Recently, the team of Tang Yongbing, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, has developed a magnesium-based dual-ion battery based on insoluble organic negative electrode materials. Related results were published in "Energy Storage Materials". The project is expected to provide new ideas for the development of new magnesium ion battery electrode materials and devices. "Magnesium ion batteries have the advantages of high capacity, abundant reserves, and low cost, and have good application prospects in the field of energy storage in the future." Team member Zhang Fan told the China Science Journal. However, as a good energy storage material, how to apply it to batteries is a difficult problem. On the one hand, the traditional organic carbonate-based electrolyte will passivate with the magnesium anode, resulting in a dense oxide film, which will hinder the passage of magnesium ions and ultimately lead to irreversible deposition / dissolution of magnesium ions. On the other hand, unlike lithium ions, which can be easily transported between the positive and negative electrode materials, magnesium ions are slow to enter the structure of the positive electrode material due to the large charge, and the combination of magnesium and the positive electrode material is stronger. When it comes out, it may cause the cathode material to collapse, making the reversible charge and discharge performance of magnesium ion batteries poor. "Can't get out" on the positive electrode material, "can't get in" on the negative electrode material, how to solve the "pass" of magnesium ions, so that the magnesium ions can really work, achieve low cost and have good charge and discharge effects? The research team decided to use a dual ion reaction to solve the magnesium ion problem. The research team changed the traditional research ideas, adjusted the positive and negative materials, and developed a new type of magnesium-based dual-ion battery. The researchers used an ionic liquid containing magnesium salts as the electrolyte. At the positive end, expanded graphite was used as the positive electrode material. At the negative end, they decided to use a small organic molecule that is insoluble in the electrolyte and has good magnesium storage properties as the negative electrode. Materials, which changes the tradition that electrode materials mostly appear as inorganic materials. The working mechanism of this magnesium-based dual-ion battery is as follows: when charging, the anions in the electrolyte intercalate with graphite in the positive electrode material, and at the negative end, the magnesium ions in the electrolyte are stored in organic small molecule materials Medium; the opposite is true during discharge, and the anions and cations in the electrode material return to the electrolyte again. By combining the working principle of the dual ion reaction, the problem of slow and irreversible reaction of traditional magnesium ions in the cathode material is well solved, and the output voltage of the magnesium ion battery is also improved. The research results show that this magnesium-based dual-ion battery has excellent rate performance and cycle performance, high rate charge and discharge capacity retention rate is 85%, and the capacity retention rate after cycling 500 times at 5C rate is 95.7%. This achievement has broadened the choice of electrode materials for new magnesium ion batteries. The team will continue to combine the dual ion working mechanism in the future to develop new batteries based on different cheap metal elements, providing new ideas for the development of new high-performance low-cost energy storage devices. (Apprentice reporter Diao Wenhui) Processed Parts,Processed Machined Parts,Processing Nylon Parts,Processing Custom Parts Mianyang Prochema Commercial Co.,Ltd. , https://www.gustek.com