Journal
ENERGY STORAGE MATERIALS
Volume 52, Issue -, Pages 40-51Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2022.07.036
Keywords
Zn-ion aqueous battery; Nb2O5; Artificial layer; Zn-ion flux regulation; Orientated morphology
Funding
- National Research Foundation (NRF) of Korea - Ministry of Education [NRF-2021R1F1A1050130]
- Korea Basic Science Institute - Ministry of Education [2019R1A6C1010016]
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The research proposed the use of Nb2O5 film as a coating layer in aqueous rechargeable batteries, showing good performance in ensuring uniform ion flux and rapid transportation of zinc ions. The symmetric Nb2O5@Zn anode system demonstrated good stability and electrochemical performance under harsh cycling conditions.
Zn metal has recently emerged as a promising candidate for stable and reversible anode in aqueous rechargeable batteries. However, despite the high reversibility of Zn metal in aqueous media, Zn metal anode utilization is limited owing to unavoidable dilemmas, such as dendrite growth, hydrogen gas evolution, and dead Zn , eventually leading to battery breakdown. Herein, we propose a Nb2O5 film as an effective coating layer to guarantee uniform ion flux and a rapid transportation pathway for Zn ions through Maxwell-Wagner polari-zation, resulting in homogeneous Zn electrodeposition under the Nb2O5 layer. The artificial Nb2O5 layer coated on the Zn surface (Nb2O5@Zn) acted as a guide for Zn deposition, enabling a dense and uniform morphology of electrodeposited Zn oriented in a specific direction. The symmetric Nb2O5@Zn anode system exhibited stable plating/stripping for up to 1000 h. Outstanding durability and resilience (220 h at 5 mA cm(-2)/5 mAh cm(-2)) and rapid plating/stripping with excellent recovery (returning to 1 from 10 mA cm(-2)) were verified under harsh cycling conditions. The excellent characteristics of Nb2O5 layer resulted in high electrochemical stability and performance for a full cell with a VO2 cathode for practical applications.
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