Solid-state batteries are generally considered to be safer than their liquid-state counterparts due to their decreased potential for fire or short circuiting. They must also be robust enough to overcome mechanical abuse that can lead to thermal run away or failure. Furthermore, the fabrication of solid-state batteries relies on the application of stack crimping pressure that increases the interfacial surface contacts between electrolytes and the electrodes. However, excessive compressive crimping stresses (that occur in cell assembly) can give rise to cracking phenomena that can degrade battery performance. It is, therefore, important to develop an understanding of failure mechanisms in solid-state Li-ion electrolytes. In this paper, we use a combination of in-situ optical microscopy and Digital Imaging Correlation (DIC) strain mapping techniques to study compressive deformation and cracking phenomena in solid state Li-ion electrolytes. The stress states associated with the different stages of compressive deformation are also presented. The implications of the results are discussed for the design and processing of robust solid-state Li ion batteries.

Creator

• Ogunfunmi, Tofunmi

Contributors

• Liang, Jianyu
• Wang, Yan
• Oyewole, Oluwaseun K.
• Soboyejo, Winston

Degree

• MS

Unit

• Materials Science & Engineering

Publisher

• Worcester Polytechnic Institute

Identifier

• etd-4216

Advisor

• Soboyejo, Winston

Committee

• Wang, Yan
• Oyewole, Oluwaseun
• Liang, Jianyu

Defense date

• 2020-07-31

Year

• 2020

Date created

• 2020-08-21

Resource type

• Thesis

Rights statement

• In Copyright

Last modified

• 2023-10-09