In order to alleviate the shortage of resources and environmental pollution caused by the large-scale use of fossil energy, countries are accelerating the use of renewable energy such as solar energy, wind energy, water conservancy and tidal energy. However, renewable energy has very obvious intermittent characteristics, and it is necessary to develop low-cost and high-efficiency energy storage technologies. Currently widely used lithium-ion batteries are an excellent electrochemical energy storage technology, but the reserves of lithium resources are very limited, and the distribution is extremely uneven, resulting in high cost of lithium-ion batteries, and difficulty in recycling, limiting its large-scale Wide application in the field of energy storage. The development of new electrochemical energy storage devices based on low cost and easy recycling has important research value and application prospects.
Accordingly, Tangyong Bing team member Wang Heng, Wang Meng, who developed a zinc-based +2 ions as active carriers of new and efficient low-cost hybrid supercapacitor. The device of inexpensive zinc foil integrated design, while it as a negative electrode active material and a current collector to activated carbon as the positive electrode green biomass, organic solvent soluble zinc salt as electrolyte, the negative electrode by zinc ions The reduction / oxidation reaction and the adsorption / desorption reaction of the anion on the positive electrode achieve reversible charge and discharge of the capacitor. Zinc is rich in reserves, and the ion is +2 valence, which enables the zinc ion-based hybrid supercapacitor to obtain high energy density while maintaining the advantages of low cost and easy recycling. After the system is optimized, the zinc ion hybrid supercapacitor obtained excellent electrochemical performance: 1725W kg at a power density, and energy density higher than / 52Wh / kg; and after 22 000 cycles, the capacity retention rate at 91%. Large-scale energy storage in the field of renewable clean energy has a good application prospect.
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