期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 7, 期 25, 页码 15371-15377出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta03753e
关键词
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资金
- National Natural Science Foundation of China [21671015, 21521005]
- Fundamental Research Funds for the Central Universities [buc-tylkxj01, XK1802-6, BHYC1702B]
A CoFe layered double hydroxide (LDH) with nitrates in its interlayer has been developed for the first time as an intercalation-type anode material for sodium ion batteries (SIBs). Unlike the well-recognized conversion reaction for metal hydroxides in lithium ion batteries, an exceptional intercalation/de-intercalation mechanism for Na+-storage was revealed. The CoFe-NO3--LDH anode delivers an initial discharge capacity of 498 mA h g(-1) and a reversible capacity of 209 mA h g(-1) after 200 cycles at 1 A g(-1). The superb Na+-storage performance is attributed to the expanded interlayer distance of the CoFe-LDH pillared by the interlayer nitrates, benefiting the intercalation/de-intercalation of Na+ ions. Besides, the topochemical transformation property of LDH materials guarantees high structural stability during the valence state change of Co2+/Co2-x and Fe2+/Fe3+ in their host layers. In addition, theoretical calculation reveals a low Na+ diffusion barrier of 0.147 eV in the interlayer space of CoFe-NO3--LDH, which manifests LDH as a good Na+ ion conductor. Therefore, this work not only develops a novel intercalation-type anode for SIBs, but also provides new insights into the energy-storage mechanism of layered metal hydroxides.
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