Yu, L. H.; Xi, S. B.; Wei, C.; Zhang, W. Y.; Du, Y. H.; Yan, Q. Y.; Xu, Z. C., Superior lithium storage properties of β-FeOOH. Advanced Energy Materials 2015, 5 (6), DOI: 10.1002/aenm.201401517.
Several crystal forms of FeOOH are recently reported to be highly promising for lithium storage due to their high capacity, low cost, and environmental friendliness. In particular, β-FeOOH has shown a capacity of ≈1000 mAh g−1, which is comparable to other promising iron-based anodes, such as Fe2O3 and Fe3O4. However, its storage mechanisms are unclear and the potential for further improvement remains unexplored. Here, it is shown that this material can have a very high reversible capacity of ≈1400 mAh g−1, which is 20%–40% higher than Fe2O3 and Fe3O4. Such a high capacity is delivered from a series of reactions including intercalation and conversion reactions, formation/deformation of solid-state electrolyte interface layers and interfacial storage. The mechanisms are studied by a combination of electrochemical and X-ray absorption near edge spectroscopic approaches. Moreover, very long cycling performance, that is, after even more than 3000 cycles the material still has a significant capacity of more than 800 mAh g−1, is obtained by a simple electrode design involving introducing a rigid support into porous electrodes. Such long cycling performance is for the first time achieved for high-capacity materials based on conversion reactions.
This work was funded by MOE Tier 1 Grant (RGT13/13) of Singapore and the Singapore National Research Foundation under its Campus for Research Excellence And Technological Enterprise (CREATE) programme.
This is the peer reviewed version of the following article: Yu, L. H.; Xi, S. B.; Wei, C.; Zhang, W. Y.; Du, Y. H.; Yan, Q. Y.; Xu, Z. C., Superior lithium storage properties of β-FeOOH. Advanced Energy Materials 2015, 5 (6), DOI: 10.1002/aenm.201401517, which has been published in final form at https://dx.doi.org/10.1002/aenm.201401517. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.