Korea Institute of Science and Technology develops copper sulfide anode sodium ion battery

Lithium-ion batteries are the mainstream of today's energy storage technology, and have been widely used in various types of 3C products and electric vehicles, but the lithium metal content only accounts for 0.06% of the earth's crust, and the demand in recent years has increased greatly, leading to an increase in the price of raw materials, plus the safety is criticized, so in addition to improving battery performance and reducing costs, there are also teams looking for batteries other than lithium.

Among them, sodium ion battery (SIB) is a rising star. Because sodium and lithium metal are both base metals, the physicochemical values are similar. The lithium ion battery technology and materials can be used for sodium batteries, but sodium ion batteries have capacity and anode cycle stability. There is still a huge room for growth. Recently, the Korea Institute of Science and Technology (KAIST) successfully developed a copper sulfide copper anode battery, which is expected to further reduce the overall battery production cost and increase capacity, and let the sodium ion battery move toward commercialization.

JongMinYuk and JeongYong Lee of KAIST Materials Science and Engineering Institute jointly developed an anode material suitable for sodium ion batteries. In research and testing, copper sulfide anode circulation is 1.5 times higher than that of old materials, and manufacturing cost is expected to be reduced by 40%. .

The research team has been working for anode materials with high conductance and high theoretical capacity, and selected copper plated nanoplates. The team believes that the compound is easy to alloy with sodium, so it is expected to increase battery capacity and Extended circulation.

The study also pointed out that after adjusting the copper sulfide by crystallographic, it can leave room for the sodium insertion reaction. The test results show that compared with the lithium ions in the graphite, the copper sulfide sodium metal ion implantation ability is about 1.5 times higher, and the initial capacity can be maintained at 90% after 250 charge and discharge cycles.

And sodium ion battery has one of the biggest advantages, that is, the crust content is as much as 2.6%, and the content of the nano-cell is ranked sixth. The development of sodium-ion battery helps to reduce the overall battery cost, especially for 3C products, the battery cost accounts for 30. %.

Yuk pointed out that in recent years, there have been air quality problems in South Korea, and people have shown great interest in renewable energy-related products. Therefore, this research can give South Korea a head start in energy products. The study is currently published in Nature Communications.

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