Journal article Open Access

Modeling of All-Solid-State thin-film Li-ion Batteries: accuracy improvement

Kazemi, N.; Danilov, D.; Haverkate, L.; Dudney, N.J.; Unnikrishnan, S.; Notten, H.L.


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    <subfield code="a">&lt;p&gt;Thin-film Solid-State Batteries (TFSSB) is one of most promising and quickly developing fields in modern electrochemical energy storage. Modeling these devices is&lt;br&gt;
interesting from theoretical and practical point of view. This paper represents a simulation approach for TFSSB which overcome a major drawback of available&lt;br&gt;
mathematical models, i.e. decline in accuracy of the models at high current rates. A one-dimensional electrochemical model, including charge transfer kinetics on the&lt;br&gt;
electrolyte-electrode interface, diffusion and migration in electrolyte as well as diffusion in intercalation electrode has been developed and the simulation results are&lt;br&gt;
compared to experimental voltage-capacity measurements. A new definition of diffusion coefficient as a function of concentration, based on the experimental&lt;br&gt;
measurements, is used to improve the performance of the model. The simulation results fit the available experimental data at low and high discharge currents up to 5&lt;br&gt;
mA cm&amp;minus;2. The models show that the cathode diffusion constant is a prime factor limiting the rate capability for TFSSB in particular for ultrafast charging applications.&lt;/p&gt;</subfield>
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