High-Entropy Oxides for Rechargeable Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• High-entropy oxides (HEOs) are recognized for their unique structural attributes, tunable compositions, entropy-driven stabilization, and high ionic conductivity.
• These properties make HEOs highly promising for energy conversion and storage applications, particularly in rechargeable batteries.
• A comprehensive review is needed to consolidate current knowledge and address challenges for researchers.

Purpose of the Study:

• To provide a comprehensive overview of the current state and challenges of high-entropy oxides in rechargeable batteries.
• To distill the structural characteristics, ionic conductivity, and entropy stabilization effects of HEOs.
• To explore the diverse applications of HEOs in various rechargeable battery chemistries and components.

Main Methods:

• Literature review and synthesis of existing research on high-entropy oxides.
• Analysis of structural features, intrinsic properties, and synthetic methodologies of HEOs.
• Examination of HEOs' performance as anode/cathode materials, electrolytes, and electrocatalysts in rechargeable batteries.

Main Results:

• HEOs exhibit significant potential due to their structural complexity and enhanced ionic transport.
• Applications span lithium-ion, sodium-ion, and lithium-sulfur batteries, covering electrodes, electrolytes, and catalysts.
• Key challenges include optimizing structural stability and electrochemical performance for practical applications.

Conclusions:

• High-entropy oxides represent a rapidly evolving field with substantial promise for next-generation rechargeable batteries.
• Further research is crucial for designing and optimizing HEO compositions to improve battery performance and longevity.
• This review serves as a guide for researchers aiming to advance HEOs in energy storage and conversion.