首页|A novel Mn2+-additive free Zn/MnO2 battery with 2.4 V voltage window and enhanced stability
A novel Mn2+-additive free Zn/MnO2 battery with 2.4 V voltage window and enhanced stability
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NSTL
Elsevier
? 2022 Elsevier B.V.Recently, aqueous Zn/MnO2 batteries have attracted considerable attention due to their safety, low cost, and environmental friendliness. However, capacity decay caused by Mn dissolution greatly limits their further development. Herein, the synergistic effect of cathode passivation and electrolyte engineering was employed to widen the voltage window and improve the cycling stability of Zn/ε-MnO2 batteries. The cathode passivation process not only inhibits water decomposition at high voltage but also suppresses the Mn dissolution during discharge process. Meanwhile, the addition of LiTFSI in electrolyte can also effectively suppress the hydrogen evolution, significantly improving the Coulombic efficiency (CE) and stability of Zn stripping/plating processes. As a result, voltage window of 0.8–2.4 V is achieved and the dissolved Mn2+ ions are redeposited on the cathode at ≈ 2.2 V. The Mn2+-additive free Zn/ε-MnO2 battery maintains 80% capacity even after 300 cycles at 0.5 A g?1 and exhibits long term stability of more than 2000 cycles at 5.0 A g?1 with a specific capacity of 113 mAh g?1.
2.4 V voltage windowMn redepositionMn2+-additive free electrolyteZn/MnO2 batteries
Chen Y.、Gu S.、Zhou J.、Chen X.、Zhang K.、Sun Z.、Lu Z.
展开 >
Department of Mechanical Engineering City University of Hong Kong
School of Materials and Energy Guangdong University of Technology
Department of Materials Science and Engineering Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices Southern University of Science and Technology
NSTL
Elsevier
