Hollow-core Optical Fibre Sensors for Operando Raman Spectroscopy Investigation of Li-ion Battery Liquid Electrolytes

Overview

Journal Nat Commun

Specialty Biology

Date 2022 Mar 29

PMID 35347137

Authors

Ermanno Miele

Wesley M Dose

Ilya Manyakin

Michael H Frosz

Zachary Ruff

Michael F L De Volder

Clare P Grey

Jeremy J Baumberg

Tijmen G Euser

Affiliations

Soon will be listed here.

Abstract

Improved analytical tools are urgently required to identify degradation and failure mechanisms in Li-ion batteries. However, understanding and ultimately avoiding these detrimental mechanisms requires continuous tracking of complex electrochemical processes in different battery components. Here, we report an operando spectroscopy method that enables monitoring the chemistry of a carbonate-based liquid electrolyte during electrochemical cycling in Li-ion batteries with a graphite anode and a LiNiMnCoO cathode. By embedding a hollow-core optical fibre probe inside a lab-scale pouch cell, we demonstrate the effective evolution of the liquid electrolyte species by background-free Raman spectroscopy. The analysis of the spectroscopy measurements reveals changes in the ratio of carbonate solvents and electrolyte additives as a function of the cell voltage and show the potential to track the lithium-ion solvation dynamics. The proposed operando methodology contributes to understanding better the current Li-ion battery limitations and paves the way for studies of the degradation mechanisms in different electrochemical energy storage systems.

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