Freestanding and Sandwich MXene-Based Cathode with Suppressed Lithium Polysulfides Shuttle for Flexible Lithium-Sulfur Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 35084869.
- Also identified by DOI 10.1021/acs.nanolett.1c04377.
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Abstract
Flexible lithium-sulfur (Li-S) batteries with high mechanical compliance and energy density are highly desired. This manuscript reported that large-area freestanding MXene (Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub>) film has been obtained through a scalable drop-casting method, significantly improving adhesion to the sulfur layer under the continuously bent. Titanium oxide anchored on holey Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> (TiO<sub>2</sub>/H-Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub>) was also produced by the well-controlled oxidation of few-layer Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub>, which greatly facilitates lithium ion transport as well as prevents the shuttling of lithium polysulfides. Therefore, the obtained sandwich electrode has demonstrated a high capacity of 740 mAh g<sup>-1</sup> at 2 C and a high capacity retention of 81% at 1 C after 500 cycles. Flexible Li-S batteries based on this sandwich electrode have a capacity retention as high as 95% after bending 500 times. This work provides effective design strategies of MXene for flexible batteries and wearable electronics.