Enhanced electrochemical performances of silicon nanotube bundles anode coated with graphene layers

Chen, Jingjing; Bie, Li–Jian; Sun, Jing; Xu, Fangfang

doi:10.1016/j.materresbull.2015.09.028

Cited by 16 publications

(7 citation statements)

References 25 publications

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“…The branched Si anode retained capacity of 654 mAh g −1 even at a high rate of 2 C, which was improved compared with other 1D nano-sized Si anodes. [34][35][36] The improvement indicated more efficient electron and Li ion transport in the branches with interconnected and interspaced secondary dendrites. However, the low intrinsic conductivity of Si caused rapid capacity fading down to 125 mAh g −1 at 3 C. The branched Si@C anode with conductive carbon layer exhibited enhanced capacities of 1055 mAh g −1 at 2 C and 813 mAh g −1 at 3 C, respectively.…”

Section: Electrochemical Performance Of the Branched Si And Si@c Anodesmentioning

confidence: 99%

“…[46] Table S1, Supporting Information, compares the electrochemical performance of our branched Si and Si@C anodes with other nano-sized Si anodes (1D nanostructures, nanoparticles etc.). [6,[34][35][36][47][48][49][50][51][52] Both the branched Si and Si@C anodes showed improved capacity, rate performance, and cycling stability, demonstrating the advantages of the branched nanostructures.…”

Section: Electrochemical Performance Of the Branched Si And Si@c Anodesmentioning

confidence: 99%

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Facile and Efficient Fabrication of Branched Si@C Anode with Superior Electrochemical Performance in LIBs

Cao

Huang

Cui

et al. 2021

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One‐dimensional Si nanostructures with carbon coating (1D Si@C) show great potential in lithium ion batteries (LIBs) due to small volume expansion and efficient electron transport. However, 1D Si@C anode with large area capacity still suffers from limited cycling stability. Herein, a novel branched Si architecture is fabricated through laser processing and dealloying. The branched Si, composed of both primary and interspaced secondary dendrites with diameters under 100 nm, leads to improved area capacity and cycling stability. By coating a carbon layer, the branched Si@C anode shows gravimetric capacity of 3059 mAh g−1 (1.14 mAh cm−2). At a higher rate of 3 C, the capacity is 813 mAh g−1, which retained 759 mAh g−1 after 1000 cycles at 1 C. The area capacity is further improved to 1.93 mAh cm−2 and remained over 92% after 100 cycles with a mass loading of 0.78 mg cm−2. Furthermore, the full‐cell configuration exhibits energy density of 405 Wh kg−1 and capacity retention of 91% after 200 cycles. The present study demonstrates that laser‐produced dendritic microstructure plays a critical role in the fabrication of the branched Si and the proposed method provides new insights into the fabrication of Si nanostructures with facility and efficiency.

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Section: Electrochemical Performance Of the Branched Si And Si@c Anodesmentioning

confidence: 99%

Section: Electrochemical Performance Of the Branched Si And Si@c Anodesmentioning

confidence: 99%

Facile and Efficient Fabrication of Branched Si@C Anode with Superior Electrochemical Performance in LIBs

Cao

Huang

Cui

et al. 2021

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“…However, the thickness and number of layers of Graphene cannot be identified due to the limitation of SEM imaging. For example, a crumple surface of graphene sheet was visualized by SEM [89,94]. It was speculated that the winkled surface morphology indicated a relatively high surface area of graphene and contributed to the increase in electron conductivity, which resulted in an improved electrochemical performance [70,95].…”

Section: Graphene Qualitymentioning

confidence: 99%

“…The atomic force microscope (AFM) was utilized to measure the thickness of graphene nanosheets. Many of the fabricated Si/Graphene nanocomposites had graphene thickness of less than 10 nm [23,83,94]. However, AFM was not able to tell if the graphene was single layer due to molecules absorbed on the graphene surface.…”

Section: Graphene Qualitymentioning

confidence: 99%

Current Progress of Si/Graphene Nanocomposites for Lithium-Ion Batteries

Cen

Sisson

Qin

et al. 2018

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The demand for high performance lithium-ion batteries (LIBs) is increasing due to widespread use of portable devices and electric vehicles. Silicon (Si) is one of the most attractive candidate anode materials for next generation LIBs. However, the high-volume change (>300%) during lithium ion alloying/de-alloying leads to poor cycle life. When Si is used as the anode, conductive carbon is needed to provide the necessary conductivity. However, the traditional carbon coating method could not overcome the challenges of pulverization and unstable Solid Electrolyte Interphase (SEI) layer during long-term cycling. Since 2010, Si/Graphene composites have been vigorously studied in hopes of providing a material with better cycling performance. This paper reviews current progress of Si/Graphene nanocomposites in LIBs. Different fabrication methods have been studied to synthesize Si/Graphene nanocomposites with promising electrochemical performances. Graphene plays a key enabling role in Si/Graphene anodes. However, the desired properties of graphene for this application have not been systematically studied and understood. Further systematic investigation of the desired graphene properties is suggested to better control the Si/Graphene anode performance.

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“…There are a lot of reports on Si achieving a practical capacity of up to 3000 mAh/g, − but Si-based anodes are yet to be commercialized since cycle life and performance in full cells are poor. For instance, most reports show that very high-capacity values were obtained when using a high amount of inactive materials (binder and conductive additive can reach up to 50% of total electrode weight) and low electrode loading (<1 mg/cm 2 ), which cannot be adopted by industry. − The other major problem is poor reproducibility caused by using the “in-house”-made silicon with various morphologies (e.g., silicon nanowires, , silicon nanoparticles, porous silicon, , silicon nanosheets, silicon nanotubes, just to name a few) or commercial silicon available in low-batches only . However, it is obvious that only cheap commercial silicon with reproducible properties could be of interest to the battery industry.…”

Section: Introductionmentioning

confidence: 99%

Practical Approach to Enhance Compatibility in Silicon/Graphite Composites to Enable High-Capacity Li-Ion Battery Anodes

2021

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There is an urgent need to improve the energy density of Li-ion batteries to enable mass-market penetration of electric vehicles, grid-scale energy storage, and next-generation consumer electronics. Silicon–graphite composites are currently the most plausible anode material to overcome the capacity limit of graphite or poor cycling performance of silicon. One serious and unrecognized limitation to the use of the composite as an anode is the incompatibility of hydrophobic (natural) graphite with the hydrophilic Si, which adversely affects battery performance. Herein, we report a novel, practical approach to modify the graphite resulting in the formation of a hard carbon coating and graphene sheets that give rise to higher compatibility with Si nanoparticles in the composite. Electrochemical and battery testing of the composite (10 wt % Si) anode shows higher reversible capacity (10% at C/12 and 20% at C/2) than the composite with unmodified graphite reaching ∼600 mAh/g with 95% retention after 100 cycles. The enhanced battery performance is explained by the uniform distribution of Si nanoparticles at the modified graphite surface due to the presence of graphene conductive networks and a thin, oxygen-rich, amorphous carbon layer on the surface of graphite particles, as evidenced by transmission electron microscopy (TEM) images and X-ray photoelectron spectra (XPS). This work provides a new approach to prepare graphite compatible materials that can work with hydrophilic components other than silicon for various applications other than batteries.

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Enhanced electrochemical performances of silicon nanotube bundles anode coated with graphene layers

Cited by 16 publications

References 25 publications

Facile and Efficient Fabrication of Branched Si@C Anode with Superior Electrochemical Performance in LIBs

Facile and Efficient Fabrication of Branched Si@C Anode with Superior Electrochemical Performance in LIBs

Current Progress of Si/Graphene Nanocomposites for Lithium-Ion Batteries

Practical Approach to Enhance Compatibility in Silicon/Graphite Composites to Enable High-Capacity Li-Ion Battery Anodes

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