Electrochemical analysis of silicon nanoparticle lithiation – Effect of crystallinity and carbon coating quantity

Bernard, Pierre; Alper, John P.; Haon, Cédric; Herlin‐Boime, Nathalie; Chandesris, Marion

doi:10.1016/j.jpowsour.2019.226769

Cited by 23 publications

(17 citation statements)

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“…The phenomenon is less apparent at lower size, thus small SiNPs should be favored for long term cycling. Alternatively, sintering is efficiently prevented by a carbon coating, conveniently obtained in the same reactor just after pyrolysis, as we recently reported [ 60 ]. When comparing SiNWs to SiNPs, it appears that the initial specific capacity of SiNWs is lower due to their micron-sized agglomerate form, while the CE of SiNWs is more stable and can be very high for the smallest size.…”

Section: Discussionmentioning

confidence: 99%

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Effect of Size and Shape on Electrochemical Performance of Nano-Silicon-Based Lithium Battery

et al. 2021

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Silicon is a promising material for high-energy anode materials for the next generation of lithium-ion batteries. The gain in specific capacity depends highly on the quality of the Si dispersion and on the size and shape of the nano-silicon. The aim of this study is to investigate the impact of the size/shape of Si on the electrochemical performance of conventional Li-ion batteries. The scalable synthesis processes of both nanoparticles and nanowires in the 10–100 nm size range are discussed. In cycling lithium batteries, the initial specific capacity is significantly higher for nanoparticles than for nanowires. We demonstrate a linear correlation of the first Coulombic efficiency with the specific area of the Si materials. In long-term cycling tests, the electrochemical performance of the nanoparticles fades faster due to an increased internal resistance, whereas the smallest nanowires show an impressive cycling stability. Finally, the reversibility of the electrochemical processes is found to be highly dependent on the size/shape of the Si particles and its impact on lithiation depth, formation of crystalline Li15Si4 in cycling, and Li transport pathways.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effect of Size and Shape on Electrochemical Performance of Nano-Silicon-Based Lithium Battery

et al. 2021

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“…42,50−52 The thin in situ generated CNS with a smaller mesoporous structure closely covered on the surface of PSi could further form a very steady composite structure with an increased specific surface area and enhanced intermolecular interactions, resulting in a larger electrolyte−electrode contact area and a shortened lithium-ion transmission path, which is beneficial to further improve the lithium storage capacity and long-term structural stability. 53,54 The electrochemical performance of different electrode materials was studied. The CV curves of PSi@CNS at the first four cycles are shown in Figure 6a at a scanning rate of 0.1 mV/s with a voltage range of 0.01−1.5 V (vs Li/Li + ).…”

Section: Resultsmentioning

confidence: 99%

In Situ Generated Carbon Nanosheet-Covered Micron-Sized Porous Si Composite for Long-Cycling Life Lithium-Ion Batteries

Luo

Fang

Zhang

et al. 2020

ACS Appl. Energy Mater.

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Micron-sized silicon-based materials have attracted immense attention for large-scale lithium-ion batteries (LIBs) owing to high theoretical capacity and low cost. However, it is limited by severe volume expansion and fast capacity fading in a cycling process. Here, we proposed a facile strategy to obtain an in situ formed carbon nanosheet template-covered micron-sized porous silicon composite (PSi@CNS) from the low-cost Al−Si alloy and bicontinuous C 6 H 12 O 6 / SiO 2 structural layer. The templated assembly of the inner distributed PSi and outer in situ generated CNS can form a stable and controllable conductive structure with an increased specific surface area and enhanced intermolecular interactions. This unique composite structure results in a significant increase of electrolyte transfer and long-term stability. As an anode material for LIBs, the PSi@CNS composite exhibits a high reversible capacity of 1272 mA h g −1 at 1 A g −1 after 500 cycles in the micron-sized PSi/C composite system. This work provides a templated idea for long-term stable LIBs.

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“…4,5 Several strategies can improve silicon cycling problematics, such as carbon-coated nanostructured electrodes, which have demonstrated a better-cycled life and improved pulverization by avoiding direct contact with the electrolyte and forming a well-behaved solid electrolyte interphase (SEI). [6][7][8][9] Furthermore, mixing silicon with graphite to develop composites has improved aging behavior and capacity retention by creating a conductive matrix that sustains silicon volume expansion. [10][11][12] A growing interest in improving LiBs cycle life is also linked to optimizing the battery manufacturing process.…”

Section: Introductionmentioning

confidence: 99%

Understanding the processability of graphite blend electrodes with silicon nanoparticles

Dominguez

Franco

2022

Preprint

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The manufacturing process aims to optimize the parameters leading to enhanced Lithium-Ion Battery (LiB) electrode properties. Particularly, developing silicon/graphite blends could be an alternative for boosting LiB energy density while using the longstanding properties of graphite. Here, we report the manufacturing parameters impact of the mixing, coating, and calendering steps on the properties of silicon/graphite blend electrodes. The mixing process was assessed by the solid and silicon content dependency, where the viscosity increases when increasing the solid and decreasing the silicon content. Moreover, the slurry rheology directly impacts the mechanical stability of the electrode when coating using thicker comma gaps. The calendering step evidences a porosity threshold necessary for adequate ionic resistance and cycling life. We found that porosities between 45% to 56% for these silicon/graphite blends yield higher performance. Lower than 30% porosity highly impacts the electrochemical performance in a detrimental way.

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Electrochemical analysis of silicon nanoparticle lithiation – Effect of crystallinity and carbon coating quantity

Cited by 23 publications

References 50 publications

Effect of Size and Shape on Electrochemical Performance of Nano-Silicon-Based Lithium Battery

Effect of Size and Shape on Electrochemical Performance of Nano-Silicon-Based Lithium Battery

In Situ Generated Carbon Nanosheet-Covered Micron-Sized Porous Si Composite for Long-Cycling Life Lithium-Ion Batteries

Understanding the processability of graphite blend electrodes with silicon nanoparticles

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