Pseudocapacitive behavior of the Fe2 O3 anode and its contribution to high reversible capacity in lithium ion batteries

Nanoscale
Yimo XiangYusuke Yamauchi

Abstract

Pseudocapacitance, which is the storage of charge based on continuous and fast reversible redox reactions at the surface of electrode materials, is commonly observed for electrodes in lithium ion batteries, especially for transition metal oxide anodes. In this report, bare Fe2O3 of granular morphology (∼30 nm in diameter) with high purity and decent crystallinity as well as recommendable electrochemical performances is fabricated hydrothermally and employed as the subject to clarify pseudocapacitive behavior in transition metal oxide anodes. Electrochemical technologies such as galvanostatic charging/discharging, differential capacity analysis (dQ/dV) and the power law relationship (i = aνb), which can distinguish pseudocapacitive behaviors of an electrode reaction were employed to analyze the electrodes. Reversible capacities of ∼120 mA h g-1 (0.117 F cm-2) for Fe2O3 were found within particular electrochemical windows (2.3-3.0 V, 0.3-0.8 V for discharging and 2.2-3.0 V, 0.3-1.3 V for charging). A new direction of optimizing the capacities, rate and cycling performances for lithium ion batteries is pointed out with connections between the pseudocapacitive behavior and morphologies of surfaces as well as structures of the elect...Continue Reading

References

Jun 18, 2011·Chemical Communications : Chem Comm·Zhiyu WangXiong Wen David Lou
Sep 6, 2011·Journal of the American Chemical Society·M SathiyaA K Shukla
Oct 8, 2011·Journal of the American Chemical Society·Bao WangXiong Wen Lou
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May 6, 2014·ACS Applied Materials & Interfaces·Guoyong HuangHongyu Sun

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Citations

Jul 10, 2020·Scientific Reports·Elochukwu Stephen AgudosiNurizan Omar

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Methods Mentioned

BETA
X-ray
transmission electron microscopy

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