K02Knowledge concept
SEI and CEI
How interphases affect life and safety.
Concept visualIon migration
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How interphases affect life and safety.
Section 01
When electrode potential enters certain ranges, electrolyte components can reduce or oxidize and form surface products. If a layer limits ongoing side reactions while preserving ion transport it may stabilize the cell; if it repeatedly cracks or thickens, it consumes active material and sodium inventory.
—Formation consumes part of sodium inventory
—The layer must allow ion movement
—The layer must suppress ongoing side reactions
Section 02
The same electrode can form different interphases with different salts, solvents, additives, compaction, and temperature. Attributing stability to one additive or one material ignores electrode surface, trace water, and formation procedure acting together.
—Electrode surface affects reaction onset
—Electrolyte determines reactive components
—Formation strategy affects interphase evolution
Section 03
Impedance rise, lower initial efficiency, or fading can involve interphases, yet may also stem from structural damage, contact loss, or test bias. Diagnose with electrochemical curves, impedance, post-mortem characterization, and controls rather than one peak or one micrograph.
—Use controls and replicates
—Retain formation and cycling conditions
—Separate correlation from causation
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