Cryptomelane-Type KMn8 O16 as Potential Cathode Material - for Aqueous Zinc Ion Battery

Frontiers in Chemistry
Jiajie CuiZeqiang He

Abstract

Aqueous battery has been gained much more interest for large-scale energy storage fields due to its excellent safety, high power density and low cost. Cryptomelane-type KMn8O16 confirmed by X-ray diffraction (XRD) was successfully synthesized by a modified hydrothermal method, followed by annealed at 400°C for 3 h. The morphology and microstructure of as-prepared KMn8O16 investigated by field-emission scanning electron microscopy (FE-SEM) with the energy spectrum analysis (EDS) and transmission electron microscopy (TEM) demonstrate that one-dimensional nano rods with the length of about 500 nm constitute the microspheres with the diameter about 0.5~2 μm. The cyclic voltammetry measurement displays that the abundant intercalation of zinc ions on the cathode takes place during the initial discharge process, indicating that cryptomelane-type KMn8O16 can be used as the potential cathode material for aqueous zinc ion batteries. The electrode shows a good cycling performance with a reversible capacity of up to 77.0 mAh/g even after 100 cycles and a small self-discharge phenomenon.

References

May 20, 1994·Science·W LiD S Wainwright
Sep 18, 2013·Chemical Communications : Chem Comm·Hanping ZhangXiaojian Yang
Apr 30, 2015·Chemical Communications : Chem Comm·Boeun LeeSi Hyoung Oh
Apr 28, 2016·ACS Applied Materials & Interfaces·Zhen LiuFrank Endres
Feb 28, 2017·ACS Applied Materials & Interfaces·Kyung E K SunP Chen

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Methods Mentioned

BETA
X-ray
transmission electron microscopy
electron diffraction

Software Mentioned

XPS peak

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