Facile preparation of nitrogen-doped yolk-shell Si@void@C/CNTs microspheres as high-performance anode in lithium-ion batteries

Gao, Yang; Qiu, Xiaotao; Wang, Xiuli; Gu, Aiqin; Chen, Xianchun; Yu, Zili

doi:10.1016/j.mtcomm.2020.101589

Cited by 10 publications

(7 citation statements)

References 58 publications

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“…These resistances included Ohmic series resistance ( R s ), SEI resistance ( R SEI ), and charge-transfer resistance ( R ct ), , and the values of the equivalent circuit resistances were calculated and are given in Table S2. It can be found that the slope of optimized PSi/SCNT-SRGO is much larger than that of PSi, exhibiting a significant decrease in the charge-transfer resistance and an increase in the lithium-diffusion coefficient. , Furthermore, the lithium-diffusion coefficient of optimized PSi/SCNT-SRGO is about 6.82 × 10 –16 cm 2 s –1 based on the plots of Z ′ vs ω –1/2 (Figure S15b) according to eqs S1 and S2, , which is increased by about 126% for PSi (3.02 × 10 –16 cm 2 s –1 ). This is attributed to the improved electrical conductivity and enhanced reversible reaction owing to the in situ formed steady weave cage-like SCNT-SRO nanostructure.…”

Section: Resultsmentioning

confidence: 95%

In Situ Formed Weave Cage-Like Nanostructure Wrapped Mesoporous Micron Silicon Anode for Enhanced Stable Lithium-Ion Battery

Fang

Liu

Zhang

et al. 2021

ACS Appl. Mater. Interfaces

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The low-cost and high-capacity micron silicon is identified as the suitable anode material for high-performance lithium-ion batteries (LIBs). However, the particle fracture and severe capacity fading during electrochemical cycling greatly impede the practical application of LIBs. Herein, we first proposed an in situ reduction and template assembly strategy to attain a weave cage-like carbon nanostructure, composed of short carbon nanotubes and small graphene flakes, as a flexible nanotemplate that closely wrapped micron-sized mesoporous silicon (PSi) to form a robust composite construction. The in situ formed weave cage-like carbon nanostructure can remarkably improve the electrochemical property and structural stability of micron-sized PSi during deep galvanostatic cycling and high electric current density owing to multiple attractive advantages. As a result, the rechargeable LIB applying this anode material exhibits improved initial Coulombic efficiency (ICE), excellent rate performance, and cyclic stability in the existing micron-sized PSi/nanocarbon system. Moreover, this anode reached an approximation of 100% ICE after only three cycles and maintains this level in subsequent cycles. This design of flexible nanotemplated platform wrapped micron-sized PSi anode provides a steerable nanoengineering strategy toward conquering the challenge of long-term reliable LIB application.

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Section: Resultsmentioning

confidence: 95%

In Situ Formed Weave Cage-Like Nanostructure Wrapped Mesoporous Micron Silicon Anode for Enhanced Stable Lithium-Ion Battery

Fang

Liu

Zhang

et al. 2021

ACS Appl. Mater. Interfaces

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“…The flat surface with no obvious cracks is attributed to the formation of a stable SEI film, which serves as a protective layer for good cycling stability. 59,60 In addition, we also carry out a TEM test on ES-Si/rGO after 200 cycles (Figure 7e−i). After 200 cycles, the sample still maintains a pomegranate-like structure, and there is no significant change before and after cycles.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…This measurement confirms that the compact pomegranate-like ES-Si/rGO could mitigate the effect of volume expansion and preserve its good electrochemical activity during the long cycling period. The flat surface with no obvious cracks is attributed to the formation of a stable SEI film, which serves as a protective layer for good cycling stability. , In addition, we also carry out a TEM test on ES-Si/rGO after 200 cycles (Figure e–i). After 200 cycles, the sample still maintains a pomegranate-like structure, and there is no significant change before and after cycles.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Capacity and Cycle Stability of a Pomegranate-Like Si/rGO Composite Anode by Electrostatic Self-Assembly and Spray-Drying Processes

Yang

et al. 2022

Ind. Eng. Chem. Res.

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Si is considered one of the most promising anodes for lithium-ion batteries due to its ultrahigh theoretical capacity and abundant resource reserves. However, the poor conductivity and large volume expansion of silicon-based anode materials seriously affect their charge−discharge efficiency and cycling stability. In this study, the dispersion of Si nanoparticles and graphene oxide (GO) is atomized into small droplets, followed by electrostatic self-assembly, spray-drying, and high-temperature annealing to obtain the pomegranate-like Si/rGO composite (ES-Si/rGO) with a concentrated size of ∼2 μm. It is noteworthy that the preparation is under mild conditions and easy to scale up. As a result, ES-Si/rGO shows a high rate performance at wide current densities and maintains a reversible capacity of 969.3 mAh g −1 after 200 cycles at 500 mA g −1 . The compact rGO improves the electrical conductivity and slows down the structure deterioration. This work is of great potential toward the scalable preparation of silicon-based anodes.

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“…This above result is consistent with the EIS data (Figure S8), indicating that PSi@CNS markedly reduced charge-transfer resistance and enhanced charge-transfer kinetics owing to the in situ generated CNS with a mesoporous structure. Furthermore, the lithium diffusion coefficient can be calculated from the plots of Z ′ versus ω –1/2 (Figure S9) based on the EIS test according to eqs S1 and S2. , Therefore, the lithium diffusion coefficient of PSi@CNS is about 3.25 × 10 –16 cm 2 /s, which is increased by nearly 10 percent compared to that of PSi (2.96 × 10 –16 cm 2 /s) and is much higher than that of PSi@SiO 2 /CNS (6.22 × 10 –17 cm 2 /s). As seen from Figure d, it is highlighted that a high reversible capacity of 1272 mA h g –1 after 500 cycles (Table ) can be obtained with a high Coulombic efficiency of 99.2% (Figure d), which is better than the most existed micron-sized PSi/C composites.…”

Section: Resultsmentioning

confidence: 99%

In Situ Generated Carbon Nanosheet-Covered Micron-Sized Porous Si Composite for Long-Cycling Life Lithium-Ion Batteries

Luo

Fang

Zhang

et al. 2020

ACS Appl. Energy Mater.

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Micron-sized silicon-based materials have attracted immense attention for large-scale lithium-ion batteries (LIBs) owing to high theoretical capacity and low cost. However, it is limited by severe volume expansion and fast capacity fading in a cycling process. Here, we proposed a facile strategy to obtain an in situ formed carbon nanosheet template-covered micron-sized porous silicon composite (PSi@CNS) from the low-cost Al−Si alloy and bicontinuous C 6 H 12 O 6 / SiO 2 structural layer. The templated assembly of the inner distributed PSi and outer in situ generated CNS can form a stable and controllable conductive structure with an increased specific surface area and enhanced intermolecular interactions. This unique composite structure results in a significant increase of electrolyte transfer and long-term stability. As an anode material for LIBs, the PSi@CNS composite exhibits a high reversible capacity of 1272 mA h g −1 at 1 A g −1 after 500 cycles in the micron-sized PSi/C composite system. This work provides a templated idea for long-term stable LIBs.

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Facile preparation of nitrogen-doped yolk-shell Si@void@C/CNTs microspheres as high-performance anode in lithium-ion batteries

Cited by 10 publications

References 58 publications

In Situ Formed Weave Cage-Like Nanostructure Wrapped Mesoporous Micron Silicon Anode for Enhanced Stable Lithium-Ion Battery

In Situ Formed Weave Cage-Like Nanostructure Wrapped Mesoporous Micron Silicon Anode for Enhanced Stable Lithium-Ion Battery

Enhanced Capacity and Cycle Stability of a Pomegranate-Like Si/rGO Composite Anode by Electrostatic Self-Assembly and Spray-Drying Processes

In Situ Generated Carbon Nanosheet-Covered Micron-Sized Porous Si Composite for Long-Cycling Life Lithium-Ion Batteries

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