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Related Concept Videos

The Electrical Double Layer01:30

The Electrical Double Layer

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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...
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Anion-tethered interface engineering enabling dendrite-free lithium metal anodes.

Lanlan Zuo1, Xu Fan1, Hang Yu1

  • 1Department of Materials Science and Engineering, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, Hunan 410000, China. chenyufang@nudt.edu.cn.

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Summary
This summary is machine-generated.

Engineered fiber separators with anion-sieving properties enable uniform lithium deposition and enhance battery performance. This innovation leads to dendrite-free lithium metal batteries with improved capacity retention.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Lithium metal batteries (LMBs) offer high energy density but suffer from dendrite formation and low cycle stability.
  • Current separators often lack the functionality to control ion transport and lithium deposition.
  • Metal-organic frameworks (MOFs) show promise but face challenges with agglomeration and reactivity.

Purpose of the Study:

  • To develop a functionalized fiber separator for enhanced lithium deposition and improved LMB performance.
  • To address MOF agglomeration and reactivity issues through in situ integration with polyacrylonitrile (PAN) fibers.
  • To achieve dendrite-free lithium metal battery operation via advanced separator engineering.

Main Methods:

  • In situ integration of MOFs with PAN fibers to create a composite separator.
  • Utilizing anion-sieving effects to guide Li+ transfer and deposition.
  • Employing real-time visualization technology to observe lithium deposition behavior.
  • Fabricating and testing Li‖Li symmetric cells and Li‖LiNi0.8Co0.1Mn0.1O2 cells.

Main Results:

  • The functionalized separator demonstrated rapid Li+ transfer and guided uniform Li deposition.
  • In situ MOF integration prevented agglomeration and reduced reactivity with Li anodes.
  • Li‖Li symmetric cells showed excellent plating-stripping reversibility at 10 mA cm-2.
  • Li‖LiNi0.8Co0.1Mn0.1O2 cells achieved 17% higher capacity retention over 250 cycles compared to commercial separators.

Conclusions:

  • The in situ chemically modified fiber separator effectively enables dendrite-free lithium metal batteries.
  • Separator engineering with MOF/PAN composites is a viable strategy for high-performance LMBs.
  • The developed separator enhances ion transport, promotes uniform lithium deposition, and improves cycle life.