The world's smallest battery that is smaller than a grain of salt

Computers are becoming smaller and smaller, and batteries are being developed to power smaller microelectronic terminals, such as bioadaptive sensor systems that are built into the body. The world's smallest battery newly announced by the research team is an ultra-small size of about one grain of salt.

On-Chip Batteries for Dust-Sized Computers --Li ---- Advanced Energy Materials --Wiley Online Library

World's smallest battery can power a computer the size of a grain of dust

Dr. Oliver G. Schmidt, a professor of nanoelectronics material systems at Chemnitz University of Technology, is working with researchers at the Leibniz Institute for Solids and Materials and the Institute for Applied Chemistry, Director of the Chinese Academy of Sciences to develop ultra-small batteries. increase.

In order to realize a computer with a very small size of less than 1 square millimeter, it is necessary to develop a small size battery that can be used with this or invent a method for generating electricity. As a method for generating electricity, a method of converting heat into electricity has been proposed, but there is a problem that the output is too low. Other methods of converting light and vibration into electricity have been devised, but the problem is that they are not always available energy sources everywhere. In the case of a biocompatible sensor system that is embedded in the human body, it is necessary to constantly supply electric power, so it is better to use a very small battery than a technology that generates electricity by itself.

However, the production of tiny batteries is very different from regular batteries. For example, button batteries, which are compact batteries with high energy density, are manufactured using wet chemistry, where electrode materials and additives (carbon materials and binders) are processed into a slurry and coated on metal leaf. Manufacturing on-chip microbatteries in the same way can achieve excellent energy and power density, but the footprint will be significantly over 1mm2.

On-chip microbatteries also often have insufficient energy storage due to stacked thin films, electrode pillars, and alternating microelectrodes, resulting in a footprint of less than 1mm2. It seems that it will be very difficult to suppress.

Dr. Schmidt has designed a battery with a very small size of less than 1 square millimeter that solves these problems. The energy density of this tiny battery developed by the research team is 100 microkW per square centimeter.

Dr. Schmidt and his team are rolling up current collectors and electrode strips on a microscale to make the world's smallest battery. This is a so-called ' Swiss roll battery ', which is made by coating the wafer surface with a thin film made of polymer, metal, or dielectric material in layers. The research team claims that Swiss roll batteries are compatible with already established chip manufacturing technologies, making it possible to produce high-throughput microbatteries on wafer surfaces.

Using this method, the research team has succeeded in producing 'a rechargeable microbattery that can power the world's smallest computer chip for continuous measurement of local ambient temperature for about 10 hours.' increase. This tiny battery has the potential to play an active role in fields such as IoT, miniaturized medical implants, microrobot systems, and ultra-flexible electronics.

The research team also said, 'Since this technology still has great optimization potential, we can expect to have a much more powerful microbattery.'

in Science, Posted by logu_ii