Molecular-Level Anion and Li<sup>+</sup> Co-Regulation by Amphoteric Polymer Separator for High-Rate Stable Lithium Metal Anode.
basic_science · Level V
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- Record sourced from PubMed, PMID 38147568.
- Also identified by DOI 10.1021/acs.nanolett.3c04333.
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Abstract
Regulating ion transport is a prevailing strategy to suppress lithium dendrite growth, in which the distribution of ion regulatory sites plays an important role. Here a hyperbranched polyamidoamine (HBPA) grafted polyethylene (PE) composite separator (HBPA-<i>g</i>-PE) is reported. The densely and uniformly distributed positive -NH<sub>2</sub> and negative -CHNO- groups efficiently restrict the anion migration and promote Li<sup>+</sup> transport at the surface of the lithium metal anode. The obtained Li foil symmetric cell delivers a stable cycle performance with a low-voltage hysteresis of 130 mV for over 1500 h (3000 cycles) at an ultrahigh current density of 20 mA cm<sup>-2</sup> and a practical areal capacity of 5 mAh cm<sup>-2</sup>. Moreover, HBPA-<i>g</i>-PE separator enables a practical lithium-sulfur battery to achieve over 200-cycle stable performance with initial and retained capacity of 700 and 455 mAh g<sup>-1</sup>, at a high sulfur loading of 4 mg cm<sup>-2</sup> and a low electrolyte content/sulfur loading ratio of 8 μL mg<sup>-1</sup>.