Fig. 2: Characterization of FBG-FPI sensor and evaluation of cell’s performance with optical fiber implanted. | Nature Communications

Fig. 2: Characterization of FBG-FPI sensor and evaluation of cell’s performance with optical fiber implanted.

From: Operando monitoring of thermal runaway in commercial lithium-ion cells via advanced lab-on-fiber technologies

Fig. 2: Characterization of FBG-FPI sensor and evaluation of cell’s performance with optical fiber implanted.

a, b The FBG-FPI spectral and wavelength responses to temperature over the range from 25 to 600 °C, in which the FBG displays linear temperature sensitivity (see the zoomed FBG spectra inset), while the FPI shows insensitivity to temperature. c, d The FBG-FPI spectral and wavelength responses to pressure over the range of 0 ~ 2 MPa, in which the FPI shows a linear pressure sensitivity (in air), while the FBG shows insensitivity to pressure. e, f Demonstrate that the performance of cell is unaffected after implanted with optical fiber sensors. The cells used here are commercial 18650 lithium iron phosphate cells, the charging conditions are varied from 0.5 C to 2 C and the long-term test lasts for 100 cycles at 2 C (“C” indicates “C rate”, which is the ratio of charge/discharge current to rated capacity).

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