Stepwise carbon growth on Si/SiOx core-shell nanoparticles and its effects on the microstructures and electrochemical properties for high-performance lithium-ion battery’s anode

Hoeltgen, Claude; Lee, Jeong Eun; Jang, Byung Koog

doi:10.1016/j.electacta.2016.11.006

Cited by 18 publications

(10 citation statements)

References 27 publications

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“…To investigate the electrochemical properties of the graphene sheet-unmodified and -modified Si/SiO x /C, CV curves of the initial three cycles were collected. As mentioned in Figure a, two broad cathodic peaks at 1.12 and 0.67 V can be observed in the first cycle, which are related to the electrolyte disintegration and SEI film formation, and the two cathodic peaks vanished in the following cycles, indicating that a stable SEI film has been generated on the interface of Si/SiO x /C/Gr. The cathodic/anodic peak occurred at 0.1–0.3 V, which is associated with Li + intercalation to the carbon materials, the reduction of SiO x , and Li–Si alloying .…”

Section: Resultsmentioning

confidence: 74%

Rational Design and Performance of Ansode Materials Based on Si/SiO_x/C Particles Anchored on Graphene Sheets

Peng

et al. 2021

ACS Appl. Energy Mater.

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Silicon (Si) is known as an advanced anode material in the application of high-energy lithium-ion batteries (LIBs). However, Si-based anodes still face many challenges in practical applications, such as larger volume expansion, poor conductivity, and knotty solid electrolyte interphase films. Enormous efforts are committed to design and develop the Si/C composites with special structures and morphologies in order to overcome the above deficiencies of Si-based anode materials. Herein, the silicon/ silicon oxide/carbon/graphene (Si/SiO x /C/Gr) composite is deliberately designed and synthesized by the magnesiothermic reduction and freeze-drying strategies in which the resorcinol-formaldehyde resin (RF) is used as the carbon source. Moreover, amorphous SiO x and carbon are embedded around the Si nanodomains, which can overcome the bulk change of Si anodes during cycling processes. At the same time, graphene (Gr) can further boost the conductivity of the anode and maintain a stable electrode. Accordingly, the Si/SiO x /C/Gr anode exhibits good cycling performance in LIBs, e.g., a first discharge capacity of 1180 mAh g −1 with an initial Coulombic efficiency of 65.4% and a retention rate of 79.5% after 200 cycles at 0.3 A g −1 , indicating that the Si-based anodes through the rational designing structure and morphology will have good application prospects in high-energy density LIBs.

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Section: Resultsmentioning

confidence: 74%

Rational Design and Performance of Ansode Materials Based on Si/SiO_x/C Particles Anchored on Graphene Sheets

Peng

et al. 2021

ACS Appl. Energy Mater.

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“…For the purpose of enhancing the conductivity of Si or SiO x materials, various strategies have been developed. Typically, heteroatom (such as boron) doping has been reported as a powerful strategy to enhance the electronic and ionic conductivity of Si and SiO x in LIBs. − Another effective way is surface modification/engineering by using highly conductive materials . Besides the commonly carbonous materials, transition-metal nitrides (TMNs) have been widely used in LIBs as supporting materials to improve the electrical conductivity of other electrode materials because of their high electrical conductivity. , Among TMNs, vanadium nitride (VN) shows many fascinating advantages such as high electronic conductivity (1.17 × 10 6 S cm –1 ), high theoretical capacity (1043 mA h g –1 ), and robust chemical stability. ,− Unfortunately, the huge volume change of VN during the cycling process will deteriorate its cycling stability.…”

Section: Introductionmentioning

confidence: 99%

Hollow Boron-Doped Si/SiO_x Nanospheres Embedded in the Vanadium Nitride/Nanopore-Assisted Carbon Conductive Network for Superior Lithium Storage

Zhang

Huang

Shen

et al. 2019

ACS Appl. Mater. Interfaces

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SiO x -based anode materials with high capacity and outstanding cycling performance have gained numerous attentions. Nevertheless, the poor electrical conductivity and non-negligible volume change hinder their further application in Li-ion batteries. Herein, we propose a new strategy to construct a hollow nanosphere with boron-doped Si/SiO x decorated with vanadium nitride (VN) nanoparticles and embedded in a nitrogen-doped, porous, and partial graphitization carbon layer (B-Si/SiO x @VN/PC). Benefiting from such structural and compositional features, the B-Si/SiO x @VN/PC electrode exhibits a stable cycling capacity of 1237.1 mA h g–1 at a current density of 0.5 A g–1 with an appealing capacity retention of 87.0% after 300 cycles. Additionally, it delivers high-rate capabilities of 1139.4, 940.7, and 653.4 mA h g–1 at current densities of 2, 5, and 10 A g–1, respectively, and ranks among the best SiO x -based anode materials. The outstanding electrochemical performance can be ascribed to the following reasons: (1) its hollow structure makes the Li+ transportation length decreased. (2) The existing nanopores facilitate the Li+ insertion/desertion and accommodate the volume variation. (3) The nitrogen-doped partial graphitization carbon enhances the electrical conductivity and promotes the formation of stable solid electrolyte interface layers during the repetitive Li+ intercalation/extraction process.

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“…Zheng's group 15 reported optimal thickness (~5 nm) of the coating layer for Si particles with a particle size of ~30 nm in terms of Li‐ion kinetics and mechanical stability at the interface. Synergistic effects originating from different Si valances in SiO x are gradually becoming a vitally important strategy for high‐performance Si‐based materials, in which Si valance can be mediated via self‐oxidation, 15 dismutate reaction, 16,17 or silicon reagents 18 …”

Section: Introductionmentioning

confidence: 99%

“…SiO x with different oxygen content demonstrates nonlinear phenomena in volume expansion, internal stress/strain, and SEI-film evolution upon performing a lithiated process. 14,20 Based on the reactive molecular dynamics simulations, Jung et al 21 elucidated the lithiation mechanism and stress distribution of SiO x during lithiation. Although the dependence of the Li-ion kinetic on stress/strain has been extensively investigated theoretically, the underlying mechanism of improved performances behind optimized Si valence should be further clarified in terms of stress relief and Si-valance distribution.…”

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confidence: 99%

Boosting the cell performance of the SiO_x@C anode material via rational design of a Si‐valence gradient

et al. 2021

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Relieving the stress or strain associated with volume change is highly desirable for high-performance SiO x anodes in terms of stable solid electrolyte interphase (SEI)-film growth. Herein, a Si-valence gradient is optimized in SiO x composites to circumvent the large volume strain accompanied by lithium insertion/extraction. SiO x @C annealed at 850°C has a gentle Si-valence gradient along the radial direction and excellent electrochemical performances, delivering a high capacity of 506.9 mAh g −1 at 1.0 A g −1 with a high Coulombic efficiency of ~99.8% over 400 cycles. Combined with the theoretical prediction, the obtained results indicate that the gentle Si-valence gradient in SiO x @C is useful for suppressing plastic deformation and maintaining the inner connection integrity within the SiO x @C particle. Moreover, a gentle Si-valence gradient is expected to form a stress gradient and affect the distribution of dangling bonds, resulting in local stress relief during the lithiation/delithiation process and enhanced Li-ion kinetic diffusion. Furthermore, the lowest interfacial stress variation ensures a stable SEI film at the interface and consequently increases cycling stability. Therefore, rational design of a Si-valence gradient in SiO x can provide further insights into achieving high-performance SiO x anodes with large-scale production.

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Stepwise carbon growth on Si/SiOx core-shell nanoparticles and its effects on the microstructures and electrochemical properties for high-performance lithium-ion battery’s anode

Cited by 18 publications

References 27 publications

Rational Design and Performance of Ansode Materials Based on Si/SiO_x/C Particles Anchored on Graphene Sheets

Rational Design and Performance of Ansode Materials Based on Si/SiO_x/C Particles Anchored on Graphene Sheets

Hollow Boron-Doped Si/SiO_x Nanospheres Embedded in the Vanadium Nitride/Nanopore-Assisted Carbon Conductive Network for Superior Lithium Storage

Boosting the cell performance of the SiO_x@C anode material via rational design of a Si‐valence gradient

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Stepwise carbon growth on Si/SiOx core-shell nanoparticles and its effects on the microstructures and electrochemical properties for high-performance lithium-ion battery’s anode

Cited by 18 publications

References 27 publications

Rational Design and Performance of Ansode Materials Based on Si/SiOx/C Particles Anchored on Graphene Sheets

Rational Design and Performance of Ansode Materials Based on Si/SiOx/C Particles Anchored on Graphene Sheets

Hollow Boron-Doped Si/SiOx Nanospheres Embedded in the Vanadium Nitride/Nanopore-Assisted Carbon Conductive Network for Superior Lithium Storage

Boosting the cell performance of the SiOx@C anode material via rational design of a Si‐valence gradient

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Rational Design and Performance of Ansode Materials Based on Si/SiO_x/C Particles Anchored on Graphene Sheets

Rational Design and Performance of Ansode Materials Based on Si/SiO_x/C Particles Anchored on Graphene Sheets

Hollow Boron-Doped Si/SiO_x Nanospheres Embedded in the Vanadium Nitride/Nanopore-Assisted Carbon Conductive Network for Superior Lithium Storage

Boosting the cell performance of the SiO_x@C anode material via rational design of a Si‐valence gradient