Supercapacitors can charge and discharge faster than conventional batteries, but they cannot store large amounts of power. A team of scientists from Drexel University applied the conductive polymer nanocomposite MXene (two-dimensional transition metal carbide or carbonitride) developed by the University of Drexel to develop a new electrode material and a chemical battery prepared therefrom With both the high-speed charge and discharge speeds of supercapacitors and the high energy storage capacity of conventional batteries, this new electrode can be used to manufacture electronic devices that can be quickly charged in seconds.
The anxiety of waiting for the device to be fully charged must have been experienced by everyone. The conductive polymer nanocomposite MXene can greatly improve the electrode conductivity, the high specific surface area improves the electrical storage performance, and the flexible supercapacitor provides longer charging times and longer life. Professor Yury Gogotsi, leader of the Dreser team, stated that "This paper refutes the general concept that the generally accepted process of chemical charging of batteries and quasi-capacitors is always slower than the physical charging of supercapacitors (double-layer capacitors). Electrodes using MXene materials can be quickly charged in tens of milliseconds. This eliminates the obstacles to the R&D path for developing ultra-fast energy storage devices that can charge and discharge rapidly in seconds, while storing much more energy than conventional supercapacitors."
The structure of this novel material determines its excellent characteristics. Its chemical formula can be represented by Mn+1XnTz, in which M refers to a transition metal (such as Ti, Zr, Hf, V, Nb, Ta, Cr, Sc, etc.), X By C or/and N, n is typically 1-3, and Tz refers to surface groups (such as O2-, OH-, F-, NH3, NH4+, etc.). At present, MXenes are mainly obtained by extracting weakly A-site elements (such as Al atoms) in the MAX phase from HF acid or a mixed solution of hydrochloric acid and fluoride. It has the characteristics of high specific surface area and high electrical conductivity of graphene. It also has the advantages of flexible and adjustable components and minimal nano-layer thickness control. It has shown great potential in energy storage, adsorption, sensors, conductive fillers and other fields. .
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