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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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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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Zinc-Sponge Battery Electrodes that Suppress Dendrites
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Facile Formation of a Solid Electrolyte Interface as a Smart Blocking Layer for High-Stability Sulfur Cathode.

Junling Guo1, Xinyu Du1, Xiaolong Zhang1

  • 1State Key Laboratory of Fine Chemicals and School of Petroleum and Chemical Engineering, Dalian University of Technology, 2 Dagong Road, Liaodongwan New District, Panjin, 124221, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|April 25, 2017
PubMed
Summary

Researchers developed a novel strategy for lithium-sulfur batteries (LSBs) using porous carbon spheres and a smart solid electrolyte interface (SEI) to prevent polysulfide shuttle reactions, significantly improving cycle life.

Keywords:
Li-sulfur batterieslithium polysulfide blockingsolid electrolyte interfaces

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Lithium-sulfur batteries (LSBs) face challenges in practical application due to poor cycle life.
  • Polysulfide shuttle reactions of dissolved species are a primary cause of performance degradation in LSBs.

Purpose of the Study:

  • To develop a high-performance cathode for LSBs by suppressing polysulfide accumulation and migration.
  • To enhance the stability and cycle life of LSBs through a novel encapsulation strategy.

Main Methods:

  • Encapsulation of sulfur and electrolyte within porous carbon spheres.
  • Formation of a selective solid electrolyte interface (SEI) that sieves Li+ ions while blocking polysulfides.
  • Cycling the carbon/sulfur cathode within a specific voltage window (0.3-1.0 V) to form the smart SEI.

Main Results:

  • The novel SEI effectively prevented polysulfide accumulation and migration.
  • The carbon/sulfur cathode demonstrated superior stability, achieving over 600 cycles.
  • The strategy is simple, effective, and compatible with other advanced cathode designs.

Conclusions:

  • The developed SEI strategy offers a straightforward and effective solution to polysulfide shuttle reactions in LSBs.
  • This approach significantly enhances the cycle life and stability of lithium-sulfur batteries.
  • The method holds promise for improving the overall performance of LSBs and their practical viability.