Publication detail

A Simple Analytical Model of Capacity Fading for Lithium–Sulfur Cells

SEDLÁKOVÁ, V. ŠIKULA, J. SEDLÁK, P. ČECH, O. URRUTIA, L.

Original Title

A Simple Analytical Model of Capacity Fading for Lithium–Sulfur Cells

Type

journal article in Web of Science

Language

English

Original Abstract

A simple ageing model is proposed for the fading of lithium–sulfur (Li–S) cell capacity with the number of cycles. The model could be applied for the ageing description of cells with an unknown internal structure in a wide range of engineering applications. Cycle profile that patterns with the real-life operation of cells is proposed. Thus, the degradation of the cell is simultaneously influenced by the 100% depth-of-discharge cycling and the cell staying at a charged state. The proposed model is described by the differential equation considering that the decrease of cell capacity per cycle is proportional to the product of cycle number and the charge available to be discharged within the appropriate cycle. The model covers the degradation processes dominant in the initial stage of ageing, where the cell capacity decreases from 100% to about 25% of its initial value. The solution of the proposed differential equation is an analytical function that requires only three fitted parameters. The dependence of model parameters on the charge/discharge current rate is shown for studied Li–S cells. Possible sources of degradation, such as the decrease of electrode effective area and the decrease of potential barrier on the electrode/electrolyte interface, are determined from the evaluation of the coulombic efficiency of the charge/discharge process.

Keywords

Ageing; life estimation; lithium; modeling; sulfur

Authors

SEDLÁKOVÁ, V.; ŠIKULA, J.; SEDLÁK, P.; ČECH, O.; URRUTIA, L.

Released

6. 6. 2019

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA

Location

USA

ISBN

0885-8993

Periodical

IEEE TRANSACTIONS ON POWER ELECTRONICS

Year of study

34

Number

6

State

United States of America

Pages from

5779

Pages to

5786

Pages count

8

URL

https://ieeexplore.ieee.org/document/8464279

BibTex

@article{BUT157805,
  author="SEDLÁKOVÁ, V. and ŠIKULA, J. and SEDLÁK, P. and ČECH, O. and URRUTIA, L.",
  title="A Simple Analytical Model of Capacity Fading for Lithium–Sulfur Cells",
  journal="IEEE TRANSACTIONS ON POWER ELECTRONICS",
  year="2019",
  volume="34",
  number="6",
  pages="5779--5786",
  doi="10.1109/TPEL.2018.2870250",
  issn="0885-8993",
  url="https://ieeexplore.ieee.org/document/8464279"
}