Nano-silicon embedded in MOFs-derived nitrogen-doped carbon/cobalt/carbon nanotubes hybrid composite for enhanced lithium ion storage

Luo, Hang; Wang, Qian; Wang, Yujie; Xu, Changhaoyue; Wang, Boya; Wang, Mei; Wu, Hao; Zhang, Yun

doi:10.1016/j.apsusc.2020.147134

Cited by 17 publications

(9 citation statements)

References 59 publications

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“… , Figure S4c shows the fitting results of Si 2p, and it can be seen that the Si–Si bond and Si–O bond appear at 101.4 and 10.3.2 eV, respectively. It is noteworthy that the peak area of the Si–O bond is significantly greater than that of the Si–Si bond, which may result from the surface oxidation of the original Si in air. , …”

Section: Resultsmentioning

confidence: 99%

“…It is noteworthy that the peak area of the Si−O bond is significantly greater than that of the Si−Si bond, which may result from the surface oxidation of the original Si in air. 33,34 To further analyze the doping mechanism and structural information of relevant samples, the prepared Si, V-Si-1, and V-Si-2 were refined separately (Figures 2g and S5). Taking the partial substitution of V for Si as the model, it can be found that both samples belong to the Fd3m space group and have very similar structural parameters to the standard structure (Table S1).…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

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Vanadium-Tailored Silicon Composite with Furthered Ion Diffusion Behaviors for Longevity Lithium-Ion Storage

Luo

Zhang

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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As one of the promising anode materials, silicon has attracted much attention due to its high theoretical specific capacity (∼3579 mAh g–1) and suitable lithium alloying voltage (0.1–0.4 V). Nevertheless, the enormous volume expansion (∼300%) in the process of lithium alloying has a great negative effect on its cyclic stability, which seriously restricts the large-scale industrial preparation of silicon anodes. Herein, we design a facile synthesis strategy combining vanadium doping and carbon coating to prepare a silicon-based composite (V-Si@C). The prepared V-Si@C composite does not merely show improved conductivity but also improved electrochemical kinetics, attributed to the enlarged lattice spacing by V doping. Additionally, the superiority of this doping strategy accompanied by microstructure change is embodied in the relieved volume changes during the repeated charging/discharging process. Notably, the initial capacity of the advanced V-Si@C electrode is 904 mAh g–1 (1 A g–1) and still holds at 1216 mAh g–1 even after 600 cycles, showing superior electrochemical performance. This study offers an alternative direction for the large-scale preparation of high-performance silicon-based anodes.

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Section: Resultsmentioning

confidence: 99%

Section: Synthesis and Characterizationmentioning

confidence: 99%

Vanadium-Tailored Silicon Composite with Furthered Ion Diffusion Behaviors for Longevity Lithium-Ion Storage

Luo

Zhang

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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“…To further analyze the reasons for the excellent rate performance of the YS-SiO x /C@C electrode, electrochemical impedance spectroscopy (EIS) measurements were adopted (Figure d). The equivalent circuit diagram is displayed in Figure S4, where R s and R ct represent the internal resistance and charge-transfer impedance, respectively . It is worth noting that the semicircle radius of the YS-SiO x /C@C electrode, CS-SiO x /C@C electrode, and SiO x /C electrode increases successively from the high frequency.…”

Section: Resultsmentioning

confidence: 99%

“…The equivalent circuit diagram is displayed in Figure S4, where R s and R ct represent the internal resistance and charge-transfer impedance, respectively. 49 It is worth noting that the semicircle radius of the YS-SiO x /C@C electrode, CS-SiO x /C@C electrode, and SiO x /C electrode increases successively from the high frequency. On the basis of the equivalent circuit simulation results, the R ct values of the three electrodes are 76.4, 149.9, and 228.0 Ω (Table S2), respectively, indicating that the YS-SiO x /C@C electrode has faster electrochemical reaction kinetics.…”

Section: ■ Introductionmentioning

confidence: 95%

Constructing a Yolk–Shell Structure SiO_x/C@C Composite for Long-Life Lithium-Ion Batteries

Luo

Zhang

et al. 2022

ACS Appl. Energy Mater.

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Silicon oxide is one of the most representative anode materials for lithium-ion storage. However, the poor conductivity of silicon oxide and the large volume expansion during the repeated lithium alloying/dealloying reaction have a huge impact on the cycle stability of the electrode. Here, we propose a design strategy for constructing a yolk−shell structure to enhance the electrochemical performance of the silicon oxidebased anode. Using a silane coupling agent as the raw material, organosilicon nanoparticles are prepared by hydrolysis and a selfcondensation reaction. Combining with polydiallyldimethylammonium chloride modification and polymethyl methacrylate coating, the SiO x /C@C composite with a yolk−shell structure (YS-SiO x /C@C) was obtained by one-step carbonization. The modification of polydiallyldimethylammonium chloride ensures the formation of a stable cavity during the pyrolysis process, which can effectively relieve the volume variation of the silicon oxide electrode, and the carbon shell can enhance the overall conductivity. As the anode of lithium-ion batteries, the YS-SiO x /C@C electrode showed outstanding electrochemical stability with a high specific capacity of 770 mAh g −1 and a Coulombic efficiency of 99% after 500 cycles (0.5 A g −1 ). This research provides a direction for the preparation of yolk−shell electrode materials and promotes further development of high-performance silicon oxide-based anodes.

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“…Therefore, heat management has become one of the focuses for the applications of batteries, , and extra heat has to be removed as soon as possible. Furthermore, silicon has a huge volume change during lithiation/delithiation processes to generate high stress, which causes the pulverization and fall off of active materials from current collector, , which tremendously decreases the capacity and cycle performance. The NTE material has a unique property of heat shrink, decreasing the global volume change via in situ absorbing the generated heat.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Electrochemical Performance and Safety of Silicon by a Negative Thermal Expansion Material of ZrW₂O₈

Jing

Wang

et al. 2021

ACS Appl. Mater. Interfaces

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Silicon (Si) faces big challenges in serious volume changes for applications in spite of its high theoretical capacity. Herein, a novel and facile method was proposed to decrease the volume change by simultaneously in situ absorbing the generated heat of only Si using a negative thermal expansion (NTE) material of ZrW 2 O 8 . The Si modified with 2 wt % of ZrW 2 O 8 exhibits excellent structural integrity, electrochemical performance, and safety under various conditions, especially at elevated temperatures. Its reversible capacities can remain 1187.2 mA h g −1 after 50 cycles and 643.8 mA h g −1 after 100 cycles at 2 A g −1 (∼199 and ∼190% higher than that of Si, respectively) at 25 °C. In addition, 930.6 mA h g −1 is maintained after 50 cycles at 60 °C (∼219% higher than that of Si). As current densities increase to 2 and 4 A g −1 , the values still remain 1389.4 and 757.5 mA h g −1 , respectively, much higher than that of Si. Furthermore, the strain of Si is reduced by 37.2% using ZrW 2 O 8 at 60 °C. Various products were analyzed, and the possible enhanced mechanism was discussed using multiple techniques. These findings exhibit significant potential for the improvement of energy materials using NTE materials by combining thermal effects and volume changes as well as the improved interface behavior.

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Nano-silicon embedded in MOFs-derived nitrogen-doped carbon/cobalt/carbon nanotubes hybrid composite for enhanced lithium ion storage

Cited by 17 publications

References 59 publications

Vanadium-Tailored Silicon Composite with Furthered Ion Diffusion Behaviors for Longevity Lithium-Ion Storage

Vanadium-Tailored Silicon Composite with Furthered Ion Diffusion Behaviors for Longevity Lithium-Ion Storage

Constructing a Yolk–Shell Structure SiO_x/C@C Composite for Long-Life Lithium-Ion Batteries

Enhanced Electrochemical Performance and Safety of Silicon by a Negative Thermal Expansion Material of ZrW₂O₈

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Nano-silicon embedded in MOFs-derived nitrogen-doped carbon/cobalt/carbon nanotubes hybrid composite for enhanced lithium ion storage

Cited by 17 publications

References 59 publications

Vanadium-Tailored Silicon Composite with Furthered Ion Diffusion Behaviors for Longevity Lithium-Ion Storage

Vanadium-Tailored Silicon Composite with Furthered Ion Diffusion Behaviors for Longevity Lithium-Ion Storage

Constructing a Yolk–Shell Structure SiOx/C@C Composite for Long-Life Lithium-Ion Batteries

Enhanced Electrochemical Performance and Safety of Silicon by a Negative Thermal Expansion Material of ZrW2O8

Contact Info

Product

Resources

About

Constructing a Yolk–Shell Structure SiO_x/C@C Composite for Long-Life Lithium-Ion Batteries

Enhanced Electrochemical Performance and Safety of Silicon by a Negative Thermal Expansion Material of ZrW₂O₈