Unveiling the Nature of Ultrastable Potassium Storage in Bi<sub>0.48</sub>Sb<sub>1.52</sub>Se<sub>3</sub> Composite.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 37184205.
- Also identified by DOI 10.1021/acsnano.3c01260.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
The conversion and alloying-type anodes for potassium-ion batteries (PIBs) have drawn attention. However, it is still a challenge to relieve the huge volume expansion/electrode pulverization. Herein, we synthesized a composite material comprising Bi<sub>0.48</sub>Sb<sub>1.52</sub>Se<sub>3</sub> nanoparticles uniformly dispersed in carbon nanofibers (Bi<sub>0.48</sub>Sb<sub>1.52</sub>Se<sub>3</sub>@C). Benefiting from the synergistic effects of the high electronic conductivity of Bi<sub>0.48</sub>Sb<sub>1.52</sub>Se<sub>3</sub> and the mechanical confinement of the carbon fiber that buffers the large chemomechanical stress, the Bi<sub>0.48</sub>Sb<sub>1.52</sub>Se<sub>3</sub>@C//K half cells deliver a high reversible capacity (491.4 mAh g<sup>-1</sup>, 100 cycles at 100 mA g<sup>-1</sup>) and an extraordinary cyclability (80% capacity retention, 1000 cycles at 1000 mA g<sup>-1</sup>). Furthermore, the Bi<sub>0.48</sub>Sb<sub>1.52</sub>Se<sub>3</sub>@C-based PIB full cells achieve a high energy density of 230 Wh kg<sup>-1</sup>. <i>In situ</i> transmission electron microscopy (TEM) reveals an intercalation, conversion, and alloying three-step reaction mechanism and a reversible amorphous transient phase. More impressively, the nanofiber electrode can almost return to its original diameter after the potassiation and depotassiation reaction, indicating a highly reversible volume change process, which is distinct from the other conversion type electrodes. This work reveals the stable potassium storage mechanisms of Bi<sub>0.48</sub>Sb<sub>1.52</sub>Se<sub>3</sub>@C composite material, which provides an effective strategy to enable conversion/alloying-type anodes for high performance PIBs for energy storage applications.