Views: 0 Author: Site Editor Publish Time: 2021-03-11 Origin: Site
There is an academic paper on the LETTER page of the world's earliest international scientific and technological journal "NATURE", called “An ultrafast rechargeable aluminium-ion battery”. In the academic paper, Dasen’s pyrolytic graphite sheet was used to make the electrochemical measurements.
A Swagelok-type cell (1/2 inch diameter) was constructed using a 4mg PG foil (0.017mm, Suzhou Dasen Electronics Materials) cathode and a 90mg Al foil (0.25mm, Alfa Aesar) anode.
The development of new rechargeable battery systems could fuel various energy applications, from personal electronics to grid storage1,2. Rechargeable aluminium-based batteries offer the possibilities of low cost and low flammability, together with three-electron-redox properties leading to high capacity3. However, research efforts over the past 30 years have encountered numerous problems, such as cathode material disintegration4, low cell discharge voltage (about 0.55 volts; ref. 5), capacitive behaviour without discharge voltage plateaus (1.1–0.2 volts6or 1.8–0.8 volts7) and insufficient cycle life(less than 100 cycles) with rapid capacity decay (by 26–85 per cent over 100 cycles)4-7. Here we present a rechargeable aluminium battery with high-rate capability that uses an aluminium metal anode and a three-dimensional graphitic-foam cathode. The battery operates through the electrochemical deposition and dissolution of aluminium at the anode, and intercalation/de-intercalation of chloroaluminate anions in the graphite, using a non-flammable ionic liquid electrolyte. The cell exhibits well-defined discharge voltage plateaus near 2 volts, a specific capacity of about 70mAh g–1 and a Coulombic efficiency of approximately 98 percent. The cathode was found to enable fast anion diffusion and intercalation, affording charging times of around one minute with a current density of 4,000mAg–1 (equivalent to 3,000Wkg–1),and to withstand more than 7,500 cycles without capacity decay.
Owing to the low-cost, low-flammability and three-electron redoxproperties of aluminium (Al), rechargeable Al-based batteries could in principle offer cost-effectiveness, high capacity and safety,whichwould lead to a substantial advance in energy storage technology3,8. Howeverresearch into rechargeable Al batteries over the past 30 years has failed to compete with research in other battery systems. This has been due to problems such as cathode material disintegration4, low cell discharge voltage (~ 0.55V; ref. 5), capacitive behaviour without discharge voltage plateaus (1.1–0.2 V, or 1.8–0.8 V; refs 6 and 7, respectively), and insufficient cycle life (<100 cycles) with rapid capacity decay (by 26–85% over 100 cycles) 4–7. Here we report novel graphitic cathode materials that afford unprecedented discharge voltage profiles, cycling stabilitiesand rate capabilities for Al batteries.