Superior Lithium Storage Properties of beta-FeOOH

作者：Yu Linghui; Xi Shibo; Wei Chao; Zhang Wenyu; Du Yonghua^*; Yan Qingyu; Xu Zhichuan

来源：Advanced Energy Materials, 2015, 5(6): 1401517.

DOI：10.1002/aenm.201401517

• lithium-ion batteries
• porous electrodes
• anodes
• -FeOOH
• XANES

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, -FeOOH has shown a capacity of approximate to 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 approximate to 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.

• 出版日期2015-3-18