Binuclear Cu complex catalysis enabling Li-CO<sub>2</sub> battery with a high discharge voltage above 3.0 V.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 36725869.
- Also identified by DOI 10.1038/s41467-023-36276-8 and PMC identifier 9892515.
- 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
Li-CO<sub>2</sub> batteries possess exceptional advantages in using greenhouse gases to provide electrical energy. However, these batteries following Li<sub>2</sub>CO<sub>3</sub>-product route usually deliver low output voltage (<2.5 V) and energy efficiency. Besides, Li<sub>2</sub>CO<sub>3</sub>-related parasitic reactions can further degrade battery performance. Herein, we introduce a soluble binuclear copper(I) complex as the liquid catalyst to achieve Li<sub>2</sub>C<sub>2</sub>O<sub>4</sub> products in Li-CO<sub>2</sub> batteries. The Li-CO<sub>2</sub> battery using the copper(I) complex exhibits a high electromotive voltage up to 3.38 V, an increased output voltage of 3.04 V, and an enlarged discharge capacity of 5846 mAh g<sup>-1</sup>. And it shows robust cyclability over 400 cycles with additional help of Ru catalyst. We reveal that the copper(I) complex can easily capture CO<sub>2</sub> to form a bridged Cu(II)-oxalate adduct. Subsequently reduction of the adduct occurs during discharge. This work innovatively increases the output voltage of Li-CO<sub>2</sub> batteries to higher than 3.0 V, paving a promising avenue for the design and regulation of CO<sub>2</sub> conversion reactions.