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Polymers02:34

Polymers

35.7K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

2.4K
Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
2.4K
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.1K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.1K
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

2.5K
The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
2.5K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.3K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.3K

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Fabricating Reactive Surfaces with Brush-like and Crosslinked Films of Azlactone-Functionalized Block Co-Polymers
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Fabricating Reactive Surfaces with Brush-like and Crosslinked Films of Azlactone-Functionalized Block Co-Polymers

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Reactive Solid Polymer Layer: From a Single Fluoropolymer to Divergent Fluorinated Interface.

Mingyu Ma1, Xing Guo1, Peng Wen1

  • 1State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai, 200433, China.

Angewandte Chemie (International Ed. in English)
|June 19, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed novel fluoropolymer coatings for lithium metal battery anodes. These artificial solid electrolyte interphase (SEI) layers enhance battery stability and performance by creating a protective hybrid polymer-inorganic interface.

Keywords:
Li metal batterySEIcopolymerfluorinephotocatalysis

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Solid electrolyte interphase (SEI) stability is critical for rechargeable lithium metal battery (LMB) performance.
  • Controlling SEI structure and chemistry is key to advancing electrolyte-electrode interface stability.
  • Existing methods face challenges in achieving uniform and robust artificial SEI layers.

Purpose of the Study:

  • To develop an on-demand synthesis method for artificial SEI layers on lithium metal anodes.
  • To create a hybrid polymer-inorganic interphase with enhanced physical and electrochemical properties.
  • To improve the stability, coulombic efficiency, and cycling behavior of lithium metal batteries.

Main Methods:

  • Utilized photo-controlled copolymerization for the synthesis of fluorosulfonyl fluoropolymers.
  • Applied these polymers as artificial SEI layers on lithium metal anodes.
  • Employed model reactions and structural characterizations to analyze the interphase formation.

Main Results:

  • Achieved instant formation of a hybrid polymer-inorganic interphase with a polymer-enriched top and LiF-fortified bottom layer from a single component.
  • Imparted desirable properties to the SEI, including mechanical strength, flexibility, and high ion conductivity.
  • Demonstrated prolonged stabilization of lithium deposition, high coulombic efficiency, and improved cycling performance.

Conclusions:

  • Reactive polymers can be effectively used as versatile coatings to stabilize lithium metal anodes.
  • The developed fluoropolymer-based artificial SEI offers a promising solution for electrode-electrolyte interfacial challenges in LMBs.
  • This single-to-divergent strategy provides a novel avenue for designing advanced battery materials.