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Related Concept Videos

The Electrical Double Layer01:30

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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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Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution,...
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Practical Multiphase Transition Kinetics in High-Energy-Density Layered Cathodes.

Weixin Chen1, Hehe Zhang2, Duoduo Zhang1

  • 1School of Materials, Sun Yat-sen University, Shenzhen 518107, PR China.

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|March 30, 2026
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Localized degraded domains act as "phase walls" in high-energy lithium-ion battery cathodes, controlling phase transitions and battery performance. Understanding these interfacial mechanics is key to improving battery design.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Understanding phase transitions in lithium-ion batteries is vital for high-energy-density applications.
  • Microscopic reaction dynamics in electrodes, especially under nonequilibrium conditions, are not well understood.

Purpose of the Study:

  • To develop a framework for multiphase transition kinetics in highly delithiated Ni-rich cathodes.
  • To elucidate the electrochemical behavior and underlying mechanisms of phase transitions.

Main Methods:

  • Development of a multiphase transition kinetics framework.
  • Analysis of electrochemical behavior in Ni-rich cathodes.

Main Results:

  • Localized degraded domains function as "phase walls" that steer active phase evolution via interfacial mechanical interactions.
  • These phase walls dictate the balance between phase separation and solid-solution behavior during the H2-H3 transition.
  • This modulation explains charge-discharge asymmetry, sluggish kinetics, and capacity fade.

Conclusions:

  • Interfacial mechanics are critical for microstructural engineering in battery electrodes.
  • Findings offer new design principles for next-generation high-energy-density layered cathodes.