Implanting fiber optic sensors to "inquire" the battery
As one of the most versatile energy storage technologies, rechargeable batteries play a central role in the transition from fossil fuels to renewable energy. This increasing demand makes the reliability and life performance of the battery more important than ever, thus highlighting the importance of accurately monitoring the functional status of the battery, and real-time monitoring of the dynamic chemical and thermal changes of the battery during operation. It is the key to ensure that its safety and reliability are not damaged.
Recently, Professor Jean-Marie Tarascon, a member of the French Academy of Sciences and a member of the Royal Society of Chemistry, published a paper on "Nature-Energy" as the corresponding author, saying that they used traditional single-mode or micro-structure fiber fiber grating sensors (FBS) to prepare The battery with optical sensing function successfully unlocked the high-precision monitoring of temperature and pressure during the cycle of electrochemical battery at the same time, which was an unprecedented achievement.
Studies have shown that by adjusting the fiber shape and the temperature and pressure-related wavelengths, it is possible to accurately measure the chemical changes during the battery cycle, such as the solid electrolyte interphase (SEI) formation and structural evolution, which greatly improves the understanding of the battery during the cycle. The ability of reaction and interfacial growth kinetics.
In addition, the author also demonstrated how to use multiple sensors to determine the heat generated by the battery without using microcalorimetry. Unlike traditional isothermal calorimetry, the thermal capacity contribution of the battery is easily evaluated, allowing a fully parameterized thermal model.
Not only that, this research can be applied to both sodium-ion and lithium-ion batteries, both in commercialized 18650 batteries and soft-pack batteries, enabling accurate and error-free monitoring. More importantly, optical sensing can also monitor key thermodynamic parameters of aging in button cells.
Regardless of whether it is a sodium-ion battery or a lithium-ion battery, the accuracy of the test can be guaranteed when different electrolytes or different types of batteries are used. These findings provide a scalable solution for screening electrolyte additives, quickly identifying the optimal formation process of commercial batteries, and designing battery thermal management systems, and also inject new vitality into battery development. (midsummer)
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