Broad ion beam cross-sectioning, microscopy, and image analysis of battery electrode morphology
(2022) MMTM05 20221Production and Materials Engineering
- Abstract
- Lithium-ion batteries (LiB) are witnessing an increasing demand for electric vehicles. It provides a sustainable energy storage solution that is more efficient and ecofriendly than the fossil fuels. However, LiB are prone to ageing, which changes the dynamics of the electrochemical reactions over time and usage, and consequently affects its life and performance.. Ageing can manifest through multiple mechanisms that are also intertwined. Therefore, the understanding of these mechanisms is vital to designing more efficient and longer lasting batteries.
Physical characterization of the electrodes and other battery materials provides insights into the ageing mechanism, it helps visualize the effects or causes of the mechanism and can... (More) - Lithium-ion batteries (LiB) are witnessing an increasing demand for electric vehicles. It provides a sustainable energy storage solution that is more efficient and ecofriendly than the fossil fuels. However, LiB are prone to ageing, which changes the dynamics of the electrochemical reactions over time and usage, and consequently affects its life and performance.. Ageing can manifest through multiple mechanisms that are also intertwined. Therefore, the understanding of these mechanisms is vital to designing more efficient and longer lasting batteries.
Physical characterization of the electrodes and other battery materials provides insights into the ageing mechanism, it helps visualize the effects or causes of the mechanism and can provide an aid to the electrochemical measurements. This project develops the technique of BIB-SEM and image analysis to study the electrode morphology and quantify the ageing mechanisms. Results from the method development show that there is an increase in the electrode dimensions with a ageing, there is also increase in particle cracking that is location based. The extent of particle cracking is higher, closer to the separator and gradually reduces closer to the current collector. This is also followed by an expected increase in porosity and reduction in tortuosity. The Li plating was also observed between the separator and graphite, the region consisted of filiform dendrites which extended into the separator. However, better imaging needs to be used to study the separator and the Li inclusions. The results also need to be compared against electrochemical measurements to correlate with the physical quantification (Less) - Popular Abstract
- Lithium-ion batteries (LiB) are witnessing an increasing demand for electric vehicles. It provides a sustainable energy storage solution that is more efficient and eco-friendly than the fossil fuels. Batteries work on the principal of transferring ions and electrons back and forth and this reaction can be characterized through various factors one such being tortuosity. Similar to most energy storage solutions LiBs deteriorate over time. This affects the performance and life time of the batteries. Therefore it is crucial to study this mechanism in order to produce a more efficient and long lasting solution.
One of the methods to study the mechanism is through analysing the changes in the materials. This technique visualises the... (More) - Lithium-ion batteries (LiB) are witnessing an increasing demand for electric vehicles. It provides a sustainable energy storage solution that is more efficient and eco-friendly than the fossil fuels. Batteries work on the principal of transferring ions and electrons back and forth and this reaction can be characterized through various factors one such being tortuosity. Similar to most energy storage solutions LiBs deteriorate over time. This affects the performance and life time of the batteries. Therefore it is crucial to study this mechanism in order to produce a more efficient and long lasting solution.
One of the methods to study the mechanism is through analysing the changes in the materials. This technique visualises the mechanisms helps track the evolution of the materials. This project aims to develop a technique called the Broad Ion Beam (BIB) to crossection battery materials and then image the surface through Scanning Electron Microscopy (SEM) and then analyse the surface and measure tortuosity. The results from this technique are then used to analyse two different cells and also compare the differences observed with ageing. It was found that particle cracking and delamination was prominent with ageing. The tortuosity also consequently reduced with ageing. The Li plating was also observed. The results also need to be compared against electrochemical measurements to correlate with the physical quantification. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9088010
- author
- Saleem Siddiqui, Aamer Mohammed LU
- supervisor
- organization
- course
- MMTM05 20221
- year
- 2022
- type
- H2 - Master's Degree (Two Years)
- subject
- keywords
- BIB, SEM, Li Plating, Particle cracking, Tortuosity, Image analysis
- report number
- LUTMDN/(TMMV-5342)/1-48/2022
- language
- English
- id
- 9088010
- date added to LUP
- 2022-06-16 13:50:12
- date last changed
- 2022-06-16 13:50:12
@misc{9088010,
abstract = {{Lithium-ion batteries (LiB) are witnessing an increasing demand for electric vehicles. It provides a sustainable energy storage solution that is more efficient and ecofriendly than the fossil fuels. However, LiB are prone to ageing, which changes the dynamics of the electrochemical reactions over time and usage, and consequently affects its life and performance.. Ageing can manifest through multiple mechanisms that are also intertwined. Therefore, the understanding of these mechanisms is vital to designing more efficient and longer lasting batteries.
Physical characterization of the electrodes and other battery materials provides insights into the ageing mechanism, it helps visualize the effects or causes of the mechanism and can provide an aid to the electrochemical measurements. This project develops the technique of BIB-SEM and image analysis to study the electrode morphology and quantify the ageing mechanisms. Results from the method development show that there is an increase in the electrode dimensions with a ageing, there is also increase in particle cracking that is location based. The extent of particle cracking is higher, closer to the separator and gradually reduces closer to the current collector. This is also followed by an expected increase in porosity and reduction in tortuosity. The Li plating was also observed between the separator and graphite, the region consisted of filiform dendrites which extended into the separator. However, better imaging needs to be used to study the separator and the Li inclusions. The results also need to be compared against electrochemical measurements to correlate with the physical quantification}},
author = {{Saleem Siddiqui, Aamer Mohammed}},
language = {{eng}},
note = {{Student Paper}},
title = {{Broad ion beam cross-sectioning, microscopy, and image analysis of battery electrode morphology}},
year = {{2022}},
}