Reversible Zn/polymer heterogeneous anode

Lingyun Xiong, Hao Fu, Kai Yang, Ji Young Kim, Ren Ren, Joong Kee Lee, Woochul Yang, Guicheng Liu

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Commercialization of Zn-metal anodes with low cost and high theoretical capacity is hindered by the poor reversibility caused by dendrites growth, side reactions, and the slow Zn2+-transport and reaction kinetics. Herein, a reversible heterogeneous electrode of Zn-nanocrystallites/polyvinyl-phosphonic acrylamide (Zn/PPAm) with fast electrochemical kinetics is designed for the first time: phosphonic acid groups with strong polarity and chelation effect ensure structural reversibility and stability of the three-dimensional Zn-storage-host PPAm network and the Zn/PPAm hybrid; hydrophobic carbon chains suppress side reactions such as hydrogen evolution and corrosion; weak electron-donating amide groups constitute Zn2+-transport channels and promote “desolvation” and “solvation” effects of Zn2+ by dragging the PPAm network on the Zn-metal surface to compress/stretch during Zn plating/stripping, respectively; and the heterostructure and Zn nanocrystallites suppress dendrite growth and enhance electrochemical reactivity, respectively. Thus, the Zn/PPAm electrode shows cycle reversibility of over 6000 h with a hysteresis voltage as low as 31 mV in symmetrical cells and excellent durability and flexibility in fiber-shaped batteries.

Original languageEnglish
Article numbere370
JournalCarbon Energy
Volume5
Issue number6
DOIs
StatePublished - Jun 2023

Keywords

  • dendrite-free
  • electrode process kinetics
  • fiber-shaped battery
  • reversible metal/polymer heterostructure
  • Zn-metal anode

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