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release time:2024-08-01 Hits: Popular:AG11 battery
"Sodium powder" can make high-performance cr2032 button battery
Most of today's batteries use rare lithium mined from the mountains of South America. If this source of lithium runs out, then battery production may stagnate. Sodium is a cheap and abundant alternative to lithium in batteries. But if sodium is exposed to water, even just water in the air, it turns purple and flammable.
Currently, in order to make cr2032 button battery function like lithium-ion batteries, researchers around the world have successfully controlled sodium's explosive tendencies, but have not yet solved the problem of sodium ions "losing" during the initial charge and discharge of cr2032 button battery. Now, Purdue University researchers have developed a sodium powder that can solve the above problems and correctly control the charge.
Vilas Pol, an associate professor in the Department of Chemical Engineering at Purdue University, said that adding sodium powder during electrode processing only requires slight modifications to the battery production process. This is a potential way to advance sodium-ion battery technology to the industry. The researchers published their scientific research results in the journal "Power Sources".
Although cr2032 button battery are physically heavier than lithium-ion batteries, researchers have been studying them because they have the potential to store energy generated by large solar and wind power facilities at a lower cost. The problem is that sodium ions tend to cling to the carbon-based anode in the battery during the initial charging cycle, preventing the ions from migrating to the cathode. These ions accumulate into a structure called a "solid electrolyte interface."
"Normally, a solid electrolyte interface is good because it protects the carbon particles from the battery's acidic electrolyte," Pol said. "But too much of the interface consumes the sodium ions needed to charge the battery."
The Purdue researchers suggest using a sodium powder that provides the solid electrolyte interface with the amount of sodium needed to protect the anode but does not accumulate in a way that consumes the sodium ions.
They made the sodium powder in an argon-filled glove box to minimize exposing the sodium to moisture, which reduces burning. They used ultrasound to melt the sodium chunks, forming a milky purple liquid, which was then cooled into a powder and then suspended in a hexane solution to evenly disperse the powder particles.
Just a few drops of a sodium suspension on the anode or cathode during the manufacturing process allow cr2032 button battery to charge and discharge with greater stability and higher capacity, the minimum requirements for a functional battery.
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