my country develops high-performance calcium ion batteries

　　Recently, Tang Yongbing, a researcher at the Functional Thin Film Materials Research Center of the Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, and his team joined forces with Cheng Huiming, a researcher at the Shenyang National Research Center for Materials Science, Tsinghua-Berkeley, Shenzhen College and Institute of Metal Research, to develop a high-performance calcium ion. Battery.

　　Recently, Tang Yongbing, a researcher at the Functional Thin Film Materials Research Center of the Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, and his team joined forces with Cheng Huiming, a researcher at the Shenyang National Research Center for Materials Science, Tsinghua-Berkeley, Shenzhen College and Institute of Metal Research, to develop a high-performance calcium ion. Battery. Through the innovation of the battery structure, the calcium ion battery has a new electrochemical reaction mechanism and realized a stable charge and discharge reaction at room temperature. Related research results were published online in "Nature-Chemistry".

　　Among the alkaline earth metal elements, calcium has the advantages of low polarization, standard electrode potential close to lithium, +2 valence (the number of charged ions is twice that of lithium ions), abundant reserves, and low cost. Therefore, calcium ion batteries have the potential to become high-efficiency and low-cost energy storage batteries.

　　Researchers have proposed a new type of calcium ion battery, which uses tin foil as the negative electrode to undergo reversible alloying reaction with calcium ions, and at the same time uses an integrated design of active material and current collector; graphite as the positive electrode to achieve reversible intercalation/deintercalation of anions Reaction: A carbonate solvent with calcium hexafluorophosphate and 5V high pressure resistance is used as the electrolyte. The calcium ion battery has excellent electrochemical performance, the average discharge medium voltage is as high as 4.45V, and the capacity retention rate after 350 cycles at room temperature is greater than 95%.