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Related Concept Videos

Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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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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Three-dimensional covalent organic framework-based artificial interphase layer endows lithium metal anodes with high

Kaiyang Zheng1, Zhengyang Gou1, Cen Zhang1

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A novel 3D covalent organic framework (COF) acts as a robust artificial solid-state electrolyte interface (SEI) for lithium metal batteries. This advanced SEI layer enhances ion conduction and stability, enabling longer battery life.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Lithium metal batteries require robust solid-state electrolyte interfaces (SEI) to overcome challenges like lithium dendrite growth.
  • Artificial SEI layers, particularly those based on organic polymers like covalent organic frameworks (COFs), offer tunable properties for improved battery performance.

Purpose of the Study:

  • To synthesize and evaluate a 3D covalent organic framework (COF) as an artificial SEI layer for lithium metal batteries.
  • To investigate the impact of the COF's structure and functional groups on lithium ion dynamics and deposition.
  • To demonstrate the enhanced stability and performance of lithium metal batteries utilizing the 3D-COF SEI.

Main Methods:

  • Synthesis of a 3D COF with dia topology and 3D spatial geometric symmetry.
  • Application of the synthesized COF as artificial SEI layers in lithium metal battery configurations.
  • Utilized density functional theory (DFT) calculations alongside ex situ and in situ characterizations to analyze interfacial properties.

Main Results:

  • Achieved ultralow polarization voltage (46 mV) for over 9400 hours in a symmetric Li|Li cell at 10 mA cm-2.
  • Demonstrated high Li+ utilization, low polarization, and prolonged lifespan in 3D-COF-modified Li|S and Li|LFP full cells.
  • Unraveled the positive influence of interpenetrated chain segments and lithiophilic groups on Li ion dynamics and deposition.

Conclusions:

  • The 3D-COF serves as a highly reliable artificial SEI, significantly improving the stability of lithium metal batteries.
  • Multi-dimensional porous polymer SEI layers show great promise for developing highly stable and long-lasting lithium metal batteries.
  • The study provides insights into the design principles for advanced SEI materials to enable next-generation energy storage.