State-of-charge indication in Li-ion batteries by simulated impedance spectroscopy

• We here explore the possibilities of correlating experimental cell impedance with finite element methodology modelling for state-of-charge (SoC) indication in LiFePO-based half-cells. The impedance response has been modelled sequentially during battery cycling using Newman theory, and is compared with experimental data. It is found that the charge-transfer resistance is dependent of SoC during battery charging, which can be modelled in good agreement with experimental results. Moreover, it is seen that cell design parameters-e.g. calendering-dependent electrode porosity-influence the EIS response and can thus be estimated using the presented methodology.

Ämnesord

NATURVETENSKAP  -- Kemi -- Fysikalisk kemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences -- Physical Chemistry (hsv//eng)

Nyckelord

Li-ion battery

State-of-charge determination

Impedance spectroscopy

Finite element methodology

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