Reliability Analysis of Lithium-Sulfur Batteries in Their Life Cycles
Date Issued
2015
Date
2015
Author(s)
Chou, Bo-Yen
Abstract
The purpose of this research is to utilize reliability engineering theory to investigate the effects of uncertain factors on the degradation of lithium-sulfur batteries. A Markov process model is constructed to describe the capacity and capacity degradation of the battery and evaluate the distribution of its remaining life. A four-state model is found to be able to describe the fading curves of most lithium-sulfur battery systems having different cathode materials. It gives detailed insights into the fading mechanisms of lithium sulfur cells. The model is then used for the analysis of life distribution and reliability of the battery based on test or observed data. A warranty analysis of the battery is also presented. It is found that the proposed Markov model is able to describe the reliability of various kinds of lithium-sulfur battery. It is also verified through the model that metal oxide has a positive effect for lithium-sulfur batteries with regard to their lives.
Subjects
Lithium-Sulfur Battery
State of Health
Degradation
Remaining Life
Markov Process
Reliability Analysis
Type
thesis
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