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Related Experiment Video

Updated: May 12, 2025

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

Published on: May 29, 2018

High-Entropy Modulation on Na-O Configuration Toward Ultrastable Sodium Layered Oxide.

Hao Chen¹, Ziming Wang¹, Yu Shi¹

¹School of Materials Science and Engineering, Beihang University, Beijing, 100191, China.

Small (Weinheim an Der Bergstrasse, Germany)

|May 9, 2025

Summary

This summary is machine-generated.

High-entropy layered oxides enhance sodium-ion battery cathode stability. This new material, HE-NaMFN, shows ultrastable performance after 30 days of air exposure, improving sodium storage capabilities.

Keywords:

Na‐O configuration air stability high‐entropy modulation layered metal oxide sodium‐ion batteries

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Published on: February 8, 2018

Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

O3-type layered oxides are promising for sodium-ion batteries (SIBs).
Poor stability due to Na-O bond degradation and side reactions in moist air limits their application.
Developing stable cathode materials is crucial for advancing SIB technology.

Purpose of the Study:

To develop a novel O3-type high-entropy layered oxide (HE-NaMFN) for enhanced stability in SIBs.
To investigate the effect of high-entropy modulation on the structural and electrochemical properties of cathode materials.
To improve the air stability and cycling performance of sodium-ion battery cathodes.

Main Methods:

Synthesized a new O3-type high-entropy layered oxide NaMn0.4Fe0.3Ni0.2M0.1O2 (HE-NaMFN, M = Cu/Ti/Zn/Sn/Sb) via high-entropy modulation.
Characterized the material's structure, electronic properties, and air stability.
Evaluated the electrochemical performance, including reversible capacity, rate capability, and cycling stability in SIBs.

Main Results:

The high-entropy modulation increased the energy gap between O 2p and metal d orbitals (Δp-d) from 0.8 to 1.0 eV.
Reduced hybridization between oxygen and metal atoms led to a weakened metal-O interaction.
The HE-NaMFN material exhibited ultrastable performance, remaining stable after 30 days of air exposure.
Achieved a reversible capacity of 156 mAh g⁻¹, with 90% capacity retention, good rate capability, and long-term cycling stability.

Conclusions:

High-entropy modulation is an effective strategy to enhance the air stability of O3-type layered oxides for SIBs.
The weakened metal-O interaction in HE-NaMFN suppresses Na-O bond degradation and improves structural reversibility.
HE-NaMFN demonstrates significant potential as a stable and high-performance cathode material for sodium-ion batteries.