[ Instrument R & D of Instrument Network ] Recently, Tang Yongbing, a researcher of the Functional Thin Film Materials Research Center of the Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, and his team members successfully developed a high-rate, long-cycle potassium-based dual ion battery based on organic negative electrodes.
The working principle of the dual ion battery is also different from the traditional lithium ion battery. During the charging process, the anion intercalation reaction occurs on the positive graphite, and the aluminum-lithium alloying reaction occurs on the aluminum negative electrode, and the discharge process is the opposite. This new reaction mechanism not only significantly improves the battery's operating voltage (3.8-4.6V), but also greatly reduces the battery's quality, volume, and manufacturing costs, thereby comprehensively increasing the battery's energy density, thereby improving battery life.
Potassium-based dual-ion batteries (K-DIBs) have good application prospects in the field of large-scale energy storage due to their advantages of low cost and environmental protection. However, due to the large K + ion radius and the problem of co-insertion with solvent molecules, the use of traditional graphite-based materials as the negative electrode is likely to cause slow battery kinetics, and the graphite-based negative electrode is prone to peeling during charge and discharge.
Potassium ions have no oxidizing property in solution, and show extremely weak oxidizing property in the molten state, and generally do not react with other ions. However, perchlorate ions can be combined with potassium ions to form a slightly soluble potassium perchlorate precipitate. Other potassium ion precipitates include potassium hydrogen tartrate, potassium hexachloroplatinate, potassium fluorozirconate, sodium potassium cobalt nitrite, and potassium tetraphenylborate. The flame reaction of potassium ions is purple, which needs to be seen through blue cobalt glass (to prevent interference from Na +). Potassium ions are colorless in solution.
In view of this, Tang Yongbing and team members Yu Ao, Pan Qingguang, Zhang Miao and others investigated the potential application of a variety of organic materials as K-DIBs anodes, intending to realize the dual ion through the flexible structure of organic materials and the advantages of a large number of active sites Significant improvement in battery performance. In addition, in order to improve the ion diffusion channel and shorten its diffusion path, the team successfully prepared a 3D porous K2TP organic negative electrode material (pK2TP) using a freeze-drying method, which significantly improved its kinetic performance. The team further combined a porous organic negative electrode with good dynamics with a low-cost, environmentally friendly expanded graphite (EG) positive electrode, and successfully constructed a new type of potassium-based dual ion battery (pK2TP // EG). The research results show that the new potassium-based dual ion battery has excellent rate performance (20 C) and long cycle life, and the capacity retention rate after 2000 cycles is ~ 100%. This research expands the choice of potassium ion anode materials and provides new ideas for the development of new energy storage devices.
Source: Encyclopedia, Shenzhen Advanced Technology Research Institute
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