Journal article Open Access

A modified pseudo-steady-state analytical expression for battery modeling

Kudakwashe Chayambuka; Grietus Mulder; Dmitri L. Danilov; Prof. Peter H. L. Notten


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{
  "DOI": "10.1016/j.ssc.2019.04.011", 
  "author": [
    {
      "family": "Kudakwashe Chayambuka"
    }, 
    {
      "family": "Grietus Mulder"
    }, 
    {
      "family": "Dmitri L. Danilov"
    }, 
    {
      "family": "Prof. Peter H. L. Notten"
    }
  ], 
  "issued": {
    "date-parts": [
      [
        2019, 
        4, 
        24
      ]
    ]
  }, 
  "abstract": "<p>The solid-state spherical diffusion equation with flux boundary conditions is a standard problem in lithium-ion battery simulations. If finite difference schemes are applied, many nodes across a discretized battery electrode become necessary, in order to reach a good approximation of solution. Such a grid-based approach can be appropriately avoided by implementing analytical methods which reduce the computational load. The pseudo-steady-state (PSS) method is an exact analytical solution method, which provides accurate solid-state concentrations at all current densities. The popularization of the PSS method, in the existing form of expression, is however constrained by a solution convergence problem. In this short communication, a modified PSS (MPSS) expression is presented which provides uniformly convergent solutions at all times. To minimize computational runtime, a fast MPPS (FMPPS) expression is further developed, which is shown to be faster by approximately three orders of magnitude and has a constant time complexity. Using the FMPSS method, uniformly convergent exact solutions are obtained for the solid-state diffusion problem in spherical active particles.</p>", 
  "title": "A modified pseudo-steady-state analytical expression for battery modeling", 
  "type": "article-journal", 
  "id": "3253470"
}
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