Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/130362
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Type: Journal article
Title: Evidence of solid-solution reaction upon lithium insertion into cryptomelane K₀⋅₂₅Mn₂O₄ material
Other Titles: Evidence of solid-solution reaction upon lithium insertion into cryptomelane K(0)<NON-ASCII>⋅(8901)<NON-ASCII>(25)Mn(2)O(4) material
Author: Pang, W.K.
Peterson, V.K.
Sharma, N.
Zhang, C.
Guo, Z.
Citation: The Journal of Physical Chemistry C: Energy Conversion and Storage, Optical and Electronic Devices, Interfaces, Nanomaterials, and Hard Matter, 2014; 118(8):3976-3983
Publisher: American Chemical Society
Issue Date: 2014
ISSN: 1932-7447
1932-7455
Statement of
Responsibility: 
Wei Kong Pang, Vanessa K. Peterson, Neeraj Sharma, Chaofeng Zhang and Zaiping Guo
Abstract: Cryptomelane-type K0.25Mn2O4 material is prepared via a template-free, one-step hydrothermal method. Cryptomelane K0.25Mn2O4 adopts an I4/m tetragonal structure with a distinct tunnel feature built from MnO6 units. Its structural stability arises from the inherent stability of the MnO6 framework which hosts potassium ions, which in turn permits faster ionic diffusion, making the material attractive for application as a cathode in lithium-ion batteries. Despite this potential use, the phase transitions and structural evolution of cryptomelane during lithiation and delithiation remain unclear. The coexistence of Mn3+ and Mn4+ in the compound during lithiation and delithiation processes induces different levels of Jahn–Teller distortion, further complicating the lattice evolution. In this work, the lattice evolution of the cryptomelane K0.25Mn2O4 during its function as a cathode within a lithium-ion battery is measured in a customized coin cell using in situ synchrotron X-ray diffraction. We find that the lithiation–delithiation of cryptomelane cathode proceeds through a solid-solution reaction, associated with variations of the a and c lattice parameters and a reversible strain effect induced by Jahn–Teller distortion of Mn3+. The lattice parameter changes and the strain are quantified in this work, with the results demonstrating that cryptomelane is a relatively good candidate cathode material for lithium-ion battery use.
Keywords: Potassium; transition metals; lithium; lattices; ions
Rights: © 2014 American Chemical Society
DOI: 10.1021/jp411687n
Grant ID: http://purl.org/au-research/grants/arc/DP1094261
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Chemistry and Physics publications

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