Operando discrimination of fast and slow active grains within a cycling electrode for lithium battery

Tanguy, François; Gaubicher, Joël; Guyomard, Dominique

doi:10.1016/j.elecom.2010.01.043

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…Accordingly, the electrochemical reactivity of the system appears strongly inhibited on discharge, which is most likely the reason for the failure of step A and therefore of the whole system. 22 This tendency of the system to ''polarise'' only slightly occurs on charge. This is a major point that mirrors a SEI related issue.…”

Section: Electrochemical Investigationsmentioning

confidence: 99%

The failure mechanism of nano-sized Si-based negative electrodes for lithium ion batteries

et al. 2011

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International audienceUnderstanding the failure mechanism of silicon based negative electrodes for lithium ion batteries is essential for solving the problem of low coulombic efficiency and capacity fading on cycling and to further implement this new very energetic material in commercial cells. To reach this goal, several techniques are used here: post mortem7Li MAS NMR and SEM, electrochemical impedance spectroscopy (EIS) and three-electrode-based electrochemical analysis. 7Li MAS NMR analyses of the charged batteries demonstrate that the major part of the lithium lost during the charge of batteries is not trapped in LixSi alloys but instead at the surface of the Si particles, likely as a degradation product of the liquid electrolyte. Observed by SEM, a dead electrode has a thick "SEI" layer at its surface. EIS and incremental capacity analyses demonstrate that the growth of this layer is responsible for the failure of the electrode through a continuous decrease of its active surface area associated with a rise of the electrode polarization. It is demonstrated that the main cause of capacity fade of Si-based negative electrodes is the liquid electrolyte degradation in the case of nano Si-particles formulated with the carboxymethyl cellulose (CMC) binder. This degradation results in the formation of a blocking layer on the active mass, which further inhibits lithium diffusion through the composite electrode

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Section: Electrochemical Investigationsmentioning

confidence: 99%

The failure mechanism of nano-sized Si-based negative electrodes for lithium ion batteries

et al. 2011

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“…8 The term first appeared in battery literature in the year 2010 in reporting X-ray absorption and diffraction experiments. 9,10 The use of operando experimental battery research has greatly increased in the past few years, as shown in Fig. 1.…”

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confidence: 99%

Review—Operando Optical Spectroscopy Studies of Batteries

Meyer

Saqib

Porter

2021

J. Electrochem. Soc.

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The application of in situ optical spectroscopy in battery research has rapidly grown in popularity in the past few decades, yielding considerable new understanding of battery electrochemistry. Most recently, researchers have focused on developing optically-accessible battery cells and spectroscopic techniques suitable for studying batteries under commercially-relevant conditions. These “operando” spectroscopic studies have led to better understanding of the complex electrochemical mechanisms and transport behaviors that are critical to improve battery performance and develop new battery chemistries. The growth in popularity and sophistication as well as the multidisciplinary nature of these studies motivates this comprehensive summary of operando optical battery research, including recent advances upon which to build further investigation. In that interest, this review covers the development of operando optical spectroscopy, the spectroscopic methods used, the various approaches to building optically-accessible cells, recent technical advances, and their application to specific battery phenomena, including: solid electrolyte interphases, polysulfide shuttling, lithium intercalation, plating and transport, electrode structure, electrode surface reactions, and electrolyte decomposition. The review concludes by surveying emerging techniques and identifying promising areas for further development.

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Nanoscale compositional changes during first delithiation of Si negative electrodes

Gauthier

Danet

Lestriez

et al. 2013

Journal of Power Sources

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Operando discrimination of fast and slow active grains within a cycling electrode for lithium battery

Cited by 3 publications

References 11 publications

The failure mechanism of nano-sized Si-based negative electrodes for lithium ion batteries

The failure mechanism of nano-sized Si-based negative electrodes for lithium ion batteries

Review—Operando Optical Spectroscopy Studies of Batteries

Nanoscale compositional changes during first delithiation of Si negative electrodes

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