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The conversion of allylic alcohols into epoxides using the chiral catalyst was discovered by K. Barry Sharpless and is known as Sharpless epoxidation. The use of a chiral catalyst enables the formation of one enantiomer of the product in excess. This chiral catalyst is mainly a chiral complex of titanium tetraisopropoxide and tartrate ester (specific stereoisomer). The stereoisomer used in the chiral catalyst dictates the formation of the enantiomer of the product. In other words, the use of...
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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Chronic Implantation of Multiple Flexible Polymer Electrode Arrays
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Enabling Efficient Anchoring-Conversion Interface by Fabricating Double-Layer Functionalized Separator for

Junan Feng1, Chaoyue Zhang2, Wendong Liu1

  • 1College of Physics, Qingdao University, Qingdao, 266071, P. R. China.

Angewandte Chemie (International Ed. in English)
|July 15, 2024
PubMed
Summary
This summary is machine-generated.

A novel double-layer separator functionalization enhances lithium-sulfur batteries (LiSBs) by improving lithium polysulfide (LiPSs) conversion and blocking. This strategy boosts electrochemical performance for high-energy, long-cycle LiSBs and lithium-selenium batteries (LiSeBs).

Keywords:
Adsorption-conversion mechanismDouble-layer structureInterfaceLi−S/Se batteriesShuttle effect

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Lithium-sulfur batteries (LiSBs) offer high energy density but suffer from slow kinetics, lithium polysulfide (LiPSs) shuttle, and poor separator performance.
  • Existing separators struggle to effectively contain LiPSs, hindering battery efficiency and cycle life.

Purpose of the Study:

  • To develop a novel double-layer functionalized separator for LiSBs to overcome key performance limitations.
  • To enhance the adsorption, catalytic conversion, and physical blocking of LiPSs within the battery.

Main Methods:

  • Fabrication of a double-layer separator combining a Co/CoN4@KB layer with a Ti3C2Tx MXene layer.
  • Utilizing theoretical calculations and experimental validation to assess the separator's functionality.
  • Testing the electrochemical performance of LiSBs and LiSeBs with the modified separator under various conditions.

Main Results:

  • The Co/CoN4@KB layer effectively adsorbs and catalyzes both long-chain and short-chain LiPSs, promoting conversion to Li2S.
  • The MXene layer acts as a physical barrier, trapping any escaped LiPSs and preventing polysulfide shuttling.
  • LiSBs with the functionalized separator demonstrated remarkable electrochemical performance, even with high sulfur loading and lean electrolytes.

Conclusions:

  • The double-layer functionalized separator strategy provides an effective method to create a balanced adsorption-catalytic interface for LiPSs.
  • This approach enables high-energy density and long-cycle stability in LiSBs and shows promise for LiSeBs.
  • The developed separator technology offers a universal solution for advanced battery systems requiring efficient LiPSs management.