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Extraction: Advanced Methods

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...

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Related Experiment Video

Updated: May 14, 2026

Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures

Growth and Electrostatic/chemical Properties of Metal/LaAlO₃/SrTiO₃ Heterostructures

Published on: February 8, 2018

Regulating Li Extraction in Transition Metal Layer for High-Performance Li-Excess Layered Oxide Cathode with

Yawen Yan¹, Guifan Zeng¹, Chenglin Pua²

¹State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, China.

Advanced Materials (Deerfield Beach, Fla.)

|May 13, 2026

Summary

This summary is machine-generated.

Researchers developed a new cathode material for lithium-ion batteries. This material uses oxygen-stacking engineering to prevent structural damage, improving battery performance and lifespan.

Keywords:

Li‐excess layered oxides anionic redox intergrowth phase ion exchange local structural reversibility

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Published on: September 12, 2018

Area of Science:

Materials Science
Electrochemistry
Solid-State Chemistry

Background:

Lithium-excess layered oxide cathodes offer high capacity via anionic redox.
However, lithium extraction can cause irreversible structural changes.
Conventional edge-shared configurations facilitate detrimental lithium migration.

Purpose of the Study:

To investigate a face-shared configuration to limit interlayer lithium migration.
To develop a strategy for enhanced structural reversibility in lithium-excess cathodes.

Main Methods:

Synthesized Li-excess cathode via Na-to-Li ion exchange in a P2 phase precursor.
Utilized oxygen-stacking engineering to create an O2/O6 intergrowth structure.
Characterized structural stability and lithium ion mobility during charging.

Main Results:

Successfully obtained the face-shared configuration, restricting interlayer Li[TM] migration.
Observed suppressed formation of vacancies and O-O dimers in transition metal layers.
Achieved enhanced structural reversibility, capacity, and voltage retention.

Conclusions:

Oxygen-stacking engineering is a viable strategy for improving cathode stability.
The face-shared configuration effectively mitigates detrimental structural rearrangements.
This approach offers a pathway to advanced lithium-ion battery cathodes.