A tellurium iodide perovskite structure enabling eleven-electron transfer in zinc ion batteries.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39779662.
- Also identified by DOI 10.1038/s41467-024-55385-6 and PMC identifier 11711384.
- Licence recorded as CC BY-NC-ND.
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Abstract
The growing potential of low-dimensional metal-halide perovskites as conversion-type cathode materials is limited by electrochemically inert B-site cations, diminishing the battery capacity and energy density. Here, we design a benzyltriethylammonium tellurium iodide perovskite, (BzTEA)<sub>2</sub>TeI<sub>6</sub>, as the cathode material, enabling X- and B-site elements with highly reversible chalcogen- and halogen-related redox reactions, respectively. The engineered perovskite can confine active elements, alleviate the shuttle effect and promote the transfer of Cl<sup>-</sup> on its surface. This allows for the utilization of inert high-valent tellurium cations, eventually realizing a special eleven-electron transfer mode (Te<sup>6+</sup>/Te<sup>4+</sup>/Te<sup>2-</sup>, I<sup>+</sup>/I<sup>0</sup>/I<sup>-</sup>, and Cl<sup>0</sup>/Cl<sup>-</sup>) in suitable electrolytes. The Zn||(BzTEA)<sub>2</sub>TeI<sub>6</sub> battery exhibited a high capacity of up to 473 mAh g<sup>-1</sup><sub>Te/I</sub> and a large energy density of 577 Wh kg<sup>-1</sup> <sub>Te/I</sub> at 0.5 A g<sup>-1</sup>, with capacity retention up to 82% after 500 cycles at 3 A g<sup>-1</sup>. The work sheds light on the design of high-energy batteries utilizing chalcogen-halide perovskite cathodes.