4.8 Article

A Self-Healing Amalgam Interface in Metal Batteries

Journal

ADVANCED MATERIALS
Volume 32, Issue 43, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202004798

Keywords

amalgam; metal batteries; solid-state electrolytes

Funding

  1. Guangdong Natural Science Foundation, China [2019A1515012041]
  2. Natural Science Foundation of China [51372042, 51872053, 51920105004]
  3. NSFC-Guangdong Joint Fund [U1501246]
  4. China Postdoctoral Science Foundation
  5. Discovery program from the Australian Research Council

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Poor cyclability and safety concerns caused by the uncontrollable dendrite growth and large interfacial resistance severely restrict the practical applications of metal batteries. Herein, a facile, universal strategy to fabricate ceramic and glass phase compatible, and self-healing metal anodes is proposed. Various amalgam-metal anodes (Li, Na, Zn, Al, and Mg) show a long cycle life in symmetric cells. It has been found that liquid Li amalgam shows a complete wetting with the surface of lanthanum lithium titanate electrolyte and a glass-phase solid-state electrolyte. The interfacial compatibility between the lithium metal anode and solid-state electrolyte is dramatically improved by using an in situ regenerated amalgam interface with high electron/ion dual-conductivity, obviously decreasing the anode/electrolyte interfacial impedance. The lithium-amalgam interface between the metal anode and electrolyte undergoes a reversible isothermal phase transition between solid and liquid during the cycling process at room temperature, resulting in a self-healing surface of metal anodes.

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