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Failure Analysis of Batteries Using Synchrotron-based Hard X-ray Microtomography
Published on: August 26, 2015
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Visualising the problems with balancing lithium-sulfur batteries by "mapping" internal resistance
Matthew J Lacey1, Kristina Edström1, Daniel Brandell1
1Department of Chemistry - Ångström Laboratory, Lägerhyddsvägen 1, SE-75121 Uppsala, Sweden. matthew.lacey@kemi.uu.se.
Chemical Communications (Cambridge, England)
|September 29, 2015
Summary
Continuous battery internal resistance mapping visualizes cell behavior. This method reveals lithium-sulfur cell failure mechanisms under optimized conditions, enhancing battery diagnostics.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Understanding battery degradation is crucial for extending lifespan.
- Lithium-sulfur batteries offer high energy density but face challenges with stability and failure.
- Current methods for assessing battery health can be time-consuming or lack detailed insights.
Purpose of the Study:
- To introduce a novel method for continuous battery internal resistance measurement.
- To visualize battery cell behavior using resistance "maps" based on capacity and cycle number.
- To investigate cell failure mechanisms in lithium-sulfur (Li-S) batteries.
Main Methods:
- Utilizing a simple current-interrupt method for frequent internal resistance determination.
- Creating resistance "maps" to track changes in resistance over battery cycling.
- Applying the method to Li-S cells with optimized lithium electrode excesses.
Main Results:
- Demonstrated the ability to visualize dynamic changes in cell resistance.
- Identified specific resistance patterns associated with cell failure in Li-S systems.
- Provided insights into degradation pathways influenced by electrode stoichiometry.
Conclusions:
- Continuous internal resistance mapping is an effective tool for battery diagnostics.
- The developed method aids in understanding and predicting failure in advanced battery chemistries like Li-S.
- Optimizing electrode design can be guided by resistance mapping for improved battery performance and longevity.
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