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Title: Artificial Solid Electrolyte Interphase for Suppressing Surface Reactions and Cathode Dissolution in Aqueous Zinc Ion Batteries

Journal Article · · ACS Energy Letters

Vanadium-based compounds have been widely used as electrode materials in aqueous zinc ion batteries (ZIBs) due to the multiple oxidation states of vanadium and their open framework structure. However, the solubility of vanadium in aqueous electrolytes and the formation of byproducts during the charge/discharge process cause severe capacity fading and limit cycle life. Here in this paper, we report an ultrathin HfO2 film as an artificial solid electrolyte interphase (SEI) that is uniformly and conformally deposited by atomic layer deposition (ALD). The inactive hafnium(IV) oxide (HfO2) film not only decreases byproduct (Zn4SO4(OH)6·xH2O) formation on the surface of Zn3V2O7(OH)2·2H2O (ZVO) but also suppresses the ZVO cathode dissolution in the electrolyte. As a result, the obtained HfO2-coated ZVO cathodes deliver higher capacity and better cycle life (227 mAh g–1@100 mA g–1, 90% retention over 100 cycles) compared with pristine ZVO (170 mAh g–1@100 mA g–1, 45% retention over 100 cycles). A mechanistic investigation of the role of HfO2 is presented, along with data showing that our method constitutes a general strategy for other cathodes to enhance their performance in aqueous ZIBs.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE; King Abdullah University of Science and Technology (KAUST)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1595139
Journal Information:
ACS Energy Letters, Vol. 4, Issue 12; ISSN 2380-8195
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 144 works
Citation information provided by
Web of Science

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Figures / Tables (4)