Recently, Tang Yongbing, a researcher of the Functional Thin Film Materials Research Center of the Institute of Advanced Technology, 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. Related research results "Fast Rate and Long Life Potassium-Ion Based Dual-ion Battery through 3D Porous Organic Negative Electrode" were published online in the international journal "Advanced Functional Materials" (Advanced Functional Materials, DOI: 10.1002 / adfm.202001440).
Potassium-based dual-ion batteries (K-DIBs) have good application prospects in the field of large-scale energy storage due to their 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.
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.
The research was supported by the National Natural Science Foundation of China, the Guangdong Science and Technology Plan, and the Shenzhen Science and Technology Plan.
Schematic diagram of preparation of porous organic K2TP anode (a), scanning electron micrograph of porous organic anode (b), AFM characterization (c) and FT-IR spectrum (d); long cycle curve of K-DIBs based on porous organic anode (e )
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