Quantum dot-based sensing system for high accuracy and high-resolution temperature monitoring of EV batteries

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Rechargeable Lithium-ion (Li-ion) batteries are an essential part of automotive electrification, mobile communications, and consumer electronics. It is essential that Li-ion batteries operate reliably and safely, which requires real-time temperature monitoring. The current battery thermal sensing focuses on sensors placed at strategic locations along battery surfaces, which lack the spatial resolution to provide a complete thermal map. In situ temperature sensing inside each cell is therefore of paramount importance for the safety and efficiency of batteries. Such a technological solution is highly sought after to reduce failure and improve safety and quantum sensing technology can provide an ideal solution because of its size, ultrafast response, and resolution. This international quantum catalyst (quantum sensing and quantum materials) grant aims to initiate an international partnership to explore the viability of graphene-based quantum dot sensors in Li-ion batteries for high resolution and high accuracy temperature sensing. Graphene quantum dots (GQDs) are single or few layers of graphene that have unique and fascinating physical properties such as strong quantum confinement and edge-dependent electrical properties because the electronic transport is confined in all three spatial dimensions. Modifying their size, shape, and defects allows researchers to tailor the GQDs electrical and thermal properties for specific sensing applications. By optimizing their properties, we propose to develop a new class of GQD-based flexible, high-resolution, and highly precise temperature sensors that can be conformally fitted inside battery cells. The outcome will benefit Canadian quantum academics and industries through the comprehensive training of highly qualified personnel in the field of quantum science, materials, and quantum sensing thus contributing to strengthening Canadian skills in quantum technology. The proposed innovations and unique training in quantum sensors are expected to lay a solid foundation for the Canadian team to seek further funding to create a breakthrough in sensing technology and will thus directly assist the Canadian quantum academic and industry.