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Electrodeposition01:08

Electrodeposition

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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.
Electrodeposition can...
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Formation of Complex Ions03:45

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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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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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What is an Electrochemical Gradient?01:26

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Adenosine triphosphate, or ATP, is considered the primary energy source in cells. However, energy can also be stored in the electrochemical gradient of an ion across the plasma membrane, which is determined by two factors: its chemical and electrical gradients.
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Voltaic/Galvanic Cells

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Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
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Non-aqueous Electrode Processing and Construction of Lithium-ion Coin Cells
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Constructing Ionic Gradient and Lithiophilic Interphase for High-Rate Li-Metal Anode.

Yimei Lai1, Yun Zhao2, Weiping Cai1

  • 1School of Textile Materials and Engineering, Wuyi University, Jiangmen, 529020, China.

Small (Weinheim an Der Bergstrasse, Germany)
|October 17, 2019
PubMed
Summary

A novel protective film enables stable, high-rate lithium metal anodes by controlling ion flow and reducing dendrite formation. This breakthrough promises more durable and efficient lithium-metal batteries.

Keywords:
Li-metal anode protectionionic gradient and lithiophilic interphasessoft LLTO nanofiberssoft lithiophilic Al2O3 nanofibers

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Lithium metal anodes offer high theoretical capacity but are limited by dendrite growth, especially at high charge/discharge rates.
  • Dendrite formation leads to short circuits and reduced battery lifespan, hindering the development of high-performance lithium metal batteries.

Purpose of the Study:

  • To develop a durable and high-rate lithium metal anode.
  • To mitigate lithium dendrite growth through a specialized inter-phase film.
  • To enhance the stability and cycling performance of lithium metal batteries.

Main Methods:

  • Fabrication of a composite inter-phase film using sol-gel electrospinning and sintering.
  • The film comprises an ionic-conductive lithium lanthanum titanium oxide (LLTO) nanofiber layer and a lithiophilic aluminum oxide (Al2O3) nanofiber layer.
  • Electrochemical testing of the developed anode in full cells.

Main Results:

  • The inter-phase film establishes a homogeneous ionic field distribution and reduces the nucleation barrier for lithium deposition.
  • Achieved dendrite-free lithium plating and stripping for over 1000 hours at a high current density of 5 mA cm⁻².
  • Full cells demonstrated a high capacity of 133.3 mA h g⁻¹ at 5 C over 150 cycles.

Conclusions:

  • The developed ionic gradient and lithiophilic inter-phase film effectively suppresses lithium dendrite growth.
  • This strategy enables stable and high-rate cycling of lithium metal anodes, paving the way for advanced energy storage solutions.
  • The findings represent a significant advancement for the practical application of high-rate lithium metal anodes.