10 time-energy density! Scientists develop silver-zinc oxide battery
Low battery energy density has always been an obstacle to the development of many industries. Recently, a new study may be able to solve this problem.
Researchers from the University of California, San Diego and California ZPower Corporation recently announced that they have developed a flexible rechargeable silver-zinc oxide battery with an area energy density that is 5 to 10 times that of existing technologies.
This battery is easier to manufacture. Most flexible batteries need to be manufactured in a vacuum under aseptic conditions, but this new battery can be screen printed under normal laboratory conditions. The device can be used for flexible and stretchable electronic devices and soft robots.
The energy density of this innovative battery is 50 milliamperes per square centimeter at room temperature-which is 10-20 times larger than the area capacity of traditional lithium-ion batteries. So for the same surface area, the battery described by Joule can provide 5 to 10 times the power.
The capacity of this new battery is higher than any flexible battery currently on the market. This is because the impedance of the battery is much lower. The lower the impedance, the better the battery's resistance to high current discharge.
A researcher said, "This area capacity is unprecedented, and the manufacturing process is economical and scalable."
New battery: The square under the white film is the new battery (Source: UCSDC)
This new battery successfully powers a flexible display system equipped with a microcontroller and a Bluetooth module, and its battery performance is also better than that of commercially available lithium-ion button batteries.
At present, this battery has been charged and discharged more than 80 times without showing any signs of capacity loss. Despite repeated bending and twisting, the battery still functions normally.
To make this battery, the researchers used ZPower’s proprietary cathode design and chemistry. The research team contributed their expertise in printable, stretchable sensors and stretchable batteries.
The unusually high energy density of this battery is due to silver zinc oxide (AgO-Zn). Most commercial flexible batteries use silver oxide (Ag2O), so their cycle life and capacity are not very good, which limits the application of these batteries in low-power, disposable electronic products.
The traditional view is that AgO is unstable. However, ZPower's AgO cathode material relies on a proprietary lead oxide coating to improve the electrochemical stability and conductivity of AgO. And AgO-Zn is the reason for the low impedance. The printed current collector of the battery also has excellent conductivity, which also helps achieve lower impedance.
However, due to its high degree of oxidization and rapid chemical degradation, AgO has never been used in screen printing batteries before. By testing various solvents and adhesives, researchers at the University of California, San Diego found an ink formulation that can make AgO suitable for printing.
Therefore, once the ink is ready, the battery can be printed out in a few seconds and can be used in a few minutes. The battery can also be printed using a roll-to-roll process, which will increase speed and increase scalability.
The battery is printed on a layer of chemically stable, flexible, high melting point (about 200°C) polymer film, which can be heat sealed. The current collector, zinc anode, AgO cathode and their corresponding separators each constitute a stacked screen printing layer.
Some researchers said that this kind of battery has a flexible shape and can be adjusted according to electronic equipment, which is different from the traditional method of adjusting electronic equipment according to the shape of the battery.
The first author of the study Jonathan Scharf (Jonathan Scharf) said, "With the rapid growth of the 5G and IoT markets, this new battery may compete with current commercial batteries for the next generation of consumer electronics. "
The team is already developing next-generation batteries, aiming to develop cheaper, faster, and lower impedance charging devices for use in high-power, customizable 5G devices and software robots.
Publisher: International Energy Network from：http://www.batterycloud.com.cn/newsDetail?infoId=305