Stable zinc anode solid electrolyte interphase via inner Helmholtz plane engineering

The inner Helmholtz plane and thus derived solid-electrolyte interphase (SEI) are crucial interfacial structure to determine the electrochemical stability of Zn-ion battery (ZIB). In this work, we demonstrate that introducing β-cyclodextrins (CD) as anion-receptors into Zn(OTf)2 aqueous electrolyte could significantly optimize the Zn anode SEI structure for achieving stable ZIB. Specifically, β-CD with macrocyclic structure holds appropriate cavity size and charge distribution to encase OTf- anions at the Zn metal surface to form β-CD@OTf- dominated inner Helmholtz structure. Meanwhile, the electrochemically triggered β-CD@OTf- decomposition could in situ convert to the organic-inorganic hybrid SEI…

• NN
  National Natural Science Foundation of China

  Awards: 52003188, T2188101, 22173066
• GO
  Government of Jiangsu Province
• NS
  Natural Science Foundation of Jiangsu Province

  Awards: BK20200871, BK20230065
• DU
  Donghua University

  Award: KF2104
• SK
  State Key Laboratory for Modification of Chemical Fibers and Polymer Materials

  Award: KF2104