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Related Concept Videos

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Sulfur Assimilation

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Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...
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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Ladder Diagrams: Redox Equilibria01:30

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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
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Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
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Amorphous Fe-Phytate Enables Fast Polysulfide Redox for High-Loading Lithium Sulfur Batteries.

Guangfeng Zeng1, Dongjiang Chen2, Cheng Zhen3

  • 1Collage of Chemistry and Food Science, Yulin Normal University, Yulin, 537000, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|June 28, 2023
PubMed
Summary

This study introduces an amorphous iron-phytate modified separator for lithium-sulfur (Li-S) batteries. It effectively suppresses polysulfide shuttling, boosting battery performance and enabling practical applications.

Keywords:
amorphous materialslithium-sulfur batteriespolar Fe-O-P bondpolysulfides conversionpolysulfides trapping

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Polysulfide shuttling is a major limitation in lithium-sulfur (Li-S) batteries.
  • Amorphous catalysts show promise for enhancing catalytic activity due to abundant active sites.
  • Understanding the structure-activity relationship of amorphous catalysts is crucial for Li-S battery development.

Purpose of the Study:

  • To propose an amorphous Fe-Phytate structure for modifying polypropylene separators (C-Fe-Phytate@PP).
  • To enhance polysulfide conversion and suppress polysulfide shuttling in Li-S batteries.
  • To investigate the catalytic activity and adsorption properties of the amorphous Fe-Phytate structure.

Main Methods:

  • Synthesis and characterization of amorphous Fe-Phytate.
  • Modification of polypropylene separators with C-Fe-Phytate@PP.
  • Electrochemical testing of Li-S batteries utilizing the modified separators.

Main Results:

  • The C-Fe-Phytate@PP separator demonstrated accelerated polysulfide conversion via Fe-S bonding.
  • Enhanced redox kinetics and robust polysulfide adsorption were observed compared to bare carbon.
  • Li-S batteries with C-Fe-Phytate@PP achieved a high rate capability (690 mAh g⁻¹ at 5 C) and areal capacity (7.8 mAh cm⁻² at 7.3 mg cm⁻² sulfur loading).

Conclusions:

  • Amorphous Fe-Phytate is an effective catalyst for polysulfide conversion in Li-S batteries.
  • The modified separator significantly suppresses the shuttling effect, improving battery performance.
  • This work offers a novel separator strategy for advancing the practical application of Li-S batteries.