Paper
20 November 2024 In situ state characterization monitoring of 18650 lithium-ion batteries with high-rate charge and discharge based on the high-stability fibre-optic sensor
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Abstract
Lithium-ion batteries (LIBs) experience intense electrochemical reactions during high-rate charge/discharge cycles, resulting in significant differences in state characteristics between the inside and outside of the battery. However, most monitoring techniques are severely limited in safety and accuracy due to the intense redox reactions inside LIBs. Thus, we propose a highly stable fibre-optic microcavity sensor based on the Fabry-Perot (F-P) interference principle, which is capable of real-time, in-situ monitoring of the state characteristics inside the LIBs. The degree of electrochemical reactions inside the battery is reflected by extracting the internal gas pressure state characteristics of LIBs at different charging and discharging rates. This experimental result demonstrates that the voltage is closely related to the gas pressure inside the battery and that the cyclic gas pressure increases greatly with the charge/discharge rate increase. This fibre-optic sensing approach provides a promising tool for monitoring in-situ battery state characteristics and safety.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
Ke Tan, Shuang Wang, Junfeng Jiang, Hongyu Liu, Xiaoshuang Dai, and Tiegen Liu "In situ state characterization monitoring of 18650 lithium-ion batteries with high-rate charge and discharge based on the high-stability fibre-optic sensor", Proc. SPIE 13243, Advanced Sensor Systems and Applications XIV, 132430E (20 November 2024); https://doi.org/10.1117/12.3035286
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KEYWORDS
Microelectromechanical systems

Batteries

Optical microcavities

Fiber optics sensors

Electrodes

Sensors

Fabrication

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