Fixed, lithium batteries, which are also being used as the next-generation energy source for electric cars, are one step closer to being realized.
Researchers at Tokyo University of Technology, the AIST Research Institute, and Yamagata University significantly reduced the electrical resistance of a fixed lithium battery.
The high resistance resulting from the interaction of the positive electrode of the corresponding batteries, i.e. the target and the solid electrolyte, has been a problem whose origins have long been apricot. Resistance also increases as the target is exposed to air, reducing battery capacity and performance.
The research community has repeatedly tried to lower the resistance, but did not reach 10 Ohms per square centimeter. This value is the value of the interface resistance in the absence of air exposure.
Now, however, Japanese scientists managed to get very close, 10.3 Ohms per square centimeter.
The researchers reduced the resistance by making thin-film batteries that contained negatively charged lithium targets, positive lithium cobalt oxide targets, and solid lithium phosphate electrolytes.
Before assembling the batteries, the researchers exposed the lithium cobalt oxide sites to air, nitrogen and hydrogen gases, oxygen, carbon dioxide, and water vapor for half an hour.
To their surprise, the researchers found that exposure to nitrogen, oxygen, carbon dioxide and hydrogen did not reduce battery performance.
“Only water vapor greatly reduced the interaction between the lithium cobalt oxide target and the lithium phosphate electrolyte and increased the interfacial resistance more than tenfold compared to the non-gaseous interface,” said the professor who led the research team. Taro Hitosugi says EurekAlert! in an online publication.
Next, the researchers heat-treated the precipitated, negatively charged lithium cobalt targets containing the batteries for one hour at 150 degrees Celsius. In this way, the researchers reduced the resistance to the above value.
Examining the decrease in resistance value by simulations and measurements, the researchers concluded that the spontaneous removal of protons from a lithium cobalt oxide compound by heat treatment may be behind the phenomenon.
“Our research shows that lithium cobalt oxide protons play an important role in battery recovery. We hope that elucidating these microscopic processes at the interfaces will help develop solid lithium batteries, ”Hitosugi concludes.
A study by Japanese researchers has been published in a peer review ACS Applied Materials & Interfaces -julkaisussa.
Source: Tivi by www.tivi.fi.
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