📰 A technology to “see” into commercial batteries

A multidisciplinary research team involving scientists from the Collège de France, the CNRS, the University of Rennes 1 and the University of Montpellier has developed a method to follow the evolution of chemistry inside a drums, live, and everything (The whole understood as the whole of what exists is often interpreted as the world or…) throughout its multiple charges and discharges. Featured in NatureEnergy on November 7, 2022, this technology (The word technology has two de facto meanings:) paves the way for improving the performance and design of future batteries.

Batteries provide the ability to storeenergy (In common sense, energy designates everything that allows you to do work, make energy, etc.) in chemical form: during the charge (The payload represents what is actually…)the stream strength (The word force can designate a mechanical power over things, and also, metaphorically, a…) chemical reactions and the energy is stored, then during the discharge a spontaneous electrochemical reaction generates the shift (In geometry, a displacement is a similarity that preserves distances and angles…) reverse (In mathematics, the inverse of an element x of a set endowed with a law of…) electrons in the system. Energy is released to create a Electric power (An electric current is a set displacement of charge carriers…).

Diagram of the propagation of light infrared (Infrared (IR) radiation is electromagnetic radiation with a wavelength…) through the heart of a optical fiber (An optical fiber is a very thin glass or plastic thread which has the property of…) in glass (Glass, in everyday language, means a hard, fragile material or alloy…) composition: Te2As3Se5 (TAS). To the surface (A surface generally refers to the superficial layer of an object. The term a…) of the fiber (A fiber is an elementary formation, vegetable or animal, of filamentous aspect, se…)a evanescent wave (Evanescent waves generally appear as possible solutions of…) is created and can interact with surrounding molecules. The fiber (A fiber is an elementary formation, vegetable or animal, of filamentous aspect, se…) TAS went through a empty (Void is usually defined as the absence of matter in a spatial area.) in the center of a type 18650 battery. The chemical bonds corresponding to the electrolyte can thus be observed during its use.
© Gervillié-Mouravieff et al./Collège de France

Control and study the chemistry (Chemistry is a natural science divided into several specialties, to…) of a battery is therefore crucial to understand its functioning, but also to improve its design. If the exercise is easy in the laboratory, it is much less so when it is integrated into a system. But a team of research (Scientific research designates in the first place all the actions undertaken with a view to…) multidisciplinary project led by scientists from the Chemistry of Solids and Energy laboratory (CNRS/Collège de France/Sorbonne University) has just developed point (graphics) a method to follow the evolution of the chemistry of a commercial battery, live, during its charge or its discharge.

The technology, presented in an article published in Naturerests on the transportation (Transportation is the act of carrying something, or someone, from one place to another, the most…) infrared light in chalcogenide glass optical fibers placed through a battery. L’interaction (An interaction is an exchange of information, affects or energy between two agents within…) of this light with the constituents of the battery makes it possible to identify and follow the chemical molecules present around (Autour is the name that the avian nomenclature in the French language (update) gives…) fiber.

Battery traversed by a chalcogenide glass optical fiber to transport light in the infrared range. The interaction of this light with the constituents of the battery makes it possible to identify and follow the chemical molecules present around the fibre.
© Frédérique PLAS / CSE / CNRS (The National Center for Scientific Research, better known by its acronym CNRS, is the largest…) Photo library

The researchers were thus able to observe the evolution of electrolytes as well as the insertion/extraction of sodium-lithium ions in the electrodes as a function of the charge. And this while it was in use, a first! With this system, scientists were also able to study theinterface (An interface is an area, real or virtual, that separates two elements. The interface…) between the electrolyte and the material (A material is a material of natural or artificial origin that man shapes…) negative electrode called Solid electrolyte interphase (UTE). This layer, both ion conductor and electron insulator, determines the longevity (The longevity of a living being is the length of life for which it is…) batteries. In particular, the team was able to follow in situ the nature of the chemical species involved in the nucleation and growth of the SEI which is set up during the very first charge of a battery.

From a point of seen (Sight is the sense that allows to observe and analyze the environment through reception and…) In practice, these results pave the way for easier and improved battery design. Currently, the optimization of electrolytes and load test protocols takes a long time to find the best option for an ideal SEI, and thus improve the longevity of a battery. With this new and unprecedented method, it is possible to quickly and precisely see how each element of the recipe evolves, interacts with the others and influences the performance of the battery. The research team continues its work focusing on the SEI and hopes to reveal all its secrets.

Unlocking cell chemistry evolution with in-operando fiber optic IR spectroscopy in commercial Na(Li)-ion batteries.
Charlotte Gervillié-Mouravieff, Catherine Boussard-Plédel, J. Huang, Cédric Leau, L. Albero Blanquer, Mouna Ben Yahia, Marie-Liesse. Doublet, ST Boles, Xianghua H. Zhang, Jean-Luc Adam and Jean-Marie Tarascon.
NatureEnergyNovember 7 month (The month (From lat. mensis “month”, and formerly in plural “menses”) is a period of time…) 2022. DOI:10.1038/s41560-022-01141-3

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