Abstract
Owing to the high capacity of the metallic Zn anode and intrinsically safe aqueous electrolyte, aqueous Zn-based batteries are advanced energy storage technology alternatives beyond lithium-ion batteries, providing a cost benefit, high safety, and competitive energy density. There has been a new wave of research interest across the family of Zn batteries, but fundamental understanding of the Zn electrode and its performance improvement still remain inconclusive. Based on the pH value of the electrolyte, Zn-based batteries can be divided into two types, with one adopting alkaline electrolyte and the other mild (including slightly acidic) electrolyte. As the behavior of the Zn electrode in these two distinctive systems is different, their requirements to yield excellent performance are different. In this Review, we present a comprehensive overview of the Zn electrode and its fundamentals in both systems. First, the differences and similarities of the Zn electrode in both systems are outlined. Specific attention is paid to the working principles and technical challenges. Then, Zn electrode issues and recently proposed strategies for each system are summarized and compared. Finally, a perspective on future research directions towards practical applications of aqueous Zn batteries is included. © The Royal Society of Chemistry 2020.
| Original language | English |
|---|---|
| Pages (from-to) | 3917-3949 |
| Journal | Energy and Environmental Science |
| Volume | 13 |
| Issue number | 11 |
| Online published | 5 Sept 2020 |
| DOIs | |
| Publication status | Published - 1 Nov 2020 |
| Externally published | Yes |
Funding
Financial support provided by the Australian Research Council (ARC) (FT150100109, LP160101629, and DP200101862) is gratefully acknowledged. X. L. and X. Z. acknowledge the China Scholarship Council (CSC) for their scholarship support (Grant No. 201806120317 and 201706370084). The authors would also like to thank Dr Tania Silver for performing critical revisions of the manuscript.
