Researchers invent new sodium ion conductors for solid-state sodium ion 14250 battery

According to foreign media reports, researchers have designed and invented a new sodium ion conductor that can be used in solid-state sodium ion 14250 battery. The conductor remains stable when combined with a high-voltage oxide cathode, greatly improving the efficiency and service life of such 14250 battery. It is reported that the conceptual battery made with this new material can be cycled more than 1,000 times while maintaining up to 89.3% of its capacity, far outperforming other solid-state sodium 14250 battery.

Solid-state 14250 battery are expected to become safer, cheaper and longer-lasting 14250 battery, especially sodium ion chemical 14250 battery. Because sodium is cheap and abundant, while the lithium in lithium-ion 14250 battery is not only low in content, but also has high mining costs and damages the environment. The purpose of this study is to create 14250 battery that can be used for large-scale grid energy storage applications, especially to store electricity from renewable energy, thereby alleviating peak demand.

(: Nature Communications)

"Industry wants 14250 battery to cost $30 to $50 per kilowatt-hour, which is about one-third to one-fifth of the current cost of 14250 battery. And we will definitely reach this goal," said Shirley Meng, a professor of nanoengineering at the University of California, San Diego and the corresponding author of the paper. The research was jointly completed by the University of California, San Diego and Santa Barbara, Stony Brook University, TCG Research and Education Center, TCG Technology Research and Education Center in Kolkata, India, and Shell International Exploration Ltd.

Through rapid iterations between calculations and experiments, researchers at the University of California, San Diego identified a class of sodium halide conductors composed of sodium, yttrium, zirconium and chloride, and named it NYZC. It is not only electrochemically stable, but also chemically compatible with the oxide cathode used in high-voltage sodium-ion 14250 battery. The group then worked with researchers at the University of California, Santa Barbara to study the structural characteristics and performance of this new material.

NYZC is based on Na3YCl6, which is not a very good sodium conductor. The researchers suggest using zirconium instead of yttrium, which would create vacancies and add volume to the battery cell, thereby adding sodium ion conductivity. The researchers also pointed out that as the volume increases, the zirconium and chloride ions in this new material combine to rotate, resulting in more sodium ion conduction pathways. In addition to adding conductivity, the halide material is more stable than other materials currently used in solid-state sodium 14250 battery.

The researchers said: "The above findings show that halide ion conductors have great potential for solid-state sodium ion battery applications. At the same time, it also proves that large-scale material data calculations combined with machine learning may have a significant impact on the material discovery process." Next, the researchers will continue to explore other alternatives to these halide materials, improve the overall power density of the battery, and strive to expand production.

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