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Updated: May 30, 2025

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
Bimetallic Sulfides Cr0.99V1.8S4 with Loosely Packed Structure: Exploring the Boundary of Conversion and
Keyan Hu1, Wen Chen1,2, Youtan Pan1
1School of Mechanical and Electrical Engineering, Jingdezhen Ceramic University, Jingdezhen 333403, China.
Abstract:
Metal sulfide electrodes for sodium-ion batteries face trade-offs among high capacity, fast kinetics, and stability. The challenge lies in breaking and restoring metal-sulfur bonds and allowing rapid ionic transport. Here we explore the boundary of conversion- and intercalation-type metal sulfides to develop ideal sodium-ion storage materials. We focus on sulfides of vanadium and chromium because of their adjacent atomic numbers but different energy storage mechanism. Among various sulfides of vanadium and chromium, a loosely packed bimetallic sulfide, Cr0.99V1.8S4, with cationic vacancies and metallic conductivity (4.28 S m-1), shows optimal sodium-ion storage performance: an initial Coulombic efficiency of 95.6%, a reversible capacity of 551 mAh g-1 at 1.6 C, and maintaining 100% capacity after 600 cycles at a high rate of 16-66 C.
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