'Recharge 5 minutes, 2 hours' call, this familiar slogan points out people's urgent need for fast charging, even second rechargeable batteries.
Recently, Prof. Zhu Meifang-Professor Liao Yaozu of the State Key Laboratory of Modification of Fiber Materials of Donghua University and Professor Arne Thomas of the Technical University of Berlin, Germany, used the innovative method to prepare novel electrode materials, enabling rapid charge and discharge Large-energy supercapacitors have become possible. The relevant research results were 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 this paper. Prof. Liao Yaozu is the first author and co-author with Prof. Ana Thomas.
("Advanced Materials" official website published research papers)
Experts had predicted that the 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 the existing energy structure based on fossil fuels leads 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, higher energy density, and better cycle stability than conventional batteries. Once they come out, they have attracted widespread attention.
Professor Liao Yaozu said that to improve the overall performance of supercapacitors, the key 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. 'The general conductive polymer is linear, and it easily expands and decomposes during high-current transmission. While the porous carbon material has good stability but limited electric energy storage, what we do is to develop high specific capacitance, high magnification and high The cyclic stability of the electrode material maximizes the use of two 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 amino hydrazine porous conjugated polymers containing nitrogen in the main chain and oxygen in the side groups (N, O content as high as 20%), and designed them in a 'chemical weaving' manner. This polymer molecular network structure optimizes the redox activity of the material, ensures rapid charge and discharge while improving the electrode's stored charge, and utilizes the pore structure of the porous conjugated polymer skeleton to promote electrolyte transport. Swelling and contraction 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 is maintained at 410 F/g at a high current density of 10 A/g. After 6,000 times, 85% of the initial capacitance can still be maintained, exhibiting excellent rate and cycle performance; and further, the operating window of the asymmetrical two-electrode supercapacitor is assembled to have a wide operating window with power and energy density as high as 1300 W/kg and 60 Wh/kg, respectively. 2000 performance without attenuation.
It is reported that this research work provides a new idea for the rational design of organic porous material for electrochemical energy storage. With the continuous development and improvement of electrode material properties, the company will be green, environmentally friendly, and ultracapacitors with fast-charging and high-efficiency recyclable features will become the future. In the energy market, the “Songs”, ultracapacitors will also enter the homes of ordinary people from the laboratory. They have great development in the fields of new energy vehicles, household appliances, smart wearable devices, aerospace, rail transit, and military. Potential and application prospects.
