4.8 Article

Revealing the Two-Dimensional Surface Diffusion Mechanism for Zinc Dendrite Formation on Zinc Anode

Journal

SMALL
Volume 18, Issue 43, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202104148

Keywords

aqueous zinc-ion batteries; protective layer; two-dimensional diffusion; zinc dendrite

Funding

  1. Hunan Provincial Science and Technology Plan Projects of China [2020JJ2042, 2018RS3009, 2017TP1001]
  2. National Nature Science Foundation of China [21975289]
  3. Fundamental Research Funds for the Central Universities Central South University [2021zzts0071]
  4. Department of Science and Technology of Guangdong Province, China [2019A050510043]
  5. Shenzhen Science and Technology Innovation Committee [JCYJ20180507183818040]
  6. Guangzhou International Collaboration Fund [201907010009]

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A protective copper nitride layer is constructed on the zinc metal anode to inhibit zinc dendrite growth effectively. By restricting the 2D atomic surface diffusion mechanism, stable zinc deposition with enhanced electrochemical stability is achieved.
Aqueous zinc-ion battery is regarded as one of the promising devices for large-scale energy storage systems owing to its high safety, cost-effectiveness, and competitive electrochemical properties. However, the dendrite growth on zinc metal anodes dramatically hinders its further practical applications, and the internal mechanism of dendrite evolution is still unclear. The introduction of a protective layer on the anode interface is an effective method to avoid zinc dendrite growth. Herein, a two-dimensional (2D) atomic surface diffusion mechanism is proposed to reveal the evolution of zinc deposition from tiny protrusion to dendrite under uneven electric and ionic fields. Further, the conductive copper nitride (CN) protective layer is constructed on the zinc metal anode by a facile and scalable magnetron sputtering approach. Their protective layer possesses a high zinc affinity and high diffusion barrier for zinc atom migration, leading to spacious nucleation, and uniform zinc deposition, thus significantly boosting the electrochemical stability. For the first time, the role of the restricted 2D atomic surface diffusion mechanism in inhibiting the formation of zinc tiny protrusion that induces uneven electric and ionic fields is revealed. This work can provide a novel insight for future research on dendrite-free zinc metal anodes by interfacial modification.

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