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Related Concept Videos

MOS Capacitor01:25

MOS Capacitor

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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.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
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Capacitors and Capacitance01:18

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A device consisting of two electrical conductors that are separated by a distance and used to store electrical charges is called a capacitor. The space between the conductors is either a vacuum or an insulating material, called a dielectric. Capacitors have many applications, ranging from filtering static from radio reception to energy storage in heart defibrillators.
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Dielectric Polarization in a Capacitor

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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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Interfacial Electrochemical Methods: Overview01:06

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Energy Stored in Capacitors01:10

Energy Stored in Capacitors

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A parallel plate capacitor, when connected to a battery, develops a potential difference across its plates. This potential difference is key to the operation of the capacitor, as it determines how much electrical energy the capacitor can store.
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P-N junction01:11

P-N junction

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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Updated: Jul 6, 2025

Construction and Testing of Coin Cells of Lithium Ion Batteries
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Processing mechanism synergizing surface and intercalation pseudocapacitance engineering fast-charging Li-based anode

Zhuo Chen1, Qiming Wang2, Shuai Bai1

  • 1Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, Fujian, 350002, P. R. China; University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.

Journal of Colloid and Interface Science
|January 6, 2024
PubMed
Summary
This summary is machine-generated.

A novel vanadium-based conductive network hydrate, (Na0.13Mg0.02)V2O5·0.98H2O (NMVO), was developed for pseudocapacitive energy storage. This material exhibits exceptional stability and rapid charge/discharge capabilities, paving the way for advanced battery technologies.

Keywords:
Fast-charging storage materialIntercalation pseudocapacitanceSurface pseudocapacitance

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Pseudocapacitive materials offer rapid charge and discharge kinetics essential for high-performance energy storage devices.
  • Developing stable and efficient electrode materials with enhanced conductivity and ion diffusion is crucial for advancing battery technology.

Purpose of the Study:

  • To design and synthesize a novel vanadium-based conductive network hydrate, (Na0.13Mg0.02)V2O5·0.98H2O (NMVO), for pseudocapacitive applications.
  • To investigate the structural and electrochemical properties of NMVO and its reduced form (r-NMVO) for enhanced energy storage performance.

Main Methods:

  • Synthesis of a vanadium-based conductive network hydrate (NMVO) with a specific layered structure.
  • In-situ electrochemical processing to create hierarchical heterostructures (r-NMVO) with enhanced active sites.
  • Utilized first-principles calculations, in-situ, and ex-situ characterization techniques to elucidate the charge storage mechanism.

Main Results:

  • The designed NMVO exhibits a conductive network with a large layer spacing (11.67 Å), facilitating rapid cation diffusion and conductivity.
  • The reduced r-NMVO demonstrates hierarchical heterostructures with multiple vanadium-based active sites, promoting surface redox pseudocapacitance.
  • The r-NMVO electrode achieved remarkable cycle stability, retaining 95.5% capacity after 65,500 cycles at 50 A g-1 in a Li battery.

Conclusions:

  • The developed r-NMVO material exhibits a robust intercalation-surface redox pseudocapacitive mechanism, leading to superior electrochemical performance.
  • The material's strong pulse impact resistance and enhanced cycle stability are attributed to its integrated heterostructure and conductive network.
  • This study provides a pathway for designing stable, fast-charging pseudocapacitive materials for next-generation energy storage solutions.