Electron tunneling based SEI formation model

Dongjiang Li

doi:10.1149/06201.0001ecst

Electron tunneling based SEI formation model

2014-11-17

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DOI：10.1149/06201.0001ecst

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A new model, describing the capacity loss of C-6/LiFePO4 batteries under open-circuit storage conditions has been developed. Degradation is attributed to the formation of a Solid Electrolyte Interface (SEI) at the surface of the graphite particles in the negative electrode. The model takes into account that the Solid Electrolyte Interface consists of an inner and outer SEI layer. The rate determining step of the SEI formation process is proposed to be electron tunneling through the inner SEI layer. The simulation results demonstrate that the capacity loss is dependent on the State-of-Charge (SoC), the electrode potential and storage time. The inner SEI layer was found to grow much slower than the outer SEI layer.

Keyword:

LI-ION BATTERIES

SURFACE-FILM FORMATION

GRAPHITE ANODES

PHOTOELECTRON-SPECTROSCOPY

LITHIUM SALT

INTERPHASE

CELLS

PERFORMANCE

MECHANISMS

MORPHOLOGY

Electron tunneling based SEI formation model

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