Aging mechanism

Example

Use in Lemonergy

Separate mechanisms, observations and fitted models.

This is a reference concept. No executable Lemonergy block has been verified for this term.

Learn it in Lesson 4 · Battery aging →

Connected concepts

Related concepts from the knowledge graph. Connections show context, not cause and effect. Hover or focus a linked term for its definition.

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.

Impedance rise

An increase in a cell’s internal resistance as it ages. It costs voltage under load and therefore power, even while the stored charge is still there.

Loss of active material

The degradation mode in which electrode material becomes unable to store lithium: particles crack and lose electronic contact, structures collapse, or transition metals dissolve. It is tracked separately for each electrode.

Loss of lithium inventory

The degradation mode in which cyclable lithium is consumed by side reactions — SEI growth, plating, electrolyte decomposition — and can no longer shuttle between the electrodes. It is the dominant cause of capacity fade in most lithium-ion cells.

References & further reading

Technical references

1. Lithium ion battery degradation: what you need to know

   Physical Chemistry Chemical Physics · 2021

   Technical reference · Degradation mechanisms, modes, operational effects and their interactions.