High-entropy oxides: an emerging anode material for lithium-ion batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• High entropy oxides (HEOs) are emerging materials with significant potential in energy storage.
• HEOs, particularly those with rock-salt and spinel structures, demonstrate superior reversible capacity and cycle life compared to conventional conversion anodes.
• Current research on HEOs for electrochemical applications is still in its nascent stages.

Purpose of the Study:

• To review recent advancements in HEO materials for lithium-ion batteries (LIBs).
• To discuss synthesis methods and factors influencing HEO properties.
• To explore structural evolution and performance relationships in HEOs for energy storage.

Main Methods:

• Review of synthesis techniques for HEOs.
• Analysis of structural evolution in rock-salt and spinel HEOs during lithium storage.
• Correlation of material morphology, pseudocapacitance, and oxygen vacancies with electrochemical performance.

Main Results:

• HEOs with rock-salt and spinel structures exhibit excellent reversible capacity and extended cycle spans.
• Synthesis parameters critically influence HEO morphology and electrochemical properties.
• Understanding the interplay between morphology, pseudocapacitance, and oxygen vacancies is key to optimizing HEO performance.

Conclusions:

• HEOs represent a promising class of materials for next-generation LIB anodes.
• Further investigation into synthesis-structure-property relationships is crucial for HEO development.
• Addressing current challenges will pave the way for advanced HEO-based anodes in LIBs.