The latest electrode material modification method to improve the supercapacitor capacity
Power density, charge and discharge time is short, long cycle life ... Speaking of many advantages of supercapacitors, but currently on the market of commercial supercapacitors generally low capacity, affecting the widespread use of supercapacitors. Nanjing University of Technology found a method of electrode material modification, will greatly increase the capacity of the capacitor. The results have been published in the latest issue of the international authority of the "advanced materials".
As a new type of high-efficiency energy storage device, supercapacitors can be recharged in just tens of seconds and have hundreds of thousands of lifetimes. At present, the commercial use of supercapacitors on the market mostly uses activated carbon material electrodes, and the energy storage rate is limited. The capacity of high-end supercapacitors on the market is only 1/12 of that of lithium batteries, which limits the application of supercapacitors. The metal oxide electrode material will have a high 3 to 4 times the theoretical capacity, but due to poor electron and ion transport properties, the practical application of capacity is difficult to achieve the theoretical height.
Prof. Xia Hui, a researcher at Glite Nanotechnology Institute of Nanjing University of Science and Technology, has been trying to solve the capacity bottleneck through material modification, that is, introducing or taking out some atoms or groups in the chemical structure of energy materials to improve the poor electricity of the material itself Chemical characteristics.
In an attempt to synthesize metal phosphides, the group accidentally discovered an interesting modification: a phosphate ion can surface a wide range of metal oxide (eg, tricobalt oxide, iron oxide, and nickel oxide) electrode materials modified.
By adjusting the surrounding electronic environment of the metal ions on the surface of the electrode and the porous ultra-thin nanosheet morphology, the phosphate ion facilitates the ion transport and improves the efficiency of the redox reaction so as to improve the capacity of the ultracapacitor. This research will open a new opportunity for the wide application of supercapacitors.
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