Hollow-core optical fibre sensors for operando Raman spectroscopy investigation of Li-ion battery liquid electrolytes

Ermanno Miele, Wesley M. Dose, Ilya Manyakin, Michael H. Frosz, Zachary Ruff, Michael F. L. Volder, Clare P. Grey (), Jeremy J. Baumberg () and Tijmen G. Euser ()
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Ermanno Miele: University of Cambridge
Wesley M. Dose: University of Cambridge
Ilya Manyakin: University of Cambridge
Michael H. Frosz: Max Planck Institute for the Science of Light
Zachary Ruff: University of Cambridge
Michael F. L. Volder: The Faraday Institution, Quad One, Harwell Science and Innovation Campus, Didcot
Clare P. Grey: University of Cambridge
Jeremy J. Baumberg: University of Cambridge
Tijmen G. Euser: University of Cambridge

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: 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 LiNi0.8Mn0.1Co0.1O2 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.

Date: 2022
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DOI: 10.1038/s41467-022-29330-4

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