Monitoring battery electrolyte chemistry via in-operando tilted fiber Bragg grating sensors

Abstract

Operando tracking the chemical dynamics/states of a battery and its components is critical to their second life for boosting their sustainability. Herein, we demonstrate the feasibility and diversity of the...

Direct optical fiber monitor on stress evolution of the sulfur-based cathodes for lithium–sulfur batteries

“…The working principle and electrochemical immunity of FBG There are several kinds of optical fiber sensors that can be used for temperature and strain sensing, including fiber Bragg grating (FBG), 28 titled fiber Bragg grating (TFBG), 32 fiber Fabry-Pe ´rot interferometer (FPI) 33 and tapered fiber. 34 Compared with the other optical fiber sensors, FBGs are easy to fabricate and demodulate.…”

Operando optical fiber monitoring of nanoscale and fast temperature changes during photo-electrocatalytic reactions

“…An in situ and continuous monitoring of the surface temperature on a sub-μm-scale near a liquid-solid catalyst interface is provided by using a TFBG imprinted in a commercial single-mode fiber and coated with a nanoscale Au film acting as a working electrode. Unlike previous works on FBG- and TFBG-based fiber sensing in electrochemistry 30 – 33 , the fiber here is not used to measure electrical signals or electrolyte charge density through detection of surface plasmon effects, or to simply act as system thermometers in the electrolyte surrounding the electrodes. The CNT/gold coating allows for separate measurements of global reactor temperature (from shifts of the core guided mode) and of the metal surface, thanks to high-order cladding modes with high sensitivity to the metal temperature, without perturbation of the photo-electrocatalytic reactions.…”

“…This enables the development of a high-performance sensor for (bio-) chemical sensing 27 – 29 , electroactive biofilms 30 , and supercapacitors 31 . Recently, progress reported by Tarascon et al managed to decode the refractive index of electrolyte, thermal, and stress distribution of anode (cathode) inside commercial Na(Li)-ion cells by structured FBG and TFBG in an operando way 32 , 33 . All preliminary findings above convince the potential of optical fiber sensors for optimization of thermal measurement and chemical reactions of batteries for better performance.…”

Tracking Li-Ion Batteries Using Fiber Optic Sensors

“…According to recent COP21, COP25, COP26 Conferences, and EU2030 targets, there is a need for significant reductions in CO 2 and greenhouse gas emissions in a short span period, targeting the reduction of climate warming in 1.5-2.0°C up to 2030 [1]. With the worldwide acceptance of electric vehicles together with the new era of connected objects, ensuring battery reliability, lifetime, and sustainability is becoming a necessity [2]. In this way, batteries are currently seen as important technological enablers to drive the transition toward a decarbonized society.…”

“…Alternative solutions, due to their full advantages, such as greater precision, multiplexing, immunity to electromagnetic interference, chemical inertness, small size/low invasiveness, and a possibility to be tailored regarding their dimensions and sensitivities, are sensors based on optical fiber technology [2,. Since the first study developed by Pinto et al in 2013 [19], OFS starts to be integrated into lithiumion batteries (LIBs) to monitor critical key parameters, such as temperature and/or thermal gradients, strain, gases, pressure, electrochemical events (chemical changes and lithiation), refractive index, and the states of charge, discharge, health, power, energy, and safety (SoX) battery indicators (Figure 1).…”