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Updated: May 20, 2025

Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles

Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles

Published on: October 27, 2018

Strategy Formulation for Mitigating Capacity Fading of Na-Layered Oxides.

Jun Pan¹, Yanhong Liu², Yuanwei Sun^3,4

¹School of Materials Science & Engineering, Nanyang Technological University, Singapore, 639798, Singapore.

Angewandte Chemie (International Ed. in English)

|March 25, 2025

Summary

This summary is machine-generated.

Capacity fading in sodium-ion batteries is caused by iron dissolution and solvent decomposition. A novel additive, sodium bis(trimethylsilyl)amide, effectively suppresses iron dissolution, enhancing battery performance.

Keywords:

Capacity fading mechanism Lewis base additives Na‐layered oxide Sodium‐ion batteries Thermodynamically and kinetically

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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

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Published on: November 11, 2013

Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Layered oxide cathode materials are crucial for sodium-ion batteries.
Capacity fading mechanisms in these materials are not fully understood.
Iron dissolution and electrolyte decomposition contribute to performance loss.

Purpose of the Study:

To elucidate the capacity fading mechanism of NaFe1/3Mn1/3Ni1/3O2.
To identify effective electrolyte additives for improving capacity retention.
To propose strategies for enhancing sodium-ion battery stability.

Main Methods:

Theoretical calculations to screen electrolyte additives.
Identification of nitrogen-containing Lewis base additives.
Electrochemical testing of NaFe1/3Mn1/3Ni1/3O2//hard carbon cells with novel additives.

Main Results:

Capacity fading in NaFe1/3Mn1/3Ni1/3O2 is primarily due to iron ion dissolution.
Electrolyte solvent decomposition is induced by the electrochemical potential of the cathode.
Sodium bis(trimethylsilyl)amide significantly improves Coulombic efficiency and reduces iron dissolution.

Conclusions:

Iron dissolution is a key factor limiting the cycle life of NaFe1/3Mn1/3Ni1/3O2 cathodes.
Nitrogen-containing Lewis bases are effective electrolyte additives for sodium-ion batteries.
Sodium bis(trimethylsilyl)amide shows great promise for enhancing the stability and performance of sodium-ion batteries.