Structure and Reaction Mechanism of New Type Zinc Ion Hybrid Supercapacitor
Recently, Tang Yongbing, a researcher at the Functional Film Research Center of the Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, successfully developed a new type of zinc ion hybrid supercapacitor. This work has important implications for the study of novel energy storage devices based on polyvalent carriers.
In order to alleviate the shortage of resources and environmental pollution caused by the massive use of fossil energy, various countries are accelerating the use of renewable energy such as solar energy, wind energy, water conservancy, and tidal energy. However, renewable energy sources have very obvious intermittent characteristics and require low-cost development. , Efficient energy storage technology and its cooperation. Currently widely used lithium-ion battery is an excellent electrochemical energy storage technology, but the reserves of lithium resources is very limited, and the distribution is extremely uneven, resulting in high cost of lithium-ion batteries, And the recovery is difficult, which limits its wide application in the field of large-scale energy storage. The development of a new type of electrochemical energy storage device based on low cost, easy recovery has important research value and application prospects.
Based on this, members of the Tang Yongbing team, Wang Heng and Wang Meng, developed a new type of high-efficiency, low-cost hybrid supercapacitor based on +2 zinc ions as active carriers. The device integrates low-cost zinc foil design. As the negative electrode active material and current collector, the environmentally-friendly biomass activated carbon is used as the positive electrode, and the organic solvent containing the zinc salt is used as the electrolyte. The reduction/oxidation reaction of the zinc ion at the negative electrode and the adsorption/desorption reaction of the anion at the positive electrode are realized. The reversible charging and discharging of the capacitor. The zinc is rich in reserves, and the ion is +2. It can make the zinc ion-based hybrid supercapacitor obtain high energy density, while maintaining the advantages of low cost and easy recovery. After system optimization, the zinc Ion-mixed supercapacitors achieve excellent electrochemical performance: At a power density of 1725 W/kg, the energy density is higher than 52 Wh/kg; and after 22,000 cycles, the capacity retention rate is higher than 91%. Scale in the field of renewable clean energy The energy storage has a good application prospect.
The related research results are based on the A Novel Zinc-Ion Hybrid Supercapacitor for Long-Life and Low-Cost Energy Storage Applications and are published in the Energy Storage Materials Journal. This research was supported by the National Natural Science Foundation of China, Guangdong Province Science and Technology. Planning project, Shenzhen Science and Technology Plan project, etc.
