Dendrite-structured FeF2 consisting of closely linked nanoparticles as cathode for high-performance lithium-ion capacitors

Liang, Huanyu; Hu, Zhengqiang; Zhao, Zhongchen; Dong, Chen; Zhang, Hao; Wang, Huaizhi; Wang, Xia; Li, Qiang; Guo, Xiangxin; Li, Hongsen

doi:10.1016/j.jechem.2020.07.031

Cited by 33 publications

(16 citation statements)

References 57 publications

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“…For further comparison, Figures 3D-F illustrate the charge/discharge curves of hierarchical WO 3 agglomerates, WO 3 bricks, and WO 3 micro-spheres under a stationary current density of 100 mA g −1 within the voltage range of 0.01-3.0 V (vs. Li/Li + ). Note that, from all the three electrodes, the difference in discharge-specific capacity is quite obvious between the first two cycles, but achieves stability in the subsequent cycles, which can be possibly explained by the stable surface state and electrochemical reversibility after the initial activation process (Liang et al, 2021a;Wang et al, 2021). However, the hierarchical WO 3 agglomerate electrode exhibits a higher discharge capacity of 487.6 mAh g −1 after the first cycle, much better than WO 3 bricks (377.7 mAh g −1 ) and WO 3 micro-spheres (393.6 mAh g −1 ).…”

Section: Resultsmentioning

confidence: 93%

Architecting Hierarchical WO3 Agglomerates Assembled With Straight and Parallel Aligned Nanoribbons Enabling High Capacity and Robust Stability of Lithium Storage

et al. 2022

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The pursuit of electrochemical energy storage has led to a pressing need on materials with high capacities and energy densities; however, further progress is plagued by the restrictive capacity (372 mAh g−1) of conventional graphite materials. Tungsten trioxide (WO3)-based anodes feature high theoretical capacity (693 mAh g−1), suitable potential, and affordable cost, arousing ever-increasing attention and intense efforts. Nonetheless, developing high-performance WO3 electrodes that accommodate lithium ions remains a daunting challenge on account of sluggish kinetics characteristics and large volume strain. Herein, the well-designed hierarchical WO3 agglomerates assembled with straight and parallel aligned nanoribbons are fabricated and evaluated as an anode of lithium-ion batteries (LIBs), which exhibits an ultra-high capacity and excellent rate capability. At a current density of 1,000 mA g−1, a reversible capacity as high as 522.7 mAh g−1 can be maintained after 800 cycles, corresponding to a high capacity retention of ∼80%, demonstrating an exceptional long-durability cyclic performance. Furthermore, the mechanistic studies on the lithium storage processes of WO3 are probed, providing a foundation for further optimizations and rational designs. These results indicate that the well-designed hierarchical WO3 agglomerates display great potential for applications in the field of high-performance LIBs.

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Section: Resultsmentioning

confidence: 93%

Architecting Hierarchical WO3 Agglomerates Assembled With Straight and Parallel Aligned Nanoribbons Enabling High Capacity and Robust Stability of Lithium Storage

et al. 2022

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“…The electrode material exhibits battery characteristics and pseudocapacitance characteristics when the b value is between 0.5 and 1, so CoF 2 is dominated by diffusion control. Nevertheless, the contribution of pseudocapacitance is also important in the whole dynamic process and calculation by the following formula: [42]

true normali = k_{1} normalv + k_{2} {normalv}^{\frac{1}{2}}

…”

Section: Resultsmentioning

confidence: 99%

Constructing High‐Performance Li‐ion Capacitors via Cobalt Fluoride with Excellent Cyclic Stability as Anode and Coconut Shell Biomass‐Derived Carbon as Cathode Materials

Jiao

Gao

et al. 2021

ChemistrySelect

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The Lithium‐ion capacitor (LIC) is a potential candidate for the next generation of energy storage devices due to high power density, high energy density and excellent cycle stability. Nonetheless, the problem of matching optimization is still faced for LIC. Many different approaches are explored to find a balance between the two storage mechanisms so that high performance LICs can be obtained. Here, CoF2, prepared by solvothermal method, showed reversible specific capacity of 307 mAh g−1 after 900 cycles at 0.1 A g−1 and 81 mAh g−1 after 10,000 cycles at 4 A g−1. Meanwhile, coconut shell is used as precursor for preparing natural porous carbon as cathode materials of LIC. The coconut shell biomass carbon (CSBC‐5), outstanding specific surface area (2767 m2 g−1), holds a capacity of 120 mAh g−1 after 1000 cycles at 1 A g−1. The LIC, CoF2 as anode and CSBC‐5 as cathode, shows excellent cycle stability (65 % capacity retention after 5000 cycles), higher energy density of 82 Wh kg−1 (at power density of 190 W kg−1) and higher power density of 3800 W kg−1(at energy density of 50 Wh kg−1). Therefore, the material of CoF2 is a promising choice for the future anode and promotes the development of LIC.

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“…As one of the thinnest insulators, fluorographene is most commonly used in the battery field. Fluorographene also plays an important role in industrial lubrication due to its delamination nature, low surface energy, and easy peeling characteristics (Chronopoulos et al 2017 ; Liang et al 2021 ). As such, fluorinated compounds are gradually becoming important sources of novel functional materials.…”

Section: Applications Of Fluorinated Compoundsmentioning

confidence: 99%

Enzymatic synthesis of fluorinated compounds

Cheng

2021

Appl Microbiol Biotechnol

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Fluorinated compounds are widely used in the fields of molecular imaging, pharmaceuticals, and materials. Fluorinated natural products in nature are rare, and the introduction of fluorine atoms into organic compound molecules can give these compounds new functions and make them have better performance. Therefore, the synthesis of fluorides has attracted more and more attention from biologists and chemists. Even so, achieving selective fluorination is still a huge challenge under mild conditions. In this review, the research progress of enzymatic synthesis of fluorinated compounds is summarized since 2015, including cytochrome P450 enzymes, aldolases, fluoroacetyl coenzyme A thioesterases, lipases, transaminases, reductive aminases, purine nucleoside phosphorylases, polyketide synthases, fluoroacetate dehalogenases, tyrosine phenol-lyases, glycosidases, fluorinases, and multienzyme system. Of all enzyme-catalyzed synthesis methods, the direct formation of the C-F bond by fluorinase is the most effective and promising method. The structure and catalytic mechanism of fluorinase are introduced to understand fluorobiochemistry. Furthermore, the distribution, applications, and future development trends of fluorinated compounds are also outlined. Hopefully, this review will help researchers to understand the significance of enzymatic methods for the synthesis of fluorinated compounds and find or create excellent fluoride synthase in future research. Key points • Fluorinated compounds are distributed in plants and microorganisms, and are used in imaging, medicine, materials science . • Enzyme catalysis is essential for the synthesis of fluorinated compounds . • The loop structure of fluorinase is the key to forming the C-F bond . Supplementary Information The online version contains supplementary material available at 10.1007/s00253-021-11608-0.

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Dendrite-structured FeF2 consisting of closely linked nanoparticles as cathode for high-performance lithium-ion capacitors

Cited by 33 publications

References 57 publications

Architecting Hierarchical WO3 Agglomerates Assembled With Straight and Parallel Aligned Nanoribbons Enabling High Capacity and Robust Stability of Lithium Storage

Architecting Hierarchical WO3 Agglomerates Assembled With Straight and Parallel Aligned Nanoribbons Enabling High Capacity and Robust Stability of Lithium Storage

Constructing High‐Performance Li‐ion Capacitors via Cobalt Fluoride with Excellent Cyclic Stability as Anode and Coconut Shell Biomass‐Derived Carbon as Cathode Materials

Enzymatic synthesis of fluorinated compounds

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