(Source: KAIST official website)
Lithium-ion batteries (LIBs) have been widely used in a variety of electrochemical energy storage applications since their introduction to the market, including mobile devices, electric vehicles, and energy storage systems (Ess). However, as demand has increased, its prices have also increased in the past few years. Due to its high natural reserves, low cost, and similar chemical properties to lithium, sodium ion batteries (SIBs) are expected to become a replacement for lithium ion batteries. People are more and more interested in SIB batteries, but due to the lack of suitable electrode materials, the commercialization of SIB batteries is far from being realized.
According to foreign media reports, researchers from the Korea Advanced Institute of Science and Technology (KAIST) have proposed a new strategy to use copper sulfide as the electrode material to extend the cycleability of sodium ion batteries. Using this material can promote the high-performance conversion reaction of SIB batteries, and is expected to realize the commercialization of SIB batteries.
The team led by Professor Jong Min Yuk confirmed the use of copper sulfide to stabilize the sodium storage mechanism. Copper sulfide is an excellent electrode material. Because of its unique resistance to crushing conversion reaction mechanism, it has high capacity, high rate and long cycle cycling ability, thereby promoting capacity recovery. The research results show that when using copper sulfide, the sodium ion battery is charged once a day, and the service life can reach more than 5 years. Moreover, copper sulfide is rich in natural materials such as copper and sulfur, and has better cost competitiveness than lithium-ion batteries, which use lithium and cobalt.
Lithium ion batteries use intercalation materials such as graphite as the negative electrode. Due to insufficient intercalation distance, these materials cannot store large amounts of sodium. Therefore, people began to explore conversion and alloying reaction-type materials to meet the high-capacity needs of the negative electrode part. However, unlike the intercalation reaction, in the conversion and alloying reactions, the volume expansion of the material is usually large, and the crystals will suddenly change, thereby destroying the active material, resulting in severe capacity degradation.
The research team found that in the conversion reaction, the semi-coherent phase interface and the grain boundary play a key role in achieving crush-resistant conversion reaction and capacity recovery. Copper sulfide produces a semi-coherent phase interface through progressive crystal changes, which ultimately prevents the particles from being crushed. Based on this unique mechanism, the researchers confirmed that copper sulfide has high capacity and high cycle stability regardless of size and shape. Professor Yuk said: "The use of copper sulfide can promote the development of sodium ion batteries, help to develop low-cost energy storage systems, and solve the dust problem."
Pyrite as Fillers Used in Steelmaking and Core-Spun Yarn
Steel-making/casting core-clad wire (filling material)
Place of Origin: Henan Luoyang, China
Pyrite, Iron pyrites , pyrites lump, Ferro sulphur, Pyrites powder.
Product Description:
Detailed introduction: Is used as the filling material of cored wires and resulfurization additive agent for steel-making and casting. It is used for adding sulfur element in steel smelting to improve the cutting performance, inoculation effect, graphite shape and mechanical properties of gray pig iron.
Quality:
S: 48%min, FE: 42%min, SIO2: 3.0%max, PB: 0.1%max,
ZN: 0.1%max, AS: 0.1%max, . C: 0.3%max, CU: 0.2%max,
H20: 1.0%max, SIZE: 95%min
Granularity: (0-3)mm/(3-8)mm/(3-15)mm/(15-50)mm or other particle size.
Packing: 25KG/500KG/1000KG/BAG or 1000KG/BAG or other packaging.
Note: if there are special requirements, the product can be customized according to clients` requirements.
Steel-making/casting Core-clad Wire --BXX
Pyrite, Iron pyrites, pyrites lump, Ferro sulphur, Pyrites powder.
LUANCHUAN COUNTY HENGKAI METALLURGICAL MATERIALS SALES CO.,LTD , https://www.pyritechina.com