With the rapid development of portable electronic products and electric vehicles, modern society is in urgent need of high-performance energy storage equipment with high safety, long service life and rapid charging and discharging; However, the existing energy storage system often has some defects, such as Farad capacitor Low energy density, safety risk of lithium ion battery, poor cycle stability of alkaline zinc manganese dioxide battery.

Recently, Professor Kang Feiyu and Associate Researcher Xu Chengjun from Shenzhen Graduate School of Tsinghua University reported a new type of zinc ion hybrid supercapacitors (ZHSs). The paper was published in the journal Energy Storage Materials with the title of Extremely safe, high rate and ultra life zinc ion hybrid supercapacitors With metal zinc as negative electrode and neutral aqueous solution of zinc sulfate as electrolyte, the reversible energy storage/release was realized by means of rapid adsorption and desorption of ions on the surface of activated carbon and dissolution/deposition of zinc ions on the surface of zinc electrode.

The super capacitor skill is still in its infancy and has high development potential, compared with the chemical battery constrained by the fixed structure of the battery Super capacitor manufacturer Energy storage mainly depends on the physical function of materials. At the same time, compared with other mainstream batteries, Farad capacitors still do not make full use of the potential of surface energy storage, and there is no disjointed "workshop" type production form and lack of raw material supply.

Specifically, within the operating voltage range of 0.2~1.8 V, the specific capacity and energy density of the zinc ion hybrid supercapacitor can reach 121 mAh/g and 84 Wh/kg (based on the mass of activated carbon electrode) respectively, and can be charged and discharged quickly within 15 seconds, with a power density of 14.9 kW/kg and an energy density of 30 Wh/kg. In contrast, symmetrical supercapacitors with activated carbon as electrode only obtain energy density of 0.5~3.3 Wh/kg in sulfuric acid, sodium sulfate, zinc sulfate and other aqueous electrolytes. In addition, the zinc ion hybrid supercapacitor shows excellent cycle stability. After 10000 charge discharge cycles at 1 A/g current density, the capacity retention rate is up to 91%. Furthermore, the relationship between the electrochemical properties of different carbon positive electrodes and zinc ion hybrid supercapacitors, and the influence of different electrolytes (especially alkaline and neutral electrolytes) on the cycle stability of zinc negative electrodes and the whole device were discussed. The energy storage mechanism of the zinc ion hybrid supercapacitor was discussed in detail based on the analysis of electrode micro morphology and composition characterization. It was shown that the physical adsorption and desorption of ions on the surface of activated carbon and the deposition/dissolution of zinc ions on the zinc electrode were the core mechanisms, but accompanied by the formation of basic zinc sulfate.

One of the ingenious points of the construction of the zinc ion hybrid supercapacitor is that the repeated dissolution deposition process of the metal zinc electrode in the zinc sulfate aqueous electrolyte system can output high specific capacity while having excellent cycle stability and safety; The research of this new safe water system zinc ion hybrid supercapacitor, which can charge and discharge quickly and has an ultra long life, provides a new choice for the next generation of energy storage devices.

Super capacitor module The extension of longevity of over capacity is relatively speaking, a process of continuous influence, not a function of extending longevity after a short time of operation. The influencing factors of longevity of over capacity can be divided into two parts: first, the production process and process requirements, the control of moisture and magazine content, the formula of polar slice, feeding, etc; 2、 Super capacitor after production, application environment and cycle depth.