On the 6th, the reporter learned from the Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences that researchers from the institute and other units have successfully developed a new magnesium-based dual ion battery (Mg-DIB) based on insoluble organic negative electrode materials. Relevant research results were published in the international top energy materials journal "Energy Storage Materials".
In recent years, lithium-ion batteries have been widely used in consumer electronics, new energy vehicles, and energy storage. However, lithium resource reserves are limited and unevenly distributed, making it difficult to meet the low-cost requirements of future society for large-scale energy storage. Magnesium ion batteries have good application prospects in the field of large-scale energy storage due to their advantages of high capacity and abundant reserves. "However, metal magnesium anodes are prone to passivation in organic electrolytes, resulting in magnesium ions that cannot be reversibly deposited / dissolved. In addition, there is still a lack of cathode materials that reversibly deintercalate magnesium ions, which restricts the development of magnesium electricity." 1. Tang Yongbing, a researcher at the Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, said.
Compared with traditional inorganic electrode materials, organic electrode materials show a very potential magnesium storage capacity due to the mild redox reaction between their functional groups and ions. At the same time, if the working mechanism of the dual ion battery can be combined, the high reaction potential of the anion intercalated graphite cathode and the rapid anion diffusion kinetics will greatly improve the working voltage and electrochemical performance of the magnesium ion battery.
In view of this, the researchers developed a new type of magnesium-based dual ion battery, which uses 3,4,9,10-perylenetetracarboxylic acid diimide (PTCDI) small molecule organic material as the negative electrode, and expanded graphite as the positive electrode , Ionic liquid containing magnesium salt as electrolyte. The results show that the magnesium-based dual-ion battery has excellent rate performance and cycle performance. The high rate charge-discharge capacity retention rate at 20C is 85%, and the capacity retention rate after 500 cycles at 5C rate is 95.7%. Tang Yongbing said that the work broadened the choice of electrode materials for magnesium ion batteries and provided new ideas for the development of new energy storage devices. (Reporter Lu Chengkuan)
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