According to a report by the American Physicist Network on July 25, American scientists pointed out in the first issue of the Proceedings of the National Academy of Sciences that they have developed a transparent lithium-ion battery that is very flexible and, The cost is comparable to that of conventional batteries, and it is expected to “extend the gap†in the field of consumer electronics.
Previously, several companies have successfully produced partially transparent electronic products, such as digital photo frames and mobile phones with transparent keyboards. However, since the key active materials in the battery have not been made transparent or replaced with transparent materials, fully transparent e-book readers or mobile phones have not yet appeared. Now, Cui Yi, an associate professor in the Department of Materials and Engineering at Stanford University, and his graduate student Yang Yuan have developed a “transparent lithium-ion battery†that is a step closer to people.
The electrode of the transparent battery is a grid-like structure, and each line in the grid has a width of about 35 micrometers (the resolution of the human eye is between 50 and 100 micrometers. If the material is less than 50 micrometers, it is transparent to the human eye. Because the single line is so small, the light will pass through the transparent gap between the network lines, and the entire mesh area appears to be transparent.
In order to manufacture the transparent battery, Cui Yi and Yang Yuan designed a delicate and unique three-step process. First, they chose a transparent and flexible compound, polydimethylsiloxane (PDMS), to replace opaque conventional materials such as copper or aluminum. PDMS is very cheap, but it is not electrically conductive. To this end, they pour PDMS into a silicon model to create a grid-like groove, and then let the vapor generated by the metal film float above the groove to create a conductive layer. Subsequently, they poured a solution containing a nanoscale effective electrode material into the trench to make an electrode. Next, Yang Yuan changed a gel electrolyte to make both an electrolyte and a separator. This is a critical step because the materials used in the conventional battery are opaque.
Cui Yi and Yang Yuan created a functional transparent battery by placing a new transparent electrolyte between the two electrodes. Moreover, the transparent battery can be made larger and more powerful by adding multiple layers. .
Transparency can be maintained as long as the network cable is precisely matched. The light transmission test showed that the battery had a transparency of 62% in visible light; the three cells were laminated together with a transparency of 60%, and the entire battery was very soft. More importantly, the cost is the same as for a regular battery.
Yang Yuan said: "The limitation of ** is that the energy density of this transparent battery is lower than that of ordinary lithium batteries, which is similar to that of nickel-cadmium batteries." Most laptops and mobile phones are powered by lithium batteries; nickel-cadmium batteries are mainly used for Digital cameras and other devices with lower energy density. However, the energy density of the transparent battery can be continuously improved by improving the material properties.
Cui Yi has applied for a patent for the battery and is optimistic that transparent batteries are very important for basic research; we also hope to cooperate with Apple to enable people to have transparent Apple phones in the future.
Previously, several companies have successfully produced partially transparent electronic products, such as digital photo frames and mobile phones with transparent keyboards. However, since the key active materials in the battery have not been made transparent or replaced with transparent materials, fully transparent e-book readers or mobile phones have not yet appeared. Now, Cui Yi, an associate professor in the Department of Materials and Engineering at Stanford University, and his graduate student Yang Yuan have developed a “transparent lithium-ion battery†that is a step closer to people.
The electrode of the transparent battery is a grid-like structure, and each line in the grid has a width of about 35 micrometers (the resolution of the human eye is between 50 and 100 micrometers. If the material is less than 50 micrometers, it is transparent to the human eye. Because the single line is so small, the light will pass through the transparent gap between the network lines, and the entire mesh area appears to be transparent.
In order to manufacture the transparent battery, Cui Yi and Yang Yuan designed a delicate and unique three-step process. First, they chose a transparent and flexible compound, polydimethylsiloxane (PDMS), to replace opaque conventional materials such as copper or aluminum. PDMS is very cheap, but it is not electrically conductive. To this end, they pour PDMS into a silicon model to create a grid-like groove, and then let the vapor generated by the metal film float above the groove to create a conductive layer. Subsequently, they poured a solution containing a nanoscale effective electrode material into the trench to make an electrode. Next, Yang Yuan changed a gel electrolyte to make both an electrolyte and a separator. This is a critical step because the materials used in the conventional battery are opaque.
Cui Yi and Yang Yuan created a functional transparent battery by placing a new transparent electrolyte between the two electrodes. Moreover, the transparent battery can be made larger and more powerful by adding multiple layers. .
Transparency can be maintained as long as the network cable is precisely matched. The light transmission test showed that the battery had a transparency of 62% in visible light; the three cells were laminated together with a transparency of 60%, and the entire battery was very soft. More importantly, the cost is the same as for a regular battery.
Yang Yuan said: "The limitation of ** is that the energy density of this transparent battery is lower than that of ordinary lithium batteries, which is similar to that of nickel-cadmium batteries." Most laptops and mobile phones are powered by lithium batteries; nickel-cadmium batteries are mainly used for Digital cameras and other devices with lower energy density. However, the energy density of the transparent battery can be continuously improved by improving the material properties.
Cui Yi has applied for a patent for the battery and is optimistic that transparent batteries are very important for basic research; we also hope to cooperate with Apple to enable people to have transparent Apple phones in the future.
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