According to foreign media reports, researchers at Washington State University (WSU) and Pacific Northwest National Laboratory (PNNL) have developed a sodium ion battery, and its energy storage capacity and chemical properties are similar to certain commercial lithium. Ion batteries are comparable, making it possible to use rich and inexpensive materials to create a viable battery technology.
(Source: Washington State University)
The research team reported one of the best results achieved so far on sodium ion battery research. The capacity of this battery is similar to that of some lithium ion batteries and can be successfully charged. It can still maintain more than 80% after 1000 charge and discharge cycles. Of electricity.
Lithium-ion batteries are ubiquitous and widely used in mobile phones, notebook computers, and electric vehicles, but they are usually made of rare and expensive materials such as cobalt and lithium. As the demand for electric vehicles and electricity storage increases, such materials become more difficult to obtain and may become more expensive. In addition, lithium batteries also have problems in meeting the growing energy storage needs of the power grid.
On the other hand, sodium ion batteries are made of cheap, abundant, and sustainable sodium from the earth’s oceans or crust, and can be a good candidate for large-scale energy storage. Unfortunately, the energy storage capacity of sodium ion batteries is not as good as that of lithium batteries. In addition, sodium ion batteries have problems in charging, but in order to effectively store energy, they need to have charging capabilities. This most promising cathode material will always encounter a key problem, that is, an inactive sodium crystal will form on the surface of the cathode to prevent the flow of sodium ions and eventually the battery will fail.
As part of the study, the research team created a layered metal oxide cathode and a liquid electrolyte containing additional sodium ions to create a more concentrated sodium ion solution that can better interact with the cathode. The research team’s cathode design and electrolyte system allowed the sodium ions to continue to move, preventing the formation of inactive surface crystals and allowing the battery to generate electricity unimpeded.
Now, researchers are working to better understand the important interaction between the electrolyte and the cathode, so that different materials can be used to improve battery design. In addition, the researchers also want to design a battery that does not use cobalt, because cobalt is also a relatively expensive and rare metal.
The researchers said: "This study paves the way for practical sodium-ion batteries. The basic insights we have gained about the cathode-electrolyte interaction are for the future development of cobalt-free or cobalt-less cathodes in sodium-ion batteries. materials, research and development and other battery chemistries provide the basic ideas if we can find viable alternatives to replace the lithium and cobalt, sodium-ion batteries can really compete with the lithium-ion battery. ". (author: Yuqiu Yun)
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