Silicon/Hollow γ-Fe<sub>2</sub>O<sub>3</sub> Nanoparticles as Efficient Anodes for Li-Ion Batteries

Grinbom, Gal; Duveau, D.; Gershinsky, Gregory; Monconduit, Laure; Zitoun, David

doi:10.1021/acs.chemmater.5b00730

Cited by 40 publications

(15 citation statements)

References 26 publications

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“…The reduction peak observed during the first lithiation is irreversible in the potential window [0–1 V]. As shown in a previous study, the Li insertion at 1.4 V is consistent with the conversion reaction of Fe 2 O 3 . The low potential lithiation close to 0 V is attributed to the alloying of crystalline silicon with lithium to yield amorphous lithiated silicon …”

Section: Resultssupporting

confidence: 85%

Synthesis of Carbon Nanotubes Networks Grown on Silicon Nanoparticles as Li-Ion Anodes

et al. 2017

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Using chemical vapor deposition, we grew carbon nanotubes (CNTs) on the surface of Si nanoparticles (NPs) that were coated with a thin iron shell. We studied the CNT growth mechanisms and analyzed the influence of (1) varying annealing times and (2) varying growth times. We show that an initial annealing is necessary to reduce the iron oxide shell and to start the formation of Fe NPs and their consequent coarsening. We characterize the evolution of the catalyst morphology and its influence of the morphology and structure of the CNTs grown. We studied this nanocomposite of Si NPs interconnected by CNTs grown on them as anode material for Li-ion batteries. Compared to the pristine Si NPs, the Si-CNT nanocomposite brings an increase of 40% in specific capacity after 100 cycles at 1800 mA/gSi with a high stability and a very low capacity loss per cycle of 0.06%. The electrochemical performance demonstrates how efficient the CNT shell on the Si NP is to mitigate the usual failure mechanism of Si NPs. Thus, the in situ growth of CNTs on Si anode materials can be an efficient route toward the synthesis of more stable Si anode composites for a Li-ion battery.

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Section: Resultssupporting

confidence: 85%

Synthesis of Carbon Nanotubes Networks Grown on Silicon Nanoparticles as Li-Ion Anodes

et al. 2017

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“…Reducing the particle size of the Si materials from the bulk to the nanoscale, in forms including nanoparticles, , nanotubes, nanowires, and porous spheres, , can offer high interfacial area, fast electronic and ionic diffusion, and alleviation of the strain, thus demonstrating superior performance . The fabrication of Si active/inactive nanocomposites is a straightforward and effective approach to avoid direct contact between the surface of the Si and the electrolyte, and therefore, the nanocomposites maintain a relatively stable SEI film and improved cycling performance. − For example, amorphous carbon-coating strategies are attractive because of the outstanding electronic conductivity, and more importantly, they provide a barrier layer to isolate Si active materials from the electrolytes. − The compact carbon layers, unfortunately, are prone to fracture due to the rigid structure and large volume expansion of Si . An addition of void spaces around Si particles is necessary to ensure the structural integrity during the cycling process, such as by the formation of hollow core–shell, , yolk–shell, and porous structures. , Such constructions are usually accompanied by the use of hazardous hydrofluoric acid and, as well, give rise to the inferior mechanical and thermal stability .…”

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confidence: 99%

Silicon/Mesoporous Carbon/Crystalline TiO₂ Nanoparticles for Highly Stable Lithium Storage

et al. 2016

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A core-shell-shell heterostructure of Si nanoparticles as the core with mesoporous carbon and crystalline TiO as the double shells (Si@C@TiO) is utilized as an anode material for lithium-ion batteries, which could successfully tackle the vital setbacks of Si anode materials, in terms of intrinsic low conductivity, unstable solid-electrolyte interphase (SEI) films, and serious volume variations. Combined with the high theoretical capacity of the Si core (4200 mA h g), the double shells can perfectly avoid direct contact of Si with electrolyte, leading to stable SEI films and enhanced Coulombic efficiency. On the other hand, the carbon inner shell is effective at improving the overall conductivity of the Si-based electrode; the TiO outer shell is expected to serve as a rigid layer to achieve high structural stability and integrity of the core-shell-shell structure. As a result, the elaborate Si@C@TiO core-shell-shell nanoparticles are proven to show excellent Li storage properties. It delivers high reversible capacity of 1726 mA h g over 100 cycles, with outstanding cyclability of 1010 mA h g even after 710 cycles.

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“…This approach has been successfully applied by our group for the elaboration of silicon with a shell of hollow γ-Fe 2 O 3 nanoparticles by reacting an organometallic precursor Fe(CO) 5 with Si nanopowder. This specific morphology results in an enhancement of the specific capacity from 2000 mAh/g of Si up to 2600 mAh/g of Si. − …”

Section: Introductionmentioning

confidence: 99%

Lithiation Kinetics in Silicon/Mn₃O₄ Core–Shell Nanoparticles Anodes for Li-Ion Battery

2019

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Silicon is predicted to become a significant component of high energy density Li-ion anodes. Mn-based cathodes for Li-ion batteries have been widely investigated in past years and Mn dissolution into the electrolyte, migration, and deposition on the anode's solid electrolyte interphase present a major challenge. In this work, we intentionally synthesize manganese oxide with several nanoscale thicknesses on a Si nanomaterial and follow the electrochemical behavior of the core−shell nanoparticles as Li-ion anode. The structure of the nanocomposites is investigated using highresolution scanning electron microscopy, high-resolution transition electron microscopy, X-ray diffraction, and electron paramagnetic resonance. The synthesis yields uniform nanoshells of Mn 3 O 4 haussmanite phase. We demonstrate that the haussmanite phase is electrochemically active, and its presence improves the lithiation process during cycling. This study reveals that the formation of a thin shell of manganese oxide phase on Si anode can improve the lithiation kinetics of the Si nanomaterials, while a thicker shell slows down the kinetics. In summary, to a certain extent, the contamination of Si anode materials from Mn-based cathodic materials could have a positive impact on their electrochemical behavior.

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Silicon/Hollow γ-Fe₂O₃ Nanoparticles as Efficient Anodes for Li-Ion Batteries

Cited by 40 publications

References 26 publications

Synthesis of Carbon Nanotubes Networks Grown on Silicon Nanoparticles as Li-Ion Anodes

Synthesis of Carbon Nanotubes Networks Grown on Silicon Nanoparticles as Li-Ion Anodes

Silicon/Mesoporous Carbon/Crystalline TiO₂ Nanoparticles for Highly Stable Lithium Storage

Lithiation Kinetics in Silicon/Mn₃O₄ Core–Shell Nanoparticles Anodes for Li-Ion Battery

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Silicon/Hollow γ-Fe2O3 Nanoparticles as Efficient Anodes for Li-Ion Batteries

Cited by 40 publications

References 26 publications

Synthesis of Carbon Nanotubes Networks Grown on Silicon Nanoparticles as Li-Ion Anodes

Synthesis of Carbon Nanotubes Networks Grown on Silicon Nanoparticles as Li-Ion Anodes

Silicon/Mesoporous Carbon/Crystalline TiO2 Nanoparticles for Highly Stable Lithium Storage

Lithiation Kinetics in Silicon/Mn3O4 Core–Shell Nanoparticles Anodes for Li-Ion Battery

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Silicon/Hollow γ-Fe₂O₃ Nanoparticles as Efficient Anodes for Li-Ion Batteries

Silicon/Mesoporous Carbon/Crystalline TiO₂ Nanoparticles for Highly Stable Lithium Storage

Lithiation Kinetics in Silicon/Mn₃O₄ Core–Shell Nanoparticles Anodes for Li-Ion Battery