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 research team successfully developed a calcium-type dual-ion battery based on a dual-carbon structure. Related research results A Novel Calcium-Ion Battery Based on Dual-Carbon Configuration with High Working Voltage and Long-Cycling Life have been published online in the international materials science journal Advanced Science (Advance Science, 2018, DOI: 10.1002 / advs.201701082).
Since the successful commercialization of lithium-ion batteries in 1991, they have been widely used in various electronic devices, new energy vehicles, and energy storage. However, due to the limited and uneven distribution of lithium resources and the difficulty in recycling lithium-ion batteries, the cost of lithium-ion batteries is gradually increasing, and it is difficult to meet the future society's requirements for low-cost and environmentally friendly and easy-to-recycle for large-scale energy storage. Compared to lithium ions, calcium has similar physical and chemical properties and abundant reserves. In addition, calcium ions carry two charges, and the standard hydrogen electrode potential is -2.868V, which is close to lithium, making calcium ion batteries promising to be the next generation of new and highly efficient and environmentally friendly energy storage devices. However, in the traditional organic electrolyte, the surface of metal calcium is prone to passivation, resulting in calcium ions cannot be reversibly deposited like lithium ions, and the development of calcium ion battery materials is difficult. Most calcium ion batteries can only be reversible charge and discharge at high temperatures, resulting in The development of calcium ion batteries is slow.
In view of this, Tang Yongbing and his team members Wu Shi, Zhang Fan and others successfully developed a calcium-type dual-ion battery based on a double-carbon structure. The battery material is cheap and easy to obtain and is environmentally friendly. It uses expanded graphite as the positive electrode material, PF6-anion can be reversibly inserted / extracted in its sheet structure; mesophase carbon microspheres are used as the negative electrode material, and Ca2 + can be in its sheet structure Reversible insertion / extraction. The electrolyte uses a carbonate-based electrolyte based on calcium hexafluorophosphate as the electrolyte. Studies have shown that the calcium-type dual-ion battery can achieve reversible charge and discharge at room temperature, and shows excellent electrochemical performance: the average operating voltage is as high as 4.6V, the capacity retention rate after cycling 300 cycles at 1C rate is 94%. This new type of calcium ion battery structural design has opened up new ideas for the research of calcium ion batteries, and also provided reference for research based on multivalent metal ion batteries.
The research was supported by the National Natural Science Foundation of China, the Guangdong Science and Technology Plan Project, and the Shenzhen Science and Technology Plan Project.
(a) Schematic diagram of the charge-discharge mechanism of a calcium-type dual-ion battery based on a double-carbon structure; (b) charge-discharge curve; (c) dQ / dV curve.
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