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In the near future, people will have a transparent mobile phone or e-reader.
According to the report of the "Proceedings of the National Academy of Sciences" published this morning, three Chinese teachers and students at Stanford University have developed a transparent lithium-ion battery to remove the last obstacle to the birth of transparent electronic products.
The shape of the transparent battery is like a “transparent screen windowâ€, which was recently completed by a researcher from the Department of Materials Science and Engineering at Stanford University, Associate Professor Cui Wei, and his doctoral students Yang Yuan and Hu Liangbing. It has many functions and Features, powerful, soft, stylish and inexpensive.
Conversion ideas
Grid-like electrodes are invisible to the naked eye
Previously, several companies have succeeded in producing partially transparent electronic products. However, key active materials in batteries cannot be made transparent.
A Japanese scholar and a professor at the University of Southern California developed transparent batteries in 2007 and 2009, respectively, but their energy density and storage power still cannot provide normal use of mobile phones and other electronic products. Full-transparent electronic devices are still only a conceptual stage.
Cui Wei’s research team switched ideas and changed the electrode structure to make this critical material invisible to the naked eye. The electrode of the transparent battery they developed is a grid-like structure. The width of each line in the grid is about 35 microns. Because a single line is so small, the light will pass through the transparent gap between the network lines, and the entire mesh area will look like. It is transparent.
Yang Yuan explained: “The limits of the human eye are between 50 and 100 microns. If the material is less than 50 microns, it is transparent to the human eye.â€
Fine design
Selected elastic material to make transparent electrolyte
To create this transparent battery, Cui Wei's team made a slick design. First, they chose the transparent and elastic compound polydimethylsiloxane as an alternative to opaque conventional materials such as copper or aluminum. Next, they modified a gel electrolyte to make both an electrolyte and a separator.
By placing a new transparent electrolyte exactly between the two electrodes, Cui Wei's research team created a functional transparent battery. Moreover, the transparent battery can be made larger and more functional by adding multiple layers. Strong. As long as the cable can be accurately matched, transparency can be maintained.
“A lot of layers of screens are put together and still a thin transparent screen. The transparency is not reduced, but the amount of electricity that can be provided can be continuously accumulated to meet the requirements of conventional electronic products.†Yang Yuan said. The light transmission test showed that the transparency of the battery in visible light was 62%; the transparency of three batteries stacked together was 60%.
Inventor Team
Cui Wei: 35 years old, from Guangxi, graduated from the Department of Chemistry, University of Science and Technology of China in 1996. After graduating from college, he went to the United States to pursue a Ph.D. in nano-applications at the Department of Chemistry, Harvard University. He is currently an associate professor of materials science and engineering at Stanford University. In 2003, he was awarded the Young Scientist Prize of the United States Miller, and possessed a number of patented inventions such as nanosensors.
Yang Yuan (Cui Wei's student): In 2003 he studied at the School of Physics, Peking University. In 2007, he received a full scholarship from Stanford University and went to the United States to pursue a Ph.D.
Hu Liangbing (student of Cui Wei): After graduating from the University of Science and Technology of China in 2002, he went to the University of California, Los Angeles to pursue physics, and received his doctorate in 2007.
Soft texture
Low cost and bendable
Mobile phone wrist wear is expected to come true
The lithium-ion battery is very soft and bendable, providing the possibility for the birth of a concept phone. "Wearing a mobile phone on the wrist" is expected to come true.
The most important is that its cost is comparable to that of conventional batteries, and it is expected to "strengthen in the field of consumer electronics."
For the birth of transparent batteries, Cui Hao optimistically stated that the invention has multiple meanings. For the scientific community, optical reactions can be used to detect and analyze the reactions in batteries. For the industry, full-transparent electronic products are just around the corner; For consumers, "Imagine having a transparent mobile phone!" (Wenyi, trainee reporter Cheng Lei, Intern Jiang Yijin)
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