Affordable Access

Publisher Website

Hewettite ZnV6 O16 ⋅ 8H2 O with Remarkably Stable Layers and Ultralarge Interlayer Spacing for High-Performance Aqueous Zn-Ion Batteries.

  • Zhu, Kaiyue1
  • Jiang, Weikang1, 2
  • Wang, Zhengsen1, 3
  • Li, Weijian1, 3
  • Xie, Weili1, 3
  • Yang, Hanmiao1, 3
  • Yang, Weishen1, 2
  • 1 State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China. , (China)
  • 2 Department of Chemical Physics, University of Science and Technology of China, Anhui, 230026, Hefei, China. , (China)
  • 3 University of Chinese Academy of Sciences, Beijing, 100049, China. , (China)
Published Article
Angewandte Chemie International Edition in English
Wiley (John Wiley & Sons)
Publication Date
Oct 04, 2022
DOI: 10.1002/anie.202213368
PMID: 36195973


Aqueous Zn-ion batteries (ZIBs) are promising candidates for grid-scale energy storage because of their intrinsic safety, low-cost and high energy-intensity. Vanadium-based materials are widely used as the cathode of ZIBs, especially A2 V6 O16 ⋅ nH2 O (AVO, A=NH4 + , Na, K). However, AVO suffers from serious dissolution, phase transformation and narrow gallery spacing (∼3 Å), leading to poor cycling stability and rate capability. Herein, we unveiled the root cause of the performance degradation in the AVO cathode and therefore developed a new high-performance cathode of ZnV6 O16 ⋅ 8H2 O (ZVO) for ZIB. Through a method of ion exchange induced phase transformation, AVO was converted to hewettite ZVO with larger gallery spacing (∼6 Å) and more stable V6 O16 layers. ZVO cathode thus constructed delivers a high capacity of 365 and 170 mAh g-1 at 0.5 and 15 A g-1 , while 86 % and 70 % of its capacity are retained at 0.5 A g-1 after 300 cycles and at 15 A g-1 after 10000 cycles, substantially better than conventional AVO. © 2022 Wiley-VCH GmbH.

Report this publication


Seen <100 times