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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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Metal-Semiconductor Junctions01:24

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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Induction/Inhibition Effect on Lithium Dendrite Growth by a Binary Modification Layer on a Separator.

Yitian Ma1, Wenjie Qu2, Xin Hu3

  • 1School of Materials Science and Engineering, Xi'an University of Science and Technology, Xi'an 710054, China.

ACS Applied Materials & Interfaces
|September 23, 2022
PubMed
Summary
This summary is machine-generated.

Modified separators with an InN thin layer prevent lithium dendrite growth in lithium metal batteries (LMBs). This enhances battery performance and safety by forming Li-In alloy and Li3N protective layers.

Keywords:
in situ conversioninterface modificationlithium dendritelithium metal anodeseparator

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Lithium metal batteries (LMBs) face challenges from lithium dendrite growth, which can cause internal short circuits and battery failure.
  • Separator integrity is crucial for preventing dendrite penetration and ensuring safe operation of LMBs.

Purpose of the Study:

  • To design and evaluate a modified separator for lithium metal batteries that inhibits lithium dendrite growth.
  • To investigate the in situ conversion of an InN thin layer into a protective composite layer during battery cycling.

Main Methods:

  • Fabrication of a separator modified with an indium nitride (InN) thin layer.
  • Electrochemical testing of the modified separator in lithium metal cells to assess lithium plating/stripping behavior.
  • Analysis of the separator's surface and composition after cycling to identify the formed protective layers.

Main Results:

  • The InN thin layer in situ converted into a dual-phase layer composed of lithium-indium (Li-In) alloy and lithium nitride (Li3N).
  • Li-In alloy promoted lateral lithium growth, preventing dendrite penetration, while Li3N improved ion distribution at the anode/separator interface.
  • The synergistic effect of the Li-In alloy and Li3N significantly improved the electrochemical performance and cycling stability of LMBs.

Conclusions:

  • The InN-modified separator effectively suppresses lithium dendrite growth and enhances the safety and performance of lithium metal batteries.
  • The facile and scalable nature of the separator modification process, suitable for roll-to-roll manufacturing, makes it promising for practical applications.