Highly conductive solid sodium electrolyte exhibiting exceptional electrochemical stability
In a groundbreaking development, a research team has developed a Cl-substituted NaSbS solid electrolyte for all-solid-state sodium-ion batteries. This discovery, published in the prestigious journal ACS Applied Energy Materials in 2021, could pave the way for the development of an ideal solid electrolyte with high ionic conductivity and superior electrochemical stability.
The study, with the DOI 10.1021/acsaem.1c00927, led by Hirotada Gamo, Nguyen Huu Huy Phuc, Hiroyuki Muto, and Atsunori Matsuda, found that the Cl-substituted NaSbS solid electrolyte exhibits improved electrochemical stability with Na metal anodes. This improvement is linked to a reduction in interfacial resistance between the anode and the solid electrolyte.
The research team discovered that the Cl substitution in NaSbS solid electrolytes leads to an improvement in the three-dimensional ion diffusion pathway. This improvement is the primary cause of the three-fold increase in ionic conductivity compared to the sample without a Cl substitution. The crystal structure of the Cl-substituted NaSbS has a framework that allows Na ions to move easier in three dimensions, contributing to the improved ionic conductivity.
Heavy Cl doping was found to be effective in improving stability with the anode, demonstrating the potential of this approach in the development of all-solid-state Na-ion batteries. The study proposes that the Cl-substituted NaSbS solid electrolytes could be combined with liquid-phase coating technology to achieve a high storage capacity and stable cycling for these batteries.
The first author of the publication describing the development of the chlorine-substituted NaSbS solid electrolyte for all-solid-state sodium-ion batteries is likely to be Zhichao Gan. The research could lead to the development of an ideal solid electrolyte for all-solid-state Na-ion batteries with high ionic conductivity and superior electrochemical stability.
This breakthrough could significantly advance the field of all-solid-state sodium-ion batteries, offering a promising solution for high-performance, stable, and environmentally friendly energy storage systems.
