A facile fabrication of micro/nano-sized silicon/carbon composite with a honeycomb structure as high-stability anodes for lithium-ion batteries

Xie, Qinxing; Qu, Shipeng; Zhao, Peng

doi:10.1016/j.jelechem.2021.115074

Cited by 29 publications

(12 citation statements)

References 53 publications

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“…The volume expansion of lithiation was effectively eliminated. Xie et al [21] encapsulated the micro/nano-sized silicon particles into a nitrogen-enriched porous carbon matrix, using CaCO 3 as the structural template and polyacrylonitrile (PAN) as the carbon and nitrogen source. The resultant honeycomb shaped porous composites exhibited a dramatically enhanced cycling stability and excellent rate performance, which could well adapt the volume expansion of the lithiation/delithiation process.…”

Section: Introductionmentioning

confidence: 99%

The Size Effects of Point Defect on the Mechanical Properties of Monocrystalline Silicon: A Molecular Dynamics Study

Wan

Tang

et al. 2021

Materials

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The molecular dynamics method was used to simulate the fracture process of monocrystalline silicon with different sizes of point defect under a constant strain rate. The mechanism of the defect size on the mechanical properties of monocrystalline silicon was also investigated. The results suggested that the point defect significantly reduces the yield strength of monocrystalline silicon. The relationships between the yield strength variation and the size of point defect fitted an exponential function. By statistically analyzing the internal stress in monocrystalline silicon, it was found that the stress concentration induced by the point defect led to the decrease in the yield strength. A comparison between the theoretical strength given by the four theories of strength and actual strength proved that the Mises theory was the best theory of strength to describe the yield strength of monocrystalline silicon. The dynamic evolution process of Mises stress and dislocation showed that the fracture was caused by the concentration effect of Mises stress and dislocation slip. Finally, the fractured microstructures were similar to a kind of two-dimensional grid which distributed along the cleavage planes while visualizing the specimens. The results of this article provide a reference for evaluating the size effects of point defects on the mechanical properties of monocrystalline silicon.

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Section: Introductionmentioning

confidence: 99%

The Size Effects of Point Defect on the Mechanical Properties of Monocrystalline Silicon: A Molecular Dynamics Study

Wan

Tang

et al. 2021

Materials

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“…The high-resolution O 1s spectrum (Figure d) can be fitted into two peaks at 532.9 and 531.8 eV that are related to Si–O and Al–O bonds, , respectively, which further confirms the presence of Al 2 O 3 in the composite. The high-resolution Si 2p spectrum (Figure e) can be fitted into a total of three peaks; one peak at 99.8 eV can be attributed to Si–Si bonds, and the other two peaks at 103.7 and 102.9 eV are mainly due to the oxidized surface of silicon . The Al 2p spectrum (Figure f) exhibits a typical peak located at around 74.7 eV.…”

Section: Resultsmentioning

confidence: 96%

“…The high-resolution Si 2p spectrum (Figure 3e) can be fitted into a total of three peaks; one peak at 99.8 eV can be attributed to Si−Si bonds, and the other two peaks at 103.7 and 102.9 eV are mainly due to the oxidized surface of silicon. 20 The Al 2p spectrum (Figure 3f) exhibits a typical peak located at around 74.7 eV.…”

Section: ■ Results and Discussionmentioning

confidence: 97%

“…By contrast, micro- or submicrosized silicon particles are more competitive in price, however, to our knowledge, which undergo much more significant volume variation. , To alleviate this problem, various approaches and strategies have been proposed and can be classified into four categories, including (1) application of novel binders with a 3D cross-linked network and/or self-healing features, (2) further particle refinement by high energy ball-milling, , (3) rational encapsulation of silicon in carbon matrices forming special porous structures, such as yolk–shell Si/C composites, , (4) fabrication of porous silicon by acid-etching of silicon alloys or by magnesiothermic reduction of porous silica . It has been proved that porous silicon is very stable as anodes; however, this methodology does not show obvious experimental friendliness due to a large quantity of etching acids used.…”

Section: Introductionmentioning

confidence: 99%

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Ball-Milled Silicon with Amorphous Al₂O₃/C Hybrid Coating Embedded in Graphene/Graphite Nanosheets with a Boosted Lithium Storage Capability

et al. 2022

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Electrochemical active silicon has attracted great attention as anodes for lithium-ion batteries owing to a high theoretical capacity of 4200 mA h g −1 . In this work, ball-milled silicon particles with submicron size were strategically modified with a hybrid coating of amorphous alumina and carbon, which simultaneously embedded in a porous framework of in situ exfoliated graphene/graphite nanosheets (GGN). The composite exhibits an enhanced electrochemical performance, including high cycling stability and superior rate capability. An initial discharge capacity of 1294 mA h g −1 and a reversible charge capacity of 1044 mA h g −1 at 0.2 A g −1 can be achieved with a high initial Coulombic efficiency of up to ca. 81%. Additionally, the composite can remain 902 mA h g −1 after 100 discharge/charge cycles, accounting for a high retention of about 86%. This silicon composite is a promising anode material for high performance lithium-ion batteries with a high energy density, and the facile one-pot fabrication route is low cost and scalable, with a great prospect for practical application.

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“…Xie et al tried encapsulating silicon nanopowders into a nitrogenenriched porous carbon matrix using CaCO 3 . This yielded in improved battery performance where the battery retained 81% of its capacity after 200 cycles [11]. Other groups used 2D graphene to enhance the conductivity between the anode particles.…”

Section: Introductionmentioning

confidence: 99%

BaTiO₃‐doped silicon nanocomposite anodes capacity enhancement for ultra‐high capacity rechargeable lithium‐ion batteries

Amli

Walwyn

Ahmed

2021

The Journal of Engineering

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Silicon anodes are vital for the next generation ultra-high capacity rechargeable lithium-ion batteries. This study investigates ultrasmall silicon nanopowder (30-40 nm) as an anode material. Its high capacity > 3700 mAh/g makes it attractive, given the current theoretical capacity of graphite is ten times lower (370 mAh/g). However, it has severe instability due to volume expansion of silicon particles during charging. Hence, BaTiO 3 nanomaterial was used to stabilise the cycling ability and improve the capacity. This study showed that silicon anode with BaTiO 3 retained 40% of its original capacity after the 100th cycle where the silicon anode without BaTiO 3 lost almost all of its capacity. The silicon anode with BaTiO 3 also managed to regain and sustain ∼800 mAh/g of its capacity at slow charging rate compared to the silicon anode without BaTiO 3 . Water was used as a solvent and the basic changes in oxidation states of the silicon anode were investigated using X-ray photoemission spectroscopy and proved the creation of CO x at different rates of repeated cycling. The work also provides detailed mapping of the different stages as the silicon nanopowder undergoes cycling. It provides a simple and effective way of synthesising and testing nearly pure silicon anodes.

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A facile fabrication of micro/nano-sized silicon/carbon composite with a honeycomb structure as high-stability anodes for lithium-ion batteries

Cited by 29 publications

References 53 publications

The Size Effects of Point Defect on the Mechanical Properties of Monocrystalline Silicon: A Molecular Dynamics Study

The Size Effects of Point Defect on the Mechanical Properties of Monocrystalline Silicon: A Molecular Dynamics Study

Ball-Milled Silicon with Amorphous Al₂O₃/C Hybrid Coating Embedded in Graphene/Graphite Nanosheets with a Boosted Lithium Storage Capability

BaTiO₃‐doped silicon nanocomposite anodes capacity enhancement for ultra‐high capacity rechargeable lithium‐ion batteries

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A facile fabrication of micro/nano-sized silicon/carbon composite with a honeycomb structure as high-stability anodes for lithium-ion batteries

Cited by 29 publications

References 53 publications

The Size Effects of Point Defect on the Mechanical Properties of Monocrystalline Silicon: A Molecular Dynamics Study

The Size Effects of Point Defect on the Mechanical Properties of Monocrystalline Silicon: A Molecular Dynamics Study

Ball-Milled Silicon with Amorphous Al2O3/C Hybrid Coating Embedded in Graphene/Graphite Nanosheets with a Boosted Lithium Storage Capability

BaTiO3‐doped silicon nanocomposite anodes capacity enhancement for ultra‐high capacity rechargeable lithium‐ion batteries

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Product

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Ball-Milled Silicon with Amorphous Al₂O₃/C Hybrid Coating Embedded in Graphene/Graphite Nanosheets with a Boosted Lithium Storage Capability

BaTiO₃‐doped silicon nanocomposite anodes capacity enhancement for ultra‐high capacity rechargeable lithium‐ion batteries