Solid-state diffusion limitations on pulse operation of a lithium ion cell for hybrid electric vehicles

Kandler Smith, Chao Yang Wang

Research output: Contribution to journalArticle

225 Scopus citations

Abstract

A 1D model based on physical and electrochemical processes of a lithium ion cell is used to describe constant current and hybrid pulse power characterization (HPPC) data from a 6 Ah cell designed for hybrid electric vehicle (HEV) application. An approximate solution method for the diffusion of lithium ions within active material particles is formulated using the finite element method and implemented in the previously developed 1D electrochemical model as an explicit difference equation. Reaction current distribution and redistribution processes occurring during discharge and current interrupt, respectively, are driven by gradients in equilibrium potential that arise due to solid diffusion limitations. The model is extrapolated to predict voltage response at discharge rates up to 40 C where end of discharge is caused by negative electrode active material surface concentrations near depletion. Simple expressions are derived from an analytical solution to describe solid-state diffusion limited current for short duration, high-rate pulses.

Original languageEnglish (US)
Pages (from-to)628-639
Number of pages12
JournalJournal of Power Sources
Volume161
Issue number1
DOIs
StatePublished - Oct 20 2006

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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