Small Things Make a Big Difference: Conductive Cross-Linking Sodium Alginate@MXene Binder Enables High-Volumetric-Capacity and High-Mass-Loading Li-S Battery.
basic_science · Level V
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- Record sourced from PubMed, PMID 37933820.
- Also identified by DOI 10.1021/acs.nanolett.3c03429.
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Abstract
Binders are crucial for maintaining the integrity of an electrode, and there is a growing need for integrating multiple desirable properties into the binder for high-energy batteries, yet significant challenges remain. Here, we successfully synthesized a new binder by cross-linking sodium alginate (SA) with MXene materials (Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub>). Besides the improved adhesion and mechanical properties, the integrated SA@Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> binder demonstrates much improved electronic conductivity, which enables ruling out the fluffy conductive additive from the electrode component with enhanced volumetric capacity. When SA@Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> is used to fabricate sulfur (S) cathodes, the conductive-additive-free electrode demonstrates extremely high capacity (1422 mAh cm<sup>-3</sup>/24.5 mAh cm<sup>-2</sup>) under an S loading of 17.2 mg cm<sup>-2</sup> for Li-S batteries. Impressively, the SA@Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> binder shows remarkable feasibility in other battery systems such as Na-S and LiFePO<sub>4</sub> batteries. The proposed strategy of constructing a cross-linking conductive binder opens new possibilities for designing high-mass-loading electrodes with high volumetric capacity.