A dictionary of options to be passed to the parameters. The options that
can be set are listed below.
”particle shape” :str, optional
Sets the model shape of the electrode particles. This is used to
calculate the surface area per unit volume. Can be “spherical”
(default) or “user”. For the “user” option the surface area per
unit volume can be passed as a parameter, and is therefore not
necessarily consistent with the particle shape.