Sodium Ion Pre-Intercalation of δ-MnO2 Nanosheets for High Energy Density Aqueous Zinc-Ion Batteries

Authors:
Open Access
Publisher website
Google Scholar
Abstract
With the merits of low cost, environmental friendliness and rich resources, manganese dioxide is considered to be a promising cathode material for aqueous zinc-ion batteries (AZIBs). However, its low ion diffusion and structural instability greatly limit its practical application. Hence, we developed an ion pre-intercalation strategy based on a simple water bath method to grow in situ δ-MnO2 nanosheets on flexible carbon cloth substrate (MnO2), while pre-intercalated Na+ in the interlayer of δ-MnO2 nanosheets (Na-MnO2), which effectively enlarges the layer spacing and enhances the conductivity of Na-MnO2. The prepared Na-MnO2//Zn battery obtained a fairly high capacity of 251 mAh g−1 at a current density of 2 A g−1, a satisfactory cycle life (62.5% of its initial capacity after 500 cycles) and favorable rate capability (96 mAh g−1 at 8 A g−1). Furthermore, this study revealed that the pre-intercalation engineering of alkaline cations is an effective method to boost the properties of δ-MnO2 zinc storage and provides new insights into the construction of high energy density flexible electrodes.
Funding Information
  • National Natural Science Foundation of China (22005222, 2020ZDZX2004, 2020KQNCX087, 2019WGALH14, 2019AL022, 5041700133, 2020KQNCX090, 2022A1515110136, JZ202212)
  • Guangdong province innovation and strong school project (22005222, 2020ZDZX2004, 2020KQNCX087, 2019WGALH14, 2019AL022, 5041700133, 2020KQNCX090, 2022A1515110136, JZ202212)
  • Joint Science Foundation of Wuyi University and HK and Macao (22005222, 2020ZDZX2004, 2020KQNCX087, 2019WGALH14, 2019AL022, 5041700133, 2020KQNCX090, 2022A1515110136, JZ202212)
  • Science Foundation for High-level Talents of Wuyi University (22005222, 2020ZDZX2004, 2020KQNCX087, 2019WGALH14, 2019AL022, 5041700133, 2020KQNCX090, 2022A1515110136, JZ202212)
  • Innovation Foundation of Educational Com-mission Guangdong Province (22005222, 2020ZDZX2004, 2020KQNCX087, 2019WGALH14, 2019AL022, 5041700133, 2020KQNCX090, 2022A1515110136, JZ202212)
  • Guangdong Basic and Applied Basic Research Foundation (22005222, 2020ZDZX2004, 2020KQNCX087, 2019WGALH14, 2019AL022, 5041700133, 2020KQNCX090, 2022A1515110136, JZ202212)
  • Basic and Applied Basic Research Foundation of Jiangmen (22005222, 2020ZDZX2004, 2020KQNCX087, 2019WGALH14, 2019AL022, 5041700133, 2020KQNCX090, 2022A1515110136, JZ202212)

This publication has 48 references indexed in Scilit: