"Charging for 5 minutes, talking for 2 hours", this doll can also blurt out the slogan, hit the pain point of lithium battery charging and discharging speed is slow. The reporter learned from Nanjing University of Science and Technology on the 14th that the school's nano-energy materials laboratory team uses new materials to make supercapacitors that have both large storage capacity and fast charge and discharge advantages. Related results were published in the latest issue of "Advanced Materials".
As an energy storage device, supercapacitors have the outstanding advantage of being able to charge and discharge quickly. However, most of the popular electronic products on the market still use lithium batteries with relatively slower charge and discharge speeds. This is because of the shortcomings of low energy storage. It severely limits the application of supercapacitors.
Electrode and electrolyte are two major factors that affect the performance of supercapacitors. For a long time, scientific researchers have tried to find a method that can maintain the advantages of rapid charge and discharge and improve the storage capacity from the above two perspectives.
According to Professor Xia Hui, the team leader, iron oxide is rich in resources, low in price, and environmentally friendly. As an electrode material with great application potential, it is favored by many researchers, but its poor electronic and ion conductivity performance restricts Its application in supercapacitors. The team proposed for the first time that the modified method was used to create oxygen defects on the surface of the iron oxide electrode material, thereby effectively regulating the interaction between the modified iron oxide electrode material and the redox electrolyte to ensure fast charge and discharge performance while improving The electrode can store electricity.
The experimental calculation results show that the charging and discharging speed of this system can reach 3.2V per second, and the existing similar supercapacitors are only 0.4V per second; and under this condition, the stored power can reach 290C / g, compared with the current 60-100C / g with super capacitors has a significant improvement.
The research results provide new ideas for the research and development of water-based supercapacitors, and are expected to make up for many of the deficiencies of the existing organic supercapacitors on the market, and the storage capacity is 5-10 times the latter.
Xia Hui said that high-efficiency energy storage devices represented by supercapacitors are an indispensable part in the vigorous development of clean energy. At present, the laboratory is being applied to industrialization, and follow-up research is being carried out along the direction of further improving the electricity storage and working voltage.
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