Journal
ENERGY STORAGE MATERIALS
Volume 42, Issue -, Pages 715-722Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2021.08.017
Keywords
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Funding
- National Natural Science Foundation of China [91963210, U1801255, 51872340]
- General Program of Natural Science Foundation of Guangdong Province, China [2021A1515010143]
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A unique dual-ion battery based on zinc hexacyanoferrate cathode and zinc metal anode was developed, showing outstanding rate performance and cycling life.
Rechargeable zinc-based batteries (RZBs) using low-cost zinc metal anodes are feasible for large-scale energy storage, but the developments currently are restricted by the poor performances. Here we constructed a particular dual-ion battery (DIB) based on zinc hexacyanoferrate (ZnHCF) cathode, zinc metal anode, and non-aqueous K+/Zn2+ hybrid ions electrolyte. It was revealed that K+-ions occupied almost all the cavities in ZnHCF at high voltage over 1.7 V (vs. Zn2+/Zn), which effectively blocked Zn2+-ions insertion. The ZnHCF showed a zero-strain characteristic during the repeated K+-ions intake/removal. Meanwhile, the charge screening effect of additive K+-ions on optimizing the zinc electrodeposition process ensured the reversible and dendrite-free Zn plating/stripping. The DIBs demonstrated excellent rate performances (57 and 47 mAh g(cathode)(-1) at 2000 and 5000 mA g(-1), respectively) and incredibly 100,000-cycles life with 74% capacity retention.
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