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Related Concept Videos

Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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Preparation of Graphene Liquid Cells for the Observation of Lithium-ion Battery Material
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Bifunctional poly(1,3-dioxolane)-graphitic C3N4 composite interlayers enable stable and compatible anode interfaces

Wenqiang Tao1, Ru Li2, Zhijie Bi1

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

Journal of Colloid and Interface Science
|January 25, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a novel poly(1,3-dioxolane)-graphitic carbon nitride (PDOL-CN) composite interlayer to enhance the stability of polyacrylonitrile (PAN)-based solid electrolytes in lithium metal batteries. The PDOL-CN interlayer improves interfacial contact and suppresses side reactions, enabling stable battery cycling.

Keywords:
Graphitic C(3)N(4)Interfacial issuesPAN-based electrolytesSolid lithium batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Polyacrylonitrile (PAN)-based composite solid electrolytes (CSEs) are promising for solid lithium batteries (SLBs) due to high voltage stability.
  • However, PAN-based CSEs exhibit poor stability against lithium metal anodes, hindering practical application.

Purpose of the Study:

  • To develop a stable and conductive composite interlayer for the anode interface of PAN-based CSEs.
  • To improve the compatibility and electrochemical stability between the electrolyte and Li-metal anode.

Main Methods:

  • In-situ introduction of a poly(1,3-dioxolane) (PDOL)-graphitic carbon nitride (g-C3N4, CN) composite interlayer at the anode interface.
  • Characterization of the interlayer's ionic conductivity, electrochemical stability, and effect on lithium deposition.
  • Testing of Li symmetric cells and LiNi0.6Co0.2Mn0.2O2 (NCM622)||Li full cells.

Main Results:

  • The PDOL-CN interlayer exhibited high ionic conductivity (2.96 × 10⁻⁴ S cm⁻¹) and ionic transference number (0.69).
  • It effectively suppressed side reactions between PAN and Li-metal, enabling stable cycling of Li symmetric cells for 400 hours.
  • The interlayer promoted the formation of a Li3N-enriched solid electrolyte interface (SEI) with fast Li+ transfer, ensuring uniform Li deposition.

Conclusions:

  • The PDOL-CN composite interlayer significantly enhances the interfacial compatibility and chemical stability in PAN-based CSEs for SLBs.
  • The developed interlayer contributes to stable cycling of NCM622||Li full cells, achieving 88.2% capacity retention after 270 cycles.