期刊
ADVANCED MATERIALS
卷 31, 期 32, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201901521
关键词
activation; C-coordinated Fe; Prussian blue analogue; ultralong lifespan; zinc hybrid-ion batteries
类别
资金
- GRF Scheme [CityU 11305218] Funding Source: Medline
- Science Technology and Innovation Committee of Shenzhen Municipality [JCYJ20170818103435068] Funding Source: Medline
Prussian blue analogue (PBA)-type metal hexacyanoferrates are considered as significant cathodes for zinc batteries (ZBs). However, these PBA-type cathodes, such as cyanogroup iron hexacyanoferrate (FeHCF), suffer from ephemeral lifespan (<= 1000 cycles), and inferior rate capability (1 A g(-1)). This is because the redox active sites of multivalent iron (Fe(III/II)) can only be very limited activated and thus utilized. This is attributed to the spatial resistance caused by the compact cooperation interaction between Fe and the surrounded cyanogroup, and the inferior conductivity. Here, it is found that high-voltage scanning can effectively activate the C-coordinated Fe in FeHCF cathode in ZBs. Thanks to this activation, the Zn-FeHCF hybrid-ion battery achieves a record-breaking cycling performance of 5000 (82% capacity retention) and 10 000 cycles (73% capacity retention), respectively, together with a superior rate capability of maintaining 53.2% capacity at superhigh current density of 8 A g(-1) (approximate to 97 C). The reversible distortion and recovery of the crystalline structure caused by the (de)insertion of zinc and lithium ions is revealed. It is believed that this work represents a substantial advance on PBA electrode materials and may essentially promote application of PBA materials.
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