Figure | Working principle and performance of the MNFS*ZIF LIBs sensor. (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Figure | Working principle and performance of the MNFS*ZIF LIBs sensor.

Caption

a, Concept of electrolyte detection in LIBs using ZIF-8 membrane-coated MNFs; small quantities of electrolyte leaked from LIBs evaporates, generating gaseous DMC molecules, which causes a red-shift in the transmission spectrum of DMC observed by MNFs*ZIF. b, Schematic of ZIF-8 in-situ self-assembly on the MNFs within a polytetrafluoroethylene model. This model supports the fabrication of up to 10 MNFs*ZIF from the same batch, with each solution container having a volume of 1.5 mL. The waist region of the MNFs is suspended and clamped in the model, where in-situ ZIF-8 self-assembly, cleaning with a methanol solution, and vacuum drying are performed to ensure the stability of the adhered ZIF-8 on the MNF. Example of response and recovery time for the MNFs*ZIF sensor to DMC vapor at 145.2 ppm concentration. Resonant wavelength responses of MNFs*ZIF under 1 μL volumes of various electrolyte compositions, including PC, DMC, EMC, and DEC, along with their chemical structures. (c), Online leakage detection using the MNFs*ZIF sensor. Diagram of the LIB electrolyte leakage test system, where the MNFs*ZIF sensor was positioned at a high horizontal location in the chamber, and the LIB was placed at the chamber's base. A pouch lithium cell with a nominal voltage of 3.65 V was punctured with a hole approximately 2 mm in diameter to simulate leakage. An LED circuit, including a 100 Ω resistor in series, completed the setup. The LIB's external voltage was continuously measured using a multimeter to compare the voltage and LED status before (LED on, voltage = 3.939 V) and after (LED off, voltage = 1.616 V) the leakage event. Time-based variation of the LIB external voltage: at T < 0.25 h, the LIB remained open; at T = 0.25 h, the LED was connected; at T = 0.72 h, the LIB was punctured, starting the leakage; at T = 35 h, the LED was turned off. Changes in the MNFs*ZIF transmission spectrum's dip wavelength over the first 3.5 h, recorded at 1-min intervals by the wavelength modulator, until saturation.

Credit

by Shunfeng Sheng†, Hao Li et al.

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