Self-supporting N, P doped Si/CNTs/CNFs composites with fiber network for high-performance lithium-ion batteries

Gao, Mingyue; Tang, Zehua; Wu, Mengrong; Chen, Jiale; Xue, Yanchun; Guo, Xingmei; Liu, Yuanjun; Kong, Qinghong; Zhang, Junhao

doi:10.1016/j.jallcom.2020.157554

Cited by 64 publications

(21 citation statements)

References 36 publications

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“…The peaks at 1,340 and 1,601 cm −1 are assigned to D band and G band in carbon. The ratio of D-band peak to G-band peak (ID/IG) corresponding to the comparable proportion of sp 3 and sp 2 hybridization can evaluate the degree of graphitization of the BWC, and it is estimated as 0.874, indicating a high degree of graphitization with high electrical conductivity [28]. The internal pore characteristics of Z-Co2NiSe4/BWC were also detected via N2 adsorption-desorption isotherm in Fig.…”

Section: Resultsmentioning

confidence: 99%

Zephyranthes-like Co2NiSe4 arrays grown on 3D porous carbon frame-work as electrodes for advanced supercapacitors and sodium-ion batteries

Xue

Guo

et al. 2021

Nano Res.

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Developing suitable electrode materials for electrochemical energy storage devices by biomorph assisted design has become a fascinating topic due to the fantastic properties derived from bio-architectures. Herein, zephyranthes-like Co 2 NiSe 4 arrays grown on butterfly wings derived three-dimensional (3D) carbon framework (Z-Co 2 NiSe 4 /BWC) is fabricated via hydrothermal assembly and further conversion method. Benefiting from its unique structure and multi-components, the obtained Z-Co 2 NiSe 4 /BWC electrode for supercapacitor delivers an excellent specific capacitance of 2,280 F•g −1 at 1 A•g −1 . Impressively, the constructed asymmetric supercapacitor using Co 2 NiSe 4 /BWC as positive electrode and activated butterfly wings carbon as negative electrode acquires a high energy density of 42.9 Wh•kg −1 at a power density of 800 W•kg −1 with robust stability of 94.6% capacitance retention at 10 A•g −1 after 5,000 cycles. Moreover, the Z-Co 2 NiSe 4 /BWC as anode for sodium-ion batteries exhibits a high specific capacity of 568 mAh•g −1 at 0.1 A•g −1 and high cycling stability (maintaining 80.1% of the second cycle after 100 cycles). The outstanding electrochemical performances are ascribed to that the synergistic effect of bimetallic selenides and N-doped carbon improves electrochemical activities and conductivity. One-dimensional (1D) nanoneedles grown on 3D porous framework increase the exposure of redox-active sites, endow adequate transmission channels of electrons/ions, and guarantee stability of the electrode during charge/discharge processes. This study will shed light on the avenue towards extending such nanohybrids to excellent energy storage applications.

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Section: Resultsmentioning

confidence: 99%

Zephyranthes-like Co2NiSe4 arrays grown on 3D porous carbon frame-work as electrodes for advanced supercapacitors and sodium-ion batteries

Xue

Guo

et al. 2021

Nano Res.

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“…Acetone was added to the core spinning solution because PAN can precipitate in acetone solution. Thus, even if the core and shell solution meet after being ejected from the needle, the PAN precipitates at the interface of core and shell of fibers, which prevent Si nanoparticles in the core solution from entering the shell region and ensure the synthesis of the core–shell Si/C fibers . After carbonization, flexible self-supporting Si/C composites were obtained.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, even if the core and shell solution meet after being ejected from the needle, the PAN precipitates at the interface of core and shell of fibers, which prevent Si nanoparticles in the core solution from entering the shell region and ensure the synthesis of the core−shell Si/C fibers. 16 After carbonization, flexible self-supporting Si/C composites were obtained. A test of the flexibility of the SC-NF-0.24 anode is shown in the upper right part of Figure 1.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Encapsulating Nanoscale Silicon inside Carbon Fiber as Flexible Self-Supporting Anode Material for Lithium-Ion Battery

Peng

et al. 2021

ACS Appl. Energy Mater.

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At present, the main limitations for the practical application of silicon (Si) as an anode material of a lithium-ion battery are huge volume variation and low electrical conductivity. Core–shell silicon/carbon (Si/C) composites can greatly relieve the Si large volume change and accelerate the low Li+ conductivity; however, cracking of carbon shell and the failure of the electrode structure still limit the lithium storage capability and cyclic life. Herein, a flexible freestanding N-doped core–shell Si/C nanofiber (SC-NF) anode is prepared by the double-nozzle electrospinning technique. It has been found that in such fibers, Si particles are encapsulated by the carbon shell of fibers, which can settle the shortcomings of pulverization and volume variation of Si. Furthermore, the highly conductive N–C shell derived from carbonized PAN can accelerate the diffusion of Li+ and charge transport. As a result, the as-prepared core–shell SC-NF-0.24 electrode exhibits an initial specific discharge capacity of 1441 mAh g–1 with a high capacity retention of 76.9% at 0.5 A g–1, and the capacity decay rate of per cycle is only 0.1% (starting on the third cycle), showing a good cycle property. Therefore, the as-prepared freestanding core–shell SC-NF material is a prospective anode material for high-performance lithium-ion batteries.

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“…39 In summary, the N,S-doped carbon layer can increase its conductivity and relieve the volume change during the delithiation/lithiation process. 40 The hierarchical porous structure can facilitate the diffusion of Li + in electrolyte, and the high surface area and small particle size can promote the reaction kinetics and reduce the diffusion length of Li + in solids. These properties make the Si@NSC composites a promising anode material for high-performance LIBs.…”

Section: Resultsmentioning

confidence: 99%

An Anode Material for Lithium Storage: Si@N,S-Doped Carbon Synthesized via In Situ Self-Polymerization

Wang

et al. 2021

ACS Appl. Energy Mater.

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Silicon is one of the most promising candidates for anode materials for next-generation lithium-ion batteries due to its high theoretical capacity. However, the catastrophic volume change upon lithiation/delithiation and the subsequent pulverization result in poor electrochemical performance and hinder its applications. To address this issue, a Si@N,S-doped carbon core–shell structure (Si@NSC) is proposed in this work. The composites are prepared by in situ polymerization and pyrolysis. The as-prepared Si@NSC electrode exhibits a stable capacity of 1720 mAh g–1 at 0.3 A g–1 after 550 cycles with a capacity retention of 90.2%. Compared with commercial silicon and a mixture of Si and C, Si@NSC demonstrates high initial efficiency and superior cyclic stability owing to its unique structure and moderate Si/C ratio. The Si@NSC composites shed light on the application of Si-based anode materials for high-capacity lithium storage.

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Self-supporting N, P doped Si/CNTs/CNFs composites with fiber network for high-performance lithium-ion batteries

Cited by 64 publications

References 36 publications

Zephyranthes-like Co2NiSe4 arrays grown on 3D porous carbon frame-work as electrodes for advanced supercapacitors and sodium-ion batteries

Zephyranthes-like Co2NiSe4 arrays grown on 3D porous carbon frame-work as electrodes for advanced supercapacitors and sodium-ion batteries

Encapsulating Nanoscale Silicon inside Carbon Fiber as Flexible Self-Supporting Anode Material for Lithium-Ion Battery

An Anode Material for Lithium Storage: Si@N,S-Doped Carbon Synthesized via In Situ Self-Polymerization

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