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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Localized Ligands Assist Ultrafast Multivalent-Cation Intercalation Pseudocapacitance.

Luting Xie1, Kui Xu2, Wenlu Sun1

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Angewandte Chemie (International Ed. in English)
|April 23, 2023
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Summary
This summary is machine-generated.

Researchers developed a novel organic cathode for rechargeable batteries using multivalent cations. This new material offers fast charging and long cycle life for calcium and zinc storage, presenting a low-cost alternative to lithium-ion batteries.

Keywords:
CathodesIntercalation PseudocapacitanceMultivalent Ion BatteriesOrganic FrameworksStability

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Multivalent cation (Mvn+) batteries are promising low-cost alternatives to lithium-ion batteries.
  • High charge density of Mvn+ typically causes slow kinetics and poor structural stability in cathodes.

Purpose of the Study:

  • To investigate Mvn+ storage mechanisms in organic frameworks.
  • To develop high-performance organic cathodes for rechargeable batteries.

Main Methods:

  • Utilized a 2D bivalve-like organic framework with localized ligands.
  • Investigated intercalation pseudocapacitance mechanism for Mvn+ storage.
  • Analyzed structural stability and electrochemical kinetics.

Main Results:

  • Achieved ultrafast kinetics and minimal structural change via localized ligand-assisted-intercalation pseudocapacitance.
  • Demonstrated excellent power density (57 kW/kg over 20,000 cycles) for Ca2+ storage.
  • Showcased high power density (14 kW/kg over 45,000 cycles) and long cycle life for Zn2+ storage.

Conclusions:

  • Localized ligand-assisted-intercalation pseudocapacitance enables efficient Mvn+ storage.
  • Organic frameworks offer a viable route for developing advanced multivalent-ion batteries.
  • This approach provides a new strategy for ultrafast Mvn+ storage through dynamic coordination microstructures.