Energy optimization of microbatteries by 3D thermal microscopy
Overview:
With the development of smart and autonomous systems, the development of efficient portable energy sources has become critical. Batteries are the most common systems for energy storage in portable applications. However, micro-supercapacitors1–4, also called micro-batteries, are becoming more and more convincing for such applications (see Figure 1). This type of energy storage has the following advantages: very fast charge/discharge, longer lifetime, and about 1000 times higher cycle number than Li-Ion batteries. The performance of these systems is temperature dependent, and a thorough study of the thermal properties and heat distribution at the microscale is required to identify areas for improvement and new thermally optimized architectures.
A microscope for the measurement of the temperature field by thermotransmittance has been developed in the laboratory allowing to obtain the temperature field at the microscale in materials semi-transparent in the infrared range5. This microscope has already demonstrated its efficiency in 2D and the development of a 3D version must be conducted. This thesis is a continuation of the development of this experimental tool for the finalization of the implementation of the three-dimensional measurement, for the thermal characterization of micro-batteries.
More specifically, the objectives of this thesis are:
- to understand the operation of a micro-battery and to identify the thermal losses
- to make a bibliographical study on the 3D mapping methods
- to develop the experimental setup to finalize the 3D measurement capabilities
- to validate the instrumentation on a reference sample
Profile of the candidate:
The student should have a strong background in engineering science and in particular in design, optical assembly and instrumentation. A strong taste for experimentation is required for this thesis, and knowledge in heat transfer and imaging would be appreciated.
Compensation:
approximately 2135€ per month (gross salary)
References
1. Jia, R., Shen, G., Qu, F. & Chen, D. Flexible on-chip micro-supercapacitors: Efficient power units for wearable electronics. Energy Storage Mater.27, 169–186 (2020).
2. Sun, X., Chen, K., Liang, F., Zhi, C. & Xue, D. Perspective on Micro-Supercapacitors. Front. Chem.9, 1–16 (2022).
3. Li, F. et al. Recent developments of stamped planar micro-supercapacitors: Materials, fabrication and perspectives. Nano Mater. Sci.3, 154–169 (2021).
4. Shen, C. et al. A Review of On-Chip Micro Supercapacitors for Integrated Self-Powering Systems. J. Microelectromechanical Syst.26, 949–965 (2017).
5. Bourges, C. et al. Infrared thermotransmittance-based temperature field measurements in semitransparent media. arXiv (2022) doi:10.48550/arXiv.2211.00275.
Expected starting date: 01/09/2023
Location: I2M, A11 building
Contact: Jérémie Maire
email: jeremie.maire@u-bordeaux.fr
phone number: 05 40 00 34 11
Supervisors: Jérémie Maire (I2M-TREFLE), Stéphane Chevalier (I2M-TREFLE) & Jean-Luc Battaglia (I2M-TREFLE)
