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What are the advantages compared to the sodium ion battery and lithium battery?

Return Listsource:Gratene date: 2022-06-17

What are the advantages compared to the sodium ion battery and lithium battery?Sodium ion battery technology is an effective supplement of lithium-ion batteries, but since its theoretical energy density is lower than the ternary lithium battery, the short board or will result in a large-scale application in high-end models. Therefore, sodium ion batteries are expected to replace some of the lithium-ion batteries in the energy storage market and the low-end power battery market.

In terms of sodium ion batteries, it mainly has three major advantages: First, sodium is the sixth rich element in the crust (top 6: oxygen, silicon, aluminum, iron, calcium, sodium), and rich sodium resources in the ocean. The sodium elements are very uniform, and the sodium content in the earth accounts for about 2.5% to 3.0%, which is about 1000 times of lithium elements; second, sodium ions do not form alloys with aluminum, so the negative electrode of sodium batteries can be metallic Aluminum foil is used as a collector, and the double aluminum agglomerates do not exist (lithium ion battery negatives are larger than aluminum with copper set fluid, weight and price). Further, the electrical conductivity of the sodium salt is higher than that of the lithium salt, and the electrolyte concentration of the sodium ion battery can be lower than that of the lithium ion battery, so the sodium ion battery can reduce costs with low concentrations of electrolytes.

But at the same time, as a new attempt in the field of new energy vehicle batteries, there are still some problems in R & D and application in terms of research and development and application. From the principle, the ionic radius of sodium ions are larger than lithium ions, causing sodium ions to embed graphite materials, sodium ion batteries require hard carbon or other negative electrode materials, and the energy density is below graphite materials.

From the perspective of performance, a larger size makes the sodium ions are difficult to embed in the electrode crystal structure where the chemical reaction is located, resulting in a slow rate of sodium ions, affecting the sodium ion battery, discharge rate. At the same time, the crystal structure of the sodium ion-ejection electrode is also more difficult, resulting in poor battery inverability, low energy density utilization rate, and the energy density after multiple charge and discharge is faster. At present, the mainstream sodium ion battery positive electrode material is NAMNO4, NA3V2 (PO4) 3, Na2FE2 (SO4) 3, etc., theoretically energy density does not have a ternary lithium, but the actual energy density is lower than the lithium iron phosphate.

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