Electrolyte conductivity model equation

[lefile]

Hi!

Lithium current density in electrolyte in Full sub-model is calculated as (lines 55 - 57 in full_conductivity.py):
i_e = (param.kappa_e(c_e, T) * tor) * ( param.chiRT_over_Fc(c_e, T) * pybamm.grad(c_e) - pybamm.grad(phi_e) )
while in paper "An Asymptotic Derivation of a Single Particle Model with Electrolyte" in Eq. 1b it is defined as:

The difference is in natural logarithm of electrolyte concentration before it put in gradient. Am I missing something or is this a bug?

Best regards!

[valentinsulzer]

grad(log(c)) = 1/c * grad(c) by the chain rule, the 1/c is included in chiRT_over_FC