"Charging 5 minutes, talking for 2 hours", this familiar slogan points out people's urgent need for fast charging and even second rechargeable batteries.
Recently, Prof. Zhu Meifang-Professor Liao Yaozu of the State Key Laboratory for Modification of Fiber Materials of Donghua University and Professor Arne Thomas of the Technical University of Berlin, Germany, have created new electrode materials in an innovative way to enable rapid charge and discharge. Large-energy supercapacitors have become possible, and relevant research results have been published in the internationally renowned academic journal Advanced Materials 2018, 30, 1705710 (Latest Impact Factor 19.791). Donghua University is the first completing unit of the dissertation. Professor Liao Yaozu is the first author and coauthor of communication with Professor Anatom Thomas.
("Advanced Materials" official website published a research paper)
Experts once predicted that global energy mineral resources are only enough to support less than 100 years. China’s oil can only support domestic consumption for 30 years, coal can support up to 100 years, and existing energy structures based on fossil fuels lead to serious global challenges. In the energy crisis, there is an urgent need to find alternative energy storage and conversion methods.
As a new type of green energy storage method, supercapacitors have the advantages of faster charging and discharging speed, green pollution-free, high energy density, and good cycle stability compared with traditional batteries. Once they are available, they have attracted widespread attention.
Professor Liao Yaozu said that the key to improving the overall performance of supercapacitors lies in finding suitable electrode materials. The energy storage mechanism of supercapacitors is divided into two types of electric layers and tantalum capacitors. The corresponding electrode materials are carbon materials and conducting polymers. . “General conductive polymers are linear, and they are prone to expansion and decomposition during high-current transmission. While porous carbon materials have good stability and limited electric energy storage, what we do is to develop high specific capacitance, high ratio, and high cycling. The stable electrode material maximizes the two types of energy storage mechanisms."
(Aminoanthraquinone Porous Conjugated Polymer Design and Supercapacitor Assembly)
After repeated experiments, the research team proposed the Buchwald-Hartwig cross-coupling method to prepare a porous conjugated amino-fluorene conjugated polymer containing nitrogen in the main chain and containing oxygen in the side group (with N and O contents as high as 20%). The chemical weaving method was used to design the porous conjugated polymer. The molecular network structure of the polymer, thereby optimizing the redox activity of the material, increasing the storage capacity of the electrode while ensuring rapid charge and discharge, and utilizing the pore structure of the porous conjugated polymer skeleton to promote the transmission of the electrolyte, avoiding The swelling and shrinkage of the electrode material. The experimental results show that the developed three-electrode supercapacitor has a specific capacitance of 576F/g at a low current density of 1 A/g, and the specific capacitance at a high current density of 10 A/g still maintains 410 F/g, and it can still maintain 85 after 6,000 cycles. The % initial capacitance shows excellent rate and cycling performance; the resulting assembly is asymmetrical, double electrode supercapacitor with a wide operating window, power and energy densities of up to 1300 W/kg and 60 Wh/kg, respectively, and no degradation during 2000 cycles.
It is reported that this research provides new ideas for the rational design of organic porous materials for electrochemical energy storage. With the continuous development and improvement of electrode material properties, super capacitors that feature green, fast charging, and high-efficiency recyclable features will become the “sunshine†of the energy market in the future, and supercapacitors will also enter the ordinary people from the laboratory. Home, in the new energy vehicles, household appliances, smart wearable devices, aerospace, rail transportation and military and other fields have great potential for development and application prospects.
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