Sodium ion batteries

History

2022

China leads sodium-ion battery development

Mass production of sodium-ion models will begin in 2023. A count of battery-related patents over the past 10 years shows China leading the way - accounting for more than half of all patents.

In December 2022, Chinese companies issued 5.4 thousand of 9.8 thousand patents in this area. At the same time, Japanese enterprises issued about 1.1 thousand patents, American - 719, South Korean - 595, Russian - 42.

In Russia, they learned how to turn hogweed into anode material for sodium-ion batteries

As it became known on October 24, 2022 Russia , they learned how to turn hogweed into anode material for sodium-ion batteries. This was succeeded by scientists from Lomonosov Moscow State University and. Skoltech

According to them, the hogweed material showed high efficiency and did not yield to materials from other raw materials. Scientists also propose to use hogweed in production because there is a lot of it.

Russia has learned to turn hogweed into anode material

We thought: it would be great to simultaneously get rid of this nasty weed and get something useful in return, "says co-author of the article Zoya Bobyleva from Moscow State University named after M.V. Lomonosov. - Solid carbon, which is used in the anodes of sodium-ion batteries, can be produced from any biomass: nut shells, paper waste, etc., but no one has tried hogweed yet. And it turned out that he fits well.

Sodium ion batteries are an alternative lithium-free energy storage technology. They can be used in electric buses or solar energy storage, experts say. It is assumed that the price of sodium batteries will be lower.

Solid carbon from hogweed made by scientists from Moscow State University and Skoltech demonstrated a Coulomb efficiency of 87%, which puts it on a par with the best materials of this class obtained from other raw materials. According to the second key indicator, specific capacity, it is inferior to the leading materials - 260 versus 300 mAh/g - but generally competitive.

First, scientists subjected the hogweed biomass to direct carbonization, that is, heating up to 1300 degrees Celsius in an oxygen-free atmosphere. Then the synthesis was repeated, but with the preliminary washing of the raw materials with acids to remove metal and other impurities - as a result, the coulomb efficiency of the material increased. The hogweed was then boiled in a closed water reactor to produce very small carbon-containing spheres. The specific capacity of the material in all three cases was similar, and the highest Coulomb efficiency is achieved in the second case.^[1]

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