Hollow multi-nanochannel carbon nanofibers@MoSe2 nanosheets composite as flexible anodes for high performance lithium-ion batteries

Ni, Xuepeng; Cui, Zhe; Luo, Hui; Chen, Huifang; Liu, Cheng‐Lin; Wu, Qilin; Ju, Anqi

doi:10.1016/j.cej.2020.126249

Cited by 63 publications

(31 citation statements)

References 37 publications

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“…Figure 1c and d display the high resolution XPS spectra of Mo 3d and Se 3d in the UTRDE‐MoSe 2 sample. In Figure 1c, the Mo 3d peaks could be split into two peaks at 229 and 232.1 eV, corresponding to the Mo 3d 5/2 and Mo 3d 3/2 peaks of the Mo element, further proving the existence of Mo 4+ [26,27] . In Figure 1d, the two well‐defined peaks at 54.6 and 55.4 eV in Se 3d spectra are belong to the Se 3d 5/2 and Se 3d 3/2 , respectively [26] .…”

Section: Resultsmentioning

confidence: 79%

“…In Figure 1c, the Mo 3d peaks could be split into two peaks at 229 and 232.1 eV, corresponding to the Mo 3d 5/2 and Mo 3d 3/2 peaks of the Mo element, further proving the existence of Mo 4+ [26,27] . In Figure 1d, the two well‐defined peaks at 54.6 and 55.4 eV in Se 3d spectra are belong to the Se 3d 5/2 and Se 3d 3/2 , respectively [26] . It demonstrates that Se element exists in the UTRDE‐MoSe 2 sample in the form of negative bivalence.…”

Section: Resultsmentioning

confidence: 79%

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Enhancing Mg²⁺ and Mg²⁺/Li⁺ Storage by Introducing Active Defect Sites and Edge Surfaces in MoSe₂

et al. 2021

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Recently, Mg‐ion batteries (MIBs) and Mg−Li hybrid ion batteries (MLIBs) are deemed as potential energy‐storage devices. However, due to the insufficient storage sites of Mg2 + in the cathode, MIBs show a low reversible capacity. For MLIBs, the property is also seriously restricted due to the main Li+ intercalation reaction and less Mg2+ intercalation reaction. Herein, ultrathin MoSe2 nanosheets with enriched atomic defects and exposed edge surfaces are prepared by the hydrothermal method and subsequent hydrogen treatment. It is found that the Mg2+ storage performance is markedly enhanced, and Mg2+/Li+ co‐intercalation can be achieved. Density functional theory (DFT) calculation shows that, by introducing a large number of atomic defects and edge exposed surfaces in the ultrathin MoSe2 nanosheets, the Mg2+ storage sites are increased, and the diffusion and migration ability of Mg2+ and Li+ are improved, resulting in a significant property improvement. Further, the Mg2+ intercalation in MIBs and Mg2+/Li+ co‐intercalation in MLIBs are confirmed. The discharge‐charge mechanisms only based on the intercalation reactions for both MIBs and MLIBs are also revealed.

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Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 79%

Enhancing Mg²⁺ and Mg²⁺/Li⁺ Storage by Introducing Active Defect Sites and Edge Surfaces in MoSe₂

et al. 2021

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“…It was surprisingly found that the discharge capacity in 0∼1.5 V at the second cycle was 244.5, and 209.0 mAh g –1 was retained after 1000 cycles (corresponding to 85.5% retention), suggesting that the GeP@NC-2 was very stable during long-term lithiation/delithiation and was very conductive to manufacture of high-voltage full cells. In addition, the discharge capacity of GeP@NC-2 was compared with that for the previously reported similar techniques used to improve rate and cycling performance. ,,,− It should be noted that except for Ref ., where the discharge/discharge voltage range was 0–1 V versus Li + /Li, the discharge/charge voltage range of other references was 0–3 V versus Li + /Li. Obviously, the GeP@NC-2 prepared in this study displayed higher capacity than that of Ref .…”

Section: Results and Discussionmentioning

confidence: 99%

Confining Nano-GeP in Nitrogenous Hollow Carbon Fibers toward Flexible and High-Performance Lithium-Ion Batteries

Zeng

Feng

Liu

et al. 2021

ACS Appl. Mater. Interfaces

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Although graphite has been used as anodes of lithium-ion batteries (LiBs) for 30 years, its unsatisfactory energy density makes it insufficient toward some new electronic products such as unmanned aerial vehicles. Herein, in situ synthesis of nano-GeP confined in nitrogen-doped carbon (GeP@NC) fibers was designed and performed via coaxial electrospinning followed by a phosphating process. This way ensured the paper-like GeP@NC-x electrode with high conductivity, high flexibility, and lightweight properties, which simultaneously solved the key scientific problems of difficulty in structural design and severe volume expansion of GeP. The inner diameter and wall thickness of the nanofibers can be effectively controlled by adjusting the size of electrospinning needles. It was suggested that the fibers not only effectively inhibited the growth of GeP, resulting in the synthesis of nano-GeP with size less than 50 nm, but also alleviated the volume expansion/agglomeration and improved the diffusion kinetics of Li+ in nano-GeP during cycling. The Li+ diffusion coefficient can be improved by reducing the inner diameter and wall thickness of the fibers. As a model system, the paper-like electrode (GeP@NC-2) with a fiber diameter of 280 nm and a wall thickness of 110 nm exhibited the best electrochemical performance. When applied as anodes in LiBs, it displayed a reversible capacity of 612 mAh g–1 at the 600th cycle at 1 A g–1, while GeP@NC-0 with a solid structure only delivered 239 mAh g–1. Furthermore, the GeP@NC-2 also exhibited good long-term cycling stability at 5 A g–1, and the capacity displayed a slight difference of 221.2 and 209.0 mAh g–1 in a voltage range of 0∼3 V and 0∼1.5 V, respectively. The well-defined synthetic approach combined with unique nanostructural design provided a meaningful reference for the rational design and development of next-generation flexible and high-performance LiB anodes.

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“…44 How to figure out these limitations by learning from nature would be a future direction. On the other hand, the artificial reaction systems with CCE have their own features compared to the biological reaction system, multistep reactions can be designed in nanochannels, 85 multifunction catalysts can be inserted into the nanochannels, 86 and designable structure and controllable surface properties of nanochannels can be fabricated based on the research purpose. Besides, these reactions in artificial nanochannels could endure extreme conditions, such as high temperature and pressure.…”

Section: Nanoscale Advances Accepted Manuscriptmentioning

confidence: 99%

Catalytic confinement effects in nanochannels: from biological synthesis to chemical engineering

et al. 2022

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Hollow multi-nanochannel carbon nanofibers@MoSe2 nanosheets composite as flexible anodes for high performance lithium-ion batteries

Cited by 63 publications

References 37 publications

Enhancing Mg²⁺ and Mg²⁺/Li⁺ Storage by Introducing Active Defect Sites and Edge Surfaces in MoSe₂

Enhancing Mg²⁺ and Mg²⁺/Li⁺ Storage by Introducing Active Defect Sites and Edge Surfaces in MoSe₂

Confining Nano-GeP in Nitrogenous Hollow Carbon Fibers toward Flexible and High-Performance Lithium-Ion Batteries

Catalytic confinement effects in nanochannels: from biological synthesis to chemical engineering

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Hollow multi-nanochannel carbon nanofibers@MoSe2 nanosheets composite as flexible anodes for high performance lithium-ion batteries

Cited by 63 publications

References 37 publications

Enhancing Mg2+ and Mg2+/Li+ Storage by Introducing Active Defect Sites and Edge Surfaces in MoSe2

Enhancing Mg2+ and Mg2+/Li+ Storage by Introducing Active Defect Sites and Edge Surfaces in MoSe2

Confining Nano-GeP in Nitrogenous Hollow Carbon Fibers toward Flexible and High-Performance Lithium-Ion Batteries

Catalytic confinement effects in nanochannels: from biological synthesis to chemical engineering

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Enhancing Mg²⁺ and Mg²⁺/Li⁺ Storage by Introducing Active Defect Sites and Edge Surfaces in MoSe₂

Enhancing Mg²⁺ and Mg²⁺/Li⁺ Storage by Introducing Active Defect Sites and Edge Surfaces in MoSe₂