Tailored silicon hollow spheres with Micrococcus for Li ion battery electrodes

Yi, Yang; Lee, Gwang Hee; Kim, Jae Chan; Shim, Hyun Woo; Kim, Dong Wan

doi:10.1016/j.cej.2017.06.103

Cited by 37 publications

(13 citation statements)

References 52 publications

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“…Raman in Figure 2f shows the broadening silicon peak at 400–500 cm −1 and 800–900 cm −1 [36]. In these Raman spectra, the D-band is located at 1340 cm −1 to characterize the defects of carbon atomic crystals and the G-band is located at 1556 cm −1 to characterize the plane expansion vibration of carbon atom SP2 hybrid [37,38]. The intensity ratio I D /I G close to 1 further shows the low degree of graphitization of Si@C anode material.…”

Section: Resultsmentioning

confidence: 99%

POSS-Derived Synthesis and Full Life Structural Analysis of Si@C as Anode Material in Lithium Ion Battery

Bai

Zhu

et al. 2019

Polymers

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Polyhedral oligomeric silsesquioxane (POSS)-derived Si@C anode material is prepared by the copolymerization of octavinyl-polyhedral oligomeric silsesquioxane (octavinyl-POSS) and styrene. Octavinyl-polyhedral oligomeric silsesquioxane has an inorganic core (-Si8O12) and an organic vinyl shell. Carbonization of the core-shell structured organic-inorganic hybrid precursor results in the formation of carbon protected Si-based anode material applicable for lithium ion battery. The initial discharge capacity of the battery based on the as-obtained Si@C material Si reaches 1500 mAh g−1. After 550 charge-discharge cycles, a high capacity of 1430 mAh g−1 was maintained. A combined XRD, XPS and TEM analysis was performed to investigate the variation of the discharge performance during the cycling experiments. The results show that the decrease in discharge capacity in the first few cycles is related to the formation of solid electrolyte interphase (SEI). The subsequent rise in the capacity can be ascribed to the gradual morphology evolution of the anode material and the loss of capacity after long-term cycles is due to the structural pulverization of silicon within the electrode. Our results not only show the high potential of the novel electrode material but also provide insight into the dynamic features of the material during battery cycling, which is useful for the future design of high-performance electrode material.

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Section: Resultsmentioning

confidence: 99%

POSS-Derived Synthesis and Full Life Structural Analysis of Si@C as Anode Material in Lithium Ion Battery

Bai

Zhu

et al. 2019

Polymers

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“…The utilization of silicon (Si) has become recognized as an alternative anode to replace the conventional graphite because of its high specific capacity of 3579 mAh g –1 for achieving high-energy lithium-ion batteries (LIBs). − However, a huge volume change (300%) during (de)alloying with lithium, which sparks the mechanical failure including cracking and pulverization, has been regarded as a main obstacle for practical application of Si anodes in LIBs. − Among the various strategies to alleviate the large volume change of Si-based anodes, void engineering has been highlighted because its free volume accommodates volume expansion of Si during lithiation. − Such sufficient free volume takes advantage of stable SEI layer formation with reduced mechanical failure and stable electrochemical behavior in repeated expansion/retraction. − …”

mentioning

confidence: 99%

Scalable Synthesis of Hollow β-SiC/Si Anodes via Selective Thermal Oxidation for Lithium-Ion Batteries

et al. 2020

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Silicon for anodes in lithium-ion batteries has received much attention owing to its superior specific capacity. There has been a rapid increase of research related to void engineering to address the silicon failure mechanism stemming from the massive volume change during (dis)charging in the past decade. Nevertheless, conventional synthetic methods require complex synthetic procedures and toxic reagents to form a void space, so they have an obvious limitation to reach practical application. Here, we introduce SiC x consisting of nanocrystallite Si embedded in the inactive matrix of β-SiC to fabricate various types of void structures using thermal etching with a scalable one-pot CVD method. The structural features of SiC x make the carbonaceous template possible to be etched selectively without Si oxidation at high temperature with an air atmosphere. Furthermore, bottom-up gas phase synthesis of SiC x ensures atomically identical structural features (e.g., homogeneously distributed Si and β-SiC) regardless of different types of sacrificial templates. For these reasons, various types of SiC x hollow structures having shells, tubes, and sheets can be synthesized by simply employing different morphologies of the carbon template. As a result, the morphological effect of different hollow structures can be deeply investigated as well as the free volume effect originating from void engineering from both a electrochemical and computational point of view. In terms of selective thermal oxidation, the SiC x hollow shell achieves a much higher initial Coulombic efficiency (>89%) than that of the Si hollow shell (65%) because of its nonoxidative property originating from structural characteristics of SiC x during thermal etching. Moreover, the findings based on the clearly observed different electrochemical features between half-cell and full-cell configuration give insight into further Si anode research.

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“…To stabilize SEI film, carbon has been used widely in the coating of silicon particles due to its good electronic and mechanical properties. Carbon coating controls the pulverization of silicon particles and prevents direct contact of the electrolyte with silicon particles (Yi et al, 2017 ). By leaving interior voids, unfilled pSiMPs was coated with carbon as shown in Figure 4 .…”

Section: Applications Of Silicon-based Porous Nanomaterialsmentioning

confidence: 99%

Big Potential From Silicon-Based Porous Nanomaterials: In Field of Energy Storage and Sensors

et al. 2018

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Silicon nanoparticles (SiNPs) are the promising materials in the various applications due to their unique properties like large surface area, biocompatibility, stability, excellent optical and electrical properties. Surface, optical and electrical properties are highly dependent on particle size, doping of different materials and so on. Porous structures in silicon nanomaterials not only improve the specific surface area, adsorption, and photoluminescence efficiency but also provide numbers of voids as well as the high surface to volume ratio and enhance the adsorption ability. In this review, we focus on the significance of porous silicon/mesoporous silicon nanoparticles (pSiNPs/mSiNPs) in the applications of energy storage, sensors and bioscience. Silicon as anode material in the lithium-ion batteries (LIBs) faces a huge change in volume during charging/discharging which leads to cracking, electrical contact loss and unstable solid electrolyte interphase. To overcome challenges of Si anode in the LIBs, mSiNPs are the promising candidates with different structures and coating of different materials to enhance electrochemical properties. On the basis of optical properties with tunable wavelength, pSiNPs are catching good results in biosensors and gas sensors. The mSiNPs with different structures and modified surfaces are playing an important role in the detection of biomarkers, drug delivery and diagnosis of cancer and tumors.

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Tailored silicon hollow spheres with Micrococcus for Li ion battery electrodes

Cited by 37 publications

References 52 publications

POSS-Derived Synthesis and Full Life Structural Analysis of Si@C as Anode Material in Lithium Ion Battery

POSS-Derived Synthesis and Full Life Structural Analysis of Si@C as Anode Material in Lithium Ion Battery

Scalable Synthesis of Hollow β-SiC/Si Anodes via Selective Thermal Oxidation for Lithium-Ion Batteries

Big Potential From Silicon-Based Porous Nanomaterials: In Field of Energy Storage and Sensors

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