Molecular-Level Anion and Li+ Co-Regulation by Amphoteric Polymer Separator for High-Rate Stable Lithium Metal Anode

Shizhen Li; Hangqi Yang; Mengzi Geng; Hainam Do; Chuang Peng

doi:10.1021/acs.nanolett.3c04333

Molecular-Level Anion and Li⁺ Co-Regulation by Amphoteric Polymer Separator for High-Rate Stable Lithium Metal Anode

Shizhen Li, Hangqi Yang, Mengzi Geng, Hainam Do, Chuang Peng

Department of Chemical and Environmental Engineering

Research output: Journal Publication › Article › peer-review

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-g-PE) is reported. The densely and uniformly distributed positive -NH₂ and negative −CHNO- groups efficiently restrict the anion migration and promote Li⁺ 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^-2 and a practical areal capacity of 5 mAh cm^-2.

Original language	English
Pages (from-to)	486-492
Number of pages	7
Journal	Nano Letters
Volume	24
Issue number	1
DOIs	https://doi.org/10.1021/acs.nanolett.3c04333
Publication status	Published - 10 Jan 2024

Keywords

anion−cation coregulation
hyperbranched polyamidoamine
lithiophilic and anionphilic sites
lithium sulfur battery
stable lithium metal anode

ASJC Scopus subject areas

Bioengineering
General Chemistry
General Materials Science
Condensed Matter Physics
Mechanical Engineering

Access to Document

10.1021/acs.nanolett.3c04333

Cite this

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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-g-PE) is reported. The densely and uniformly distributed positive -NH2 and negative −CHNO- groups efficiently restrict the anion migration and promote Li+ 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-2 and a practical areal capacity of 5 mAh cm-2.",

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AU - Peng, Chuang

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