Development of long lifespan high-energy aqueous organic||iodine rechargeable batteries.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 36310178.
- Also identified by DOI 10.1038/s41467-022-34303-8 and PMC identifier 9618581.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Rechargeable aqueous metal||I<sub>2</sub> electrochemical energy storage systems are a cost-effective alternative to conventional transition-metal-based batteries for grid energy storage. However, the growth of unfavorable metallic deposition and the irreversible formation of electrochemically inactive by-products at the negative electrode during cycling hinder their development. To circumvent these drawbacks, herein we propose 3,4,9,10-perylenetetracarboxylic diimide (PTCDI) as negative electrode active material and a saturated mixed KCl/I<sub>2</sub> aqueous electrolyte solution. The use of these components allows for exploiting two sequential reversible electrochemical reactions in a single cell. Indeed, when they are tested in combination with an active carbon-enveloped I<sub>2</sub> electrode in a glass cell configuration, we report an initial specific discharge capacity of 900 mAh g<sup>-1</sup> (electrode mass of iodine only) and an average cell discharge voltage of 1.25 V at 40 A g<sup>-1</sup> and 25[Formula: see text]1 °C. Finally, we also report the assembly and testing of a PTCDI|KCl-I<sub>2</sub>|carbon paper multilayer pouch cell prototype with a discharge capacity retention of about 70% after 900 cycles at 80 mA and 25[Formula: see text]1 °C.