The company's sodium battery products mainly polyanion route, has achieved small batch production.
At present, the company has three teams in the research and development of sodium ion batteries, including layered oxide, polyanion system and other technical routes, especially in the polyanion route of sodium vanadium phosphate (Na3V2(PO4)3) material has made great progress.
1) High energy density: theoretical specific capacity up to 120mAh/g.
2) Good stability and cycling performance: the highly open three-dimensional structure makes sodium ions migrate in a large space, and the stable "lantern" structure makes it have high thermal stability, which is an ideal sodium cathode material.
Sodium batteries work similarly to lithium batteries, which can help accelerate their industrialization. Sodium battery is a device that is embedded back and forth between the positive electrode and the negative electrode materials through Na + to realize the mutual conversion of chemical energy and electric energy.
When the sodium battery is charged, the positive electrode oxidizes, and the electrons reach the anode along the external circuit. At the same time, Na + is disembedded from the positive electrode, passes through the electrolyte and inserts through the diaphragm into the negative electrode, and the negative electrode is in a sodium-rich state. When the battery is discharged (as we use the battery process), the Na + embedded in the negative electrode carbon layer comes out and moves back to the positive electrode.
Similar working principles can help put some of the experience into the development of sodium batteries to accelerate their industrialization. At present, sodium batteries may be shipped in mass production in 2023, and they will usher in mass production applications in 2024.
With their good energy density, safety, cycle life and low cost advantages, sodium batteries are mainly used in low-speed power and energy storage fields. The industrialization acceleration is expected to form a strong competition with lithium iron phosphate batteries, and jointly promote the healthy development of the new energy industry.
1) Cost economy: Sodium battery has been born for a long time, which was first proposed in the 1980s, and the technology level is becoming increasingly mature after years of development. Since the second half of 2021, the price of lithium salt has climbed to a record high of 500,000 yuan per ton, thus causing industry concerns about the supply and cost of upstream core raw materials.
Sodium resources are rich and evenly distributed, and the sodium reserves in the earth's crust reach 2.74% and are distributed around the world (lithium reserves are only 0.0065% and mainly concentrated in Australia, Chile and other countries), so the cost of sodium salt is more advantageous, and the average price in 2022 is less than 3,000 yuan / ton. In addition, the sodium battery anode can use cheaper aluminum foil to further reduce costs. Zhongkehai sodium expects sodium battery material costs or 30% -40% lower than lithium batteries.
2) Good overall performance: the energy density of sodium battery is much higher than that of lead-acid battery, but slightly inferior to that of lithium iron phosphate battery. At present, the mainstream energy density of lithium iron phosphate battery monomer is about 170Wh / kg, while the energy density of sodium battery developed by various manufacturers is about 140Wh / kg. The single energy density of the first generation of sodium battery launched by Ningde Times can be as high as 160Wh / kg. With the continuous breakthrough of technology, the energy density of sodium battery still has a large room for improvement.
In addition, sodium batteries have excellent thermal stability and low temperature performance, so that they can be applied in the energy storage field. However, sodium batteries are relatively difficult due to a large radius, resulting in low cycle performance.