Column rechargeable battery

KAIST develops copper sulfide anode Column rechargeable battery

Lithium-ion batteries are the mainstream of energy storage technology today and have been widely used in various 3C products and electric vehicles. However, the lithium metal content accounts for only 0.06% of the earth's crust, and the demand has increased significantly in recent years, leading to rising raw material prices. In addition, the safety properties have been criticized. Therefore, in addition to improving battery performance and reducing costs, some teams are also looking for batteries other than lithium-based.

Among them, sodium-ion batteries (SIBs) are rising stars. Since sodium and lithium metal are both alkaline metals with similar physical and chemical properties, lithium-ion battery technology and materials can be partially used in sodium batteries, but sodium-ion batteries have capacity and anode cycle stability problems, and there is still huge room for growth. Recently, the Korea Advanced Institute of Science and Technology (KAIST) successfully developed a copper sulfide anode sodium-ion battery, which is expected to further reduce the overall battery production cost and increase capacity, and allow sodium-ion batteries to move towards commercialization.

JongMinYuk and JeongYongLee of the KAIST Institute of Materials Science and Engineering jointly developed an anode material suitable for sodium-ion batteries. In research tests, the copper sulfide anode has a 1.5 times higher cyclability than the old material, and the manufacturing cost is expected to be reduced by 40%.

The research team has been committed to seeking anode materials with high conductivity and high theoretical capacity, and selected copper sulfide nanoplates. The team believes that this compound is easy to form alloys with sodium, so it is expected to increase battery capacity and extend cyclability.

The research analysis also pointed out that after adjusting copper sulfide through crystallography, room can be left for sodium insertion reaction. The test results show that compared with lithium ions in graphite, copper sulfide has a sodium metal ion insertion capacity that is about 1.5 times higher, and can also maintain 90% of the initial capacity after 250 charge and discharge cycles.

And the biggest advantage of sodium-ion batteries is that the content of sodium-ion batteries in the earth's crust is as high as 2.6%, ranking sixth among all minerals. The development of sodium-ion batteries will help reduce the overall battery cost, especially for 3C products, where battery costs account for 30% of the total.

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