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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.
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A High-Performance Lithium-Ion Capacitor Based on 2D Nanosheet Materials.

Shaohui Li1, Jingwei Chen1, Mengqi Cui1

  • 1School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore.

Small (Weinheim an Der Bergstrasse, Germany)
|November 29, 2016
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Summary

This study presents a novel lithium-ion capacitor (LIC) using a ZnMn2O4-graphene anode and N-doped carbon cathode. The new design enhances energy density at high power, overcoming limitations of traditional LICs.

Keywords:
2D materialsenergy storagelithium-ion capacitornanosheets

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Lithium-ion capacitors (LICs) offer high energy and power but suffer from energy density degradation at high power.
  • This degradation is often due to slow reaction kinetics at the battery-type anode.

Purpose of the Study:

  • To develop a high-performance LIC that maintains high energy density even at high power.
  • To address the kinetic limitations in traditional LIC anodes.

Main Methods:

  • Fabrication of a novel anode using well-defined ZnMn2O4-graphene hybrid nanosheets.
  • Utilization of N-doped carbon nanosheets as the cathode material.
  • Characterization of the electrochemical performance of the fabricated LIC.

Main Results:

  • The 2D nanomaterials facilitate rapid ion transport and storage due to high surface area and short diffusion paths.
  • The fabricated LIC achieves a specific energy of 202.8 Wh kg−1 at 180 W kg−1.
  • A specific energy of 98 Wh kg−1 is maintained at a high specific power of 21 kW kg−1.

Conclusions:

  • The developed ZnMn2O4-graphene anode and N-doped carbon cathode significantly improve LIC performance.
  • This hybrid nanomaterial approach effectively overcomes the energy density degradation issue at high power densities.
  • The study demonstrates a promising strategy for advanced energy storage devices.