Sodium ion batteries that we 've overlooked.

As early as the 1980s, sodium ion batteries and lithium ion batteries have been studied. With the successful commercialization of lithium ion batteries, the research on sodium ion batteries has gradually slowed down. At present, lithium-ion batteries can be described as "the lithium-ion batteries", but with the arrival of electric vehicles and smart grids, the large-scale development of lithium-ion batteries will be constrained by the bottleneck of lithium resource shortage. Compared with lithium, sodium reserves are abundant, widely distributed, low-cost, and have similar physicochemical properties to lithium. Therefore, the research on sodium ion batteries has once again received extensive attention from the scientific research and industrial circles.

The principle of sodium ion batteries is similar to that of lithium ions. When charged, Na + is removed from the positive electrode material, and the negative electrode material is embedded in the electrolyte. At the same time, the electrons are transferred to the negative electrode through the external circuit to maintain charge balance; When discharging, it is the opposite. Compared with lithium-ion batteries, the advantage of sodium ion batteries is that they are rich in resources -- sodium resources account for about 2.64 % of the reserves of crustal elements, and they are cheap and widely distributed. However, the threshold of sodium ion battery technology is higher than that of lithium electricity, and its core materials, assembly processes, etc., are not simple transplantation of technology. Therefore, there are relatively few companies and institutions for in-depth research, and sodium ion batteries are also Not widely promoted. In addition, there are some deficiencies in the performance of sodium ion batteries. For example, in terms of volumetric energy and specific power, there is room for further improvement in the future.

The development of sodium ion batteries has also achieved good results in recent years. At the end of 2015, a French research team made a major improvement in rechargeable battery materials, and for the first time developed an industry-standard 18650 sodium ion battery. In 2015, Liyunming, a doctoral student at the Institute of Physics of the Chinese Academy of Sciences, and Huyongsheng, a researcher, made breakthroughs in carbon-based negative materials for sodium ion batteries, using cheaper anthracite as a precursor, through simple crushing and One step carbonization gives a carbon negative material with excellent sodium storage properties.

It is understood that sodium ion batteries have strong stability, high safety, long service life, wide range of applications, easy to obtain raw materials, and simple waste recycling technology and no pollution. The development of low-cost sodium ion battery is expected to be applied to low-speed electric vehicles and realize lead-free low-speed electric vehicles. In foreign countries, sodium ion batteries are mainly used in areas where safety requirements are high, such as public transportation systems, communication base stations, home energy storage, and grid energy storage.

With the vigorous development of the battery industry, relevant institutions and enterprises at home and abroad continue to develop new technologies to occupy the commanding heights before the outbreak of the industry.

According to overseas media reports, Toyota's newly developed sodium ion technology can effectively increase the range of electric vehicles -- up to an astonishing 1000 kilometers(620 miles), and the price is even lower. Toyota's new battery is a sodium ion battery that uses a nature-based compound as a positive electrode, and the battery produces a voltage of 30 % of Gaochu's lithium ion battery. Toyota is speeding up research to put it into practical use around 2020. According to the report, once the battery is commercialized, it will be cheaper than traditional lithium batteries.

Bic batteries have also revealed that its research and development of sodium ion batteries has entered the pilot stage, and technical improvements have been made to the low energy density of sodium ion batteries to reduce people's car costs.

On January 18, 2017, Chaowei Group and General Electric Company(`` GE ") held a signing ceremony for Durathon sodium battery joint venture cooperation project in Changxing, Zhejiang Province. Combining their respective industrial and technological advantages, the two sides jointly established a joint venture company to expand the application field of sodium and salt batteries and took a crucial step in tapping the domestic energy storage market. After years of research and development, Durthon sodium battery technology has been commercialized. It has the characteristics of stable product nature, high safety(no combustion or explosion), high energy density, and long service life. At present, GE has established energy storage projects such as solar energy, wind power combination, peak management, and communication base stations in 25 countries around the world.

In the power battery market, different technology routes are developing at the same time. Batteries of different technology routes have their own specific market segments. Sodium ion batteries may be used in public transport systems and low-speed electric vehicles in the future. At present, the field of energy is undergoing a great transformation, especially with the deepening of power system reform in our country, the rise of the energy Internet, the increasing contradiction between power supply and demand, and the problem of abandonment of power, the storage of energy will play an indispensable role in the future power system. The application value of sodium ion batteries in the fields of renewable energy dissipation, distributed energy storage power stations, peak peak filling and other fields has received more and more attention. With the Advancement of sodium ion battery research and development technology and the reduction of process costs, its future The market is worth looking forward to.

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