Synergistic protection of Si anode based on multi-dimensional graphitic carbon skeletons

Shi, Qitao; Wang, Haiming; Zhou, Junhua; Ta, Huy Q.; Wang, Jiaqi; Lian, Xueyu; Kurtyka, Klaudia; Trzebicka, Barbara; Gemming, Thomas; Rümmeli, Mark H.

doi:10.1007/s12274-022-4518-9

Cited by 23 publications

(7 citation statements)

References 57 publications

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“…An irreversible reduction peak at below 0.1 V was observed during the first cathodic scanning but disappeared in the subsequent cycles, which is attributed to the lithiation of the crystalline Si to generate a Li‐Si alloy. [ 42 ] The Li‐Si alloy is delithiated to amorphous Si during the first anodic scanning, resulting in two oxidation peaks at ≈0.4 and 0.52 V. In addition, the reduction peaks that shift to 0.2 V in the subsequent cycles correspond to the transformation of amorphous Si to Li x Si, indicating that crystalline Si cannot be regenerated from the Li‐Si alloy during electrochemical oxidation. As a control, the SP@µSi anode shows similar electrochemical reactions in the first three cycles (Figure S6, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Strain Regulating and Kinetics Accelerating of Micro‐Sized Silicon Anodes via Dual‐Size Hollow Graphitic Carbons Conductive Additives

Shi

Cheng

Wang

et al. 2022

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Micro‐sized silicon (µSi) anode features fewer interfacial side reactions and lower costs compared to nanosized silicon, and has higher commercial value when applied as a lithium‐ion battery (LIB) anode. However, the high localized stress generated during (de)lithiation causes electrode breakdown and performance deterioration of the µSi anode. In this work, hollow graphitic carbons with tailored dual sizes are employed as conductive additives for the µSi anode to overcome electrode failure. The dual‐size hollow graphitic carbons (HGC) additives consist of particles with micrometer size similar to the µSi particles; these additives are used for strain regulation. Additionally, nanometer‐size particles similar to commercial carbon black Spheron (SP) are used mainly for kinetics acceleration. In addition to building an efficient conductive network, the dual‐size hollow graphitic carbon conductive additive prevents the fracture of the electrode by reducing local stress and alleviating volume expansion. The µSi anode with dual‐size hollow graphitic carbons as conductive additives achieves an impressive capacity of 651.4 mAh g−1 after 500 cycles at a high current density of 2 A g−1. These findings suggest that dual‐size hollow graphitic carbons are expected to be superior conductive additives for micro‐sized alloy anodes similar to µSi.

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Section: Resultsmentioning

confidence: 99%

Strain Regulating and Kinetics Accelerating of Micro‐Sized Silicon Anodes via Dual‐Size Hollow Graphitic Carbons Conductive Additives

Shi

Cheng

Wang

et al. 2022

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“…The various advantages of carbon-based materials have made the composite of silicon and carbon materials a major research direction. The results state clearly that proper porosity of HPC material can inhibit the volume change of Si during charging and discharging [142,143]. Secondly, the abundant channels can facilitate Li + transport and increase Li + reaction power, thus realizing further improvements in electrochemical performance [144].…”

Section: Multiphase Compositesmentioning

confidence: 94%

Hierarchical porous carbon materials for lithium storage: preparation, modification, and applications

Ying,

Yin,

Zhao

et al. 2024

Nanotechnology

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Secondary battery as an efficient energy conversion device have been highly attractive for alleviating the energy crisis and environmental pollution. Hierarchical porous carbon materials with multiple sizes pore channels are considered as promising materials for energy conversion and storage applications, due to their high specific surface area and excellent electrical conductivity. Although many reviews have reported on carbon materials for different fields, systematic summaries about hierarchical porous carbon materials for lithium storage are still rare. In this review, we fist summarize the main preparation methods of hierarchical porous carbon materials, including hard template method, soft template method, and template-free method. The modification methods including porosity and morphology tuning, heteroatom doping, and multiphase composites are introduced systematically. Then, the recent advances in hierarchical porous carbon materials on lithium storage are summarized. Finally, we outline the challenges and future perspectives for the application of hierarchical porous carbon materials in lithium storage.

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“…52,53 It shows that SGCC has a relatively high ratio of pseudocapacitive contribution at various scan rates, which may be ascribed to the large specific surface area of Si nanoparticles, as well as porous carbon components that possess supercapacitive behaviors. 54,55 Moreover, the galvanostatic intermittent titration technique (GITT) was also carried out to analyze the Li-ion diffusivity of each sample, as shown in Figure S9, which proves the improvement of Li-ion diffusion kinetics after the introduction of graphene nanosheets.…”

Section: ■ Introductionmentioning

confidence: 92%

Graphene-Wrapped Composites of Si Nanoparticles, Carbon Nanofibers, and Pyrolytic Carbon as Anode Materials for Lithium-Ion Batteries

Hong

Zhang

et al. 2023

ACS Appl. Nano Mater.

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Silicon (Si) anode materials have received much attention on account of their unparalleled theoretical specific capacity, but they suffer from huge volumetric expansion and particle pulverization, which leads to rapid capacity fading and poor electrical conductivity as well. In this work, a quaternary silicon/carbon (Si/C) composite anode material is proposed which combines the advantages of both graphene and the three-dimensional carbon framework through rational structural design and simple synthesis methods. Nanosilicon/carbon nanofibers/ pyrolytic carbon (SCC) composite particles are first synthesized by spray drying and pyrolysis, which are then wrapped by graphene nanosheets through a second spray drying and pyrolysis process to obtain the final product (SGCC). In this composite, a 3D carbon skeleton composed of carbon nanofibers and pyrolytic carbon serves as an electric conductive matrix that supports and stabilizes Si nanoparticles, while graphene nanosheets wrapped on the surface further improve the conductivity and structure stability of the composite particles, and isolate the particles from direct contact with electrolytes. Meanwhile, the rich pores of the composite particles can effectively provide space for the volume expansion of Si during lithiation. As a consequence, the asprepared SGCC composite shows a high initial Coulomb efficiency of 84.7%, a high reversible capacity of 2150.8 mA h g −1 , and a good capacity retention rate of 83.75% after 100 cycles.

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Synergistic protection of Si anode based on multi-dimensional graphitic carbon skeletons

Cited by 23 publications

References 57 publications

Strain Regulating and Kinetics Accelerating of Micro‐Sized Silicon Anodes via Dual‐Size Hollow Graphitic Carbons Conductive Additives

Strain Regulating and Kinetics Accelerating of Micro‐Sized Silicon Anodes via Dual‐Size Hollow Graphitic Carbons Conductive Additives

Hierarchical porous carbon materials for lithium storage: preparation, modification, and applications

Graphene-Wrapped Composites of Si Nanoparticles, Carbon Nanofibers, and Pyrolytic Carbon as Anode Materials for Lithium-Ion Batteries

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