Battery SEI Layer Growth & Capacity Fade Calculator

Compute Solid Electrolyte Interphase (SEI) parabolic growth, loss of active lithium inventory (LLI), calendar capacity degradation, and Arrhenius temperature acceleration.

Cell Chemistry & Operating Conditions

Initial Cell Capacity Q₀ (Ah):

Calendar Age t (years):

Average Storage Temp T (°C): Degradation accelerates above 25°C

Average Storage State of Charge: High SOC swells anode potential

Anode Material Formulation:

Capacity Fade & State of Health (SOH)

Remaining State of Health (SOH)

Lost Lithium Inventory (LLI)

SEI Thickness δ_sei

Arrhenius Accel.

Internal Res. ΔR_int

Degradation Kinetic Model

Parabolic calendar law: ΔQ ~ A · exp(-Ea/RT) · SOC^α · t^0.5

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Battery SEI Layer Growth & Capacity Fade Calculator

Cell Chemistry & Operating Conditions

Capacity Fade & State of Health (SOH)

Frequently Asked Questions