Abstract
Aqueous rechargeable zinc ion batteries (ARZIBs)is considered one of the most compelling candidates for grid-scale energy storage owing to their cost effectiveness, good safety, eco-friendliness, high output voltage, and high capacity. However, their practical applications are still largely limited by the undesirable cyclability and high-rate capability. Here, we report a discovery that using a small amount (2 vol%)of diethyl ether (Et2O)as the electrolyte additive could largely improve the performance of Zn–MnO2 batteries. The addition of Et2O yielded the first cycle coulombic efficiency of 95.6% at 50 mA/g, a high capacity of 115.9 mAh/g at 5 A/g and 97.7% retention of initial capacity after 4000 cycles, demonstrating an outstanding rate capability and cycling performance among the reported Mn-based zinc ions batteries in mild electrolyte. Ex-situ characterizations revealed that appropriate amount of Et2O molecules could effectively suppress the formation of Zn dendrites on Zn anode, which is the main mechanism for cyclability improvements.
Original language | English |
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Pages (from-to) | 275-281 |
Number of pages | 7 |
Journal | Nano Energy |
Volume | 62 |
DOIs | |
State | Published - 1 Aug 2019 |
Externally published | Yes |
Keywords
- Dendrite suppression
- Electrolyte additive
- Zinc ion battery
- Zinc metal
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- General Materials Science
- Electrical and Electronic Engineering