The Case Western Reserve University (Case Western Reserve University; CWRU) researchers have developed a soft line of miniature super capacitor (microsupercapacitor), can be woven into the jacket, shirt or dress, to create tailor-made wearable electronic devices power supply.
By design or by series/parallel connection capacitor and the components can be moulded to become tie-in wearable device needed to charge storage and transmission.
Although like portable camera, intelligent glasses, health monitoring sensors and activity tracker wearable electronic products continue to progress, but still faces a challenge - you can only offer little and charging power source of trouble.
Linear miniature super capacitor without bending, can be woven into the white fabric
"Clothing size is fixed, therefore, in order to generate the required power density in smaller area, we grow in as the main electrode titanium online radial calibration of titanium oxide nanotubes," at case western reserve university high polymer science and engineering at Kent Hale Dai Liming professor Smith said, "by increasing the surface area of the electrode, can increase the capacitance value."
Dai Liming and molecular science and engineering at case western reserve university postdoctoral researcher Tao Chen, in the latest issue of the Energy Storage Materials (Energy Storage Materials) journals published their research in miniature super capacitor.
Capacitance and the battery is the same stuff of energy storage component, but provides the advantages of faster charging and discharging capacitance.
In the new development of super capacitor in titanium adjusted online by polyvinyl alcohol and phosphate made of solid electrolyte coating, reoccupy yarn or neat rows of carbon nanotubes film coated titanium wire, a second electrode. Titanium oxide nanotubes is a kind of semiconductor, but two electrodes separated to two active parts of the area, so as to avoid short-circuit.
In testing, when the carbon nanometer line yarn thread increased from 1 to 2 to 3, the capacitance of each micron (mm) of the storage capacity and q (mf) increased from 0.57 mm to 0.57 mf, then increases to 1.04 mf.
When thin layer coated with carbon nanotubes, increase the effective area of the electrode, making the super capacitor storing 1.84 microns per mf power. The energy density of about 0.16 x 10 per cubic centimeter - 3 mW, and the power density of about 0.01 mW per cubic centimeter.
Whether or not covered yarn or thin layer, miniature super capacitor after 1000 times charging and discharging cycle, can still retain at least 80% of the capacitance. Researchers say that in order to match the wearable devices of various special power demand, the linear capacitor can improve the voltage or current in the form of series or parallel.
When after hundreds of times of 180 degree bends, the capacitor can still show no loss of performance. And with the method of thin layer coating can show more high mechanical strength.
Dai Liming said, "this miniature super capacitor is very soft, so can integrate in fabric or textile materials, provide a wearable device with wearable soft power, but also can be used for the power supply of biological sensors and other biomedical devices, especially suitable for the application of the body."
Now, researchers are to proceed to the linear capacitance woven into the fabric, and further make the integration and wearable devices.
