explore the graph
Four times the elapsed time gives twice the film thickness in this model.
At four reference time units, thickness is 2× the reference thickness.
δ / δ_ref = √[(t / t_ref) A]
Illustrative model. Normalized analytical relation, not a capacity-loss or SOH prediction.
Use in Lemonergy
Separate mechanisms, observations and fitted models.
This is a reference concept. No executable Lemonergy block has been verified for this term.
References & further reading
Technical references
- Lithium ion battery degradation: what you need to know
Physical Chemistry Chemical Physics · 2021
Technical reference · Degradation mechanisms, modes, operational effects and their interactions.