Fe-Based Oxides

Iron oxides are also considered to be a candidate for anode material for LIBs because of their low cost, low toxicity and high level of safety. ° Amounts of researches were performed on a-Fe203. There are three steps involving in the lithiation process of a-Fe203, written as follows  

For the a-Fe203 nanoparticles (20 nm), 0.5 mol Li can be reversibly intercalated in the potential range of 1.5-4.0 V vs. Li/Li+ when decreasing the intercalation cutoff voltage to 0.9 

V Li/Li+, 2.0 mol Li could be intercalated (Eq. 5.2), but they cannot be extracted by electrochemical charging without destroying the crystal structure. When further discharge with Li to 0.005 

Li/Li+, 8.5 mol Li could react with Fe203, accompanying a destruction of crystal structure and formation of iron metal Li20 and polymer layer on iron metal coming from the decomposition of electrol5d e (Eq. 5.3). When charging the electrode to 3.0 V, conversion reaction of nanoscaled Fe with Li20 results in the release of Li ions and electrons (Eq. 5.4).  

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Minowa H, Hayashi M, Hayashi K, Kobayashi R, Takahashi K (2013) Mn-Fe-based oxide electrocatalysts for air electrodes of lithium-air batteries. J Power Sources 244 17-22... 

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