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Related Concept Videos

Batteries and Fuel Cells03:12

Batteries and Fuel Cells

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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Voltaic/Galvanic Cells02:47

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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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Electrolysis03:00

Electrolysis

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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Ionic Bonding and Electron Transfer02:48

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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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Ionic Bonds00:42

Ionic Bonds

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Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
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Concentration Cells02:41

Concentration Cells

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A concentration cell is a type of a  voltaic cell constructed by connecting two almost identical half-cells, both based on the same half-reaction and using the same electrode, differing only in the concentration of one redox species. A concentration cell's potential, therefore, is determined only by the concentration difference of the particular redox species.
Consider the following voltaic cell:
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In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries
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Ion-Docking Effect Enabling Rechargeable High-Voltage Magnesium-Iodine/Chlorine Battery.

Longyuan Guo1,2, Tong Li2, Ting Yang2

  • 1Institute of Advanced Energy Materials, Fujian Key Laboratory of Electrochemical Energy Storage Materials, Fuzhou University, Fuzhou, Fujian, 350116, China.

Angewandte Chemie (International Ed. in English)
|March 22, 2025
PubMed
Summary

Rechargeable magnesium batteries now offer higher energy and power density using a novel magnesium-iodine/chlorine system. This breakthrough overcomes limitations in cathode materials for advanced energy storage.

Keywords:
Halogen cathodesHigh‐VoltageMagnesium metal battery

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Rechargeable magnesium (Mg) batteries are attractive for energy storage due to low cost and resistance to dendrite formation.
  • Current limitations include a narrow selection of cathode materials, resulting in low voltage and capacity.

Purpose of the Study:

  • To develop a high-energy and high-power density magnesium battery system.
  • To activate the cathodic activity of halogens for improved battery performance.

Main Methods:

  • Exploiting the ion-docking effect between iodine cations (I+) and chlorine anions (Cl-) in a magnesium-iodine/chlorine (Mg-I/Cl) battery prototype.
  • Investigating the role of halogen species' solvation state on redox reactions.

Main Results:

  • A Mg-I/Cl battery prototype achieved a high discharge plateau of 3.0 V and capacity over 400 mAh g-1.
  • Demonstrated stable cycling for 500 cycles, ultra-fast charging at 20C, and low-temperature performance at -30 °C.

Conclusions:

  • The ion-docking effect successfully facilitates multi-electron redox reactions of halogens.
  • This Mg-I/Cl battery design offers a promising pathway for developing high-energy-density Mg battery systems.