Clean Preparation of Fe2SiO4 Coated Fe2O3 Integrated With Graphene for Li-ion Storage Application
2022
Li, Ruiping | Kamali, Ali Reza
Ferric oxide (Fe₂O₃) is an attractive candidate for energy storage applications, including anode of Li-ion batteries due to its low-cost, high availability and large theoretical capacity. However, the mineral suffers from poor cyclability and rate performance due to the combination of rapid disintegration of the compound upon Li-ion insertion and extraction cycles, and poor conductivity of the electrode. Here, for the first time, we report on the clean modification of ferric oxide using corn-derived silica and graphite-derived graphene nanosheets, using a facile calcination-mechanical integration approach, without the involvement of environmentally-problematic raw materials. The product (Fe₂O₃@Fe₂SiO₄@G) consists of ferric oxide particles coated with iron silicate; and these hybrid particles are integrated with graphene nanosheets. The presence of Fe₂SiO₄ layers could relieve the volume changes of Fe₂O₃ involved in the cycling, and also improves the ionic conductivity reducing the interfacial resistance between the electrode and the electrolyte, while graphene nanosheets improves the electrical conductivity of the electrode. Thus Fe₂O₃@Fe₂SiO₄@G electrode considerably outperforms the initial Fe₂O₃ with outstanding Li-ion storage capacities of 822.9 and 422.2mAh g⁻¹ recorded at the current densities of 100 and 1000mAg⁻¹, respectively, after 300 cycles. Pseudocapacitive behavior of the electrode is found to be 76.6% at 1mVs⁻¹, confirming the promotion of surface interactions in the nanostructured hybrid material. This article suggests a clean way of modifying naturally occurring Fe₂O₃ to be used as the anode of lithium ion batteries.
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