Threshold-like dependence of silicon-based electrode performance on active mass loading and nature of carbon conductive additive

Karkar, Zouina; Mazouzi, Driss; Hernandez, Cuauhtémoc Reale; Guyomard, Dominique; Roué, Lionel; Lestriez, Bernard

doi:10.1016/j.electacta.2016.08.118

Cited by 53 publications

(59 citation statements)

References 48 publications

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“…These components are present in 71:7:11:9:2 wt% ratio, respectively. [31,32] Preparation of the electrode slurry was carried out by adding 1 ml H 2 O as solvent to 200 mg of the previous mix. A silicon nitride jar was used as a mixing medium with three silicon nitride balls.…”

Section: Electrode Preparationmentioning

confidence: 99%

Editors’ Choice—Understanding the Superior Cycling Performance of Si Anode in Highly Concentrated Phosphonium-Based Ionic Liquid Electrolyte

Araño

Mazouzi

Kerr

et al. 2020

J. Electrochem. Soc.

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Considerable effort has been devoted to improving the cyclability of silicon (Si) negative electrodes for lithium-ion batteries because it is a promising high specific capacity alternative to graphite. In this work, the electrochemical behaviour of Si in two ionic liquid (IL) electrolytes, triethyl(methyl)phosphonium bis(fluorosulfonyl)imide (P 1222 FSI) and N-propyl-Nmethylpyrrolidinium-FSI (C 3 mpyrFSI) with high and low lithium (Li) salt content is investigated at 50 °C. Results highlight that higher capacity and better cycling stability are achieved over 50 2 cycles with high salt concentration, the first time for a pyrrolidinium-based electrolyte in the area of Si negative electrodes. However, the Si cycling performance was far superior in the P 1222 FSIbased high salt content electrolyte compared to that of the C 3 mpyrFSI. To understand this unexpected result, diffusivity measurements of the IL-based electrolytes were performed using PFG-NMR, while their stability was probed using MAS-NMR and XPS after long-term cycling. A higher apparent transport number for Li ions in highly concentrated ILs, combined with a significantly lower extent of electrolyte degradation explains the superior cycle life of the highly concentrated phosphonium-based system. Si/concentrated P 1222 FSI-LiFSI/lithium nickel cobalt aluminum oxide (NCA) full cells with more than 3 mAh cm-2 nominal capacity deliver a promising cycle life and good rate capability.

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Section: Electrode Preparationmentioning

confidence: 99%

Editors’ Choice—Understanding the Superior Cycling Performance of Si Anode in Highly Concentrated Phosphonium-Based Ionic Liquid Electrolyte

Araño

Mazouzi

Kerr

et al. 2020

J. Electrochem. Soc.

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“…The RIC calculation is based on the studies published by Gauthier et al and is defined as the ratio between the irreversible loss capacity and the delivered charge capacity. [24,25] This capacity loss can be divided into two contributions, one coming from the SEI formation and the second from the particle disconnections. In this case, it is assumed that the irreversibility due to disconnections is mostly created during the charge, when the particles deflate upon dealloying, while the irreversibility due to the SEI formation is almost exclusively generated during the discharge.…”

Section: Formulation Ph Influence On Electrochemical Performancementioning

confidence: 99%

Silicon-based electrodes formulation in buffered solution for enhanced electrode-electrolyte interfaces

Roland

Delarre

Ledeuil

et al. 2021

Journal of Power Sources

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Silicon nanoparticles based composite electrodes for Li-ion batteries reach high specific capacities and enhance cyclability compared with larger silicon particles. Such electrodes are foreseen for the next generation Li-ion batteries (LiB). Playing on binder and conductive additives in the formulation of the Si based electrodes is a well-known strategy to to enhance performance. Aqueous electrode formulations using the carboxymethyl cellulose as environmentally friendly binder has already showed great cyclability enhancements, especially when employed in acidic conditions. In this study, pH = 1, 3 and 7 buffered solutions were studied as solvent to prepare the Si/C/CMC composite electrodes.The influence of the formulation pH on the electrode components interactions were followed through a combined ATR-FTIR / XPS experiment and discussed in relation with the electrode electrochemical performance. Interestingly, the pH=7 buffered solution show increased capacity retention and coulombic efficiency during 100 cycles compared with the electrode obtained in acidic conditions. Post mortem analysis and EIS study highlighted differences of electrode/current collector (CC) adhesion and SEI deposition.

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“…Figure (a)–(d) show cross‐sectional SEM images of pristine and cycled electrodes taken after 10, 50, and 100 cycles. As reported in previous studies, the cycled electrodes show height expansion and pores enlargement compared to the pristine electrode . Except for the thickness changes of the electrode, however, observations of the cross‐section of the cycled electrodes did not give us any other information on the changes in the microstructure such as mechanical degradation of the Si phase or SEI changes in the electrodes.…”

Section: Resultsmentioning

confidence: 67%

Cycle‐dependent Microstructural Changes of Silicon‐Carbon Composite Anodes for Lithium‐Ion Batteries

Sohn

Lee

Chung

et al. 2019

Bulletin Korean Chem Soc

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Si-based high capacity anodes are of the utmost importance for advancing energy density of lithium-ion batteries. The major shortcoming of Si-based anodes, however, is their poor cycle performance. To solve this problem, it is essential to understand the failure mechanisms of both the Si-based anodes. In this work, we observe the cycle-dependent microstructural evolution of a Si C composite/graphite-blended electrode using ex situ scanning electron microscopy observations and corresponding cross-sectional elemental mapping images. We reveal that the Si particles become finer and spread through the whole electrode and act as an electrochemically active site for electrolyte decomposition reactions. This forms a solid electrolyte interphase layer on the surface of the Si particles during cycling. The resulting electrolyte decomposition products surrounding the Si particles are finely spread throughout the whole blended electrode. This cycle-dependent microstructural change is one of the main reasons for the poor capacity retention of the blended electrode.

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Threshold-like dependence of silicon-based electrode performance on active mass loading and nature of carbon conductive additive

Cited by 53 publications

References 48 publications

Editors’ Choice—Understanding the Superior Cycling Performance of Si Anode in Highly Concentrated Phosphonium-Based Ionic Liquid Electrolyte

Editors’ Choice—Understanding the Superior Cycling Performance of Si Anode in Highly Concentrated Phosphonium-Based Ionic Liquid Electrolyte

Silicon-based electrodes formulation in buffered solution for enhanced electrode-electrolyte interfaces

Cycle‐dependent Microstructural Changes of Silicon‐Carbon Composite Anodes for Lithium‐Ion Batteries

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