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https://hdl.handle.net/2440/132223
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Type: | Journal article |
Title: | Structural insight into layer gliding and lattice distortion in layered manganese oxide electrodes for potassium-ion batteries |
Author: | Zhang, Q. Didier, C. Pang, W.K. Liu, Y. Wang, Z. Li, S. Peterson, V.K. Mao, J. Guo, Z. |
Citation: | Advanced Energy Materials, 2019; 9(30):1900568-1-1900568-9 |
Publisher: | Wiley |
Issue Date: | 2019 |
ISSN: | 1614-6832 1614-6840 |
Statement of Responsibility: | Qing Zhang, Christophe Didier, Wei Kong Pang, Yajie Liu, Zhijie Wang, Sean Li, Vanessa K. Peterson, Jianfeng Mao, and Zaiping Guo |
Abstract: | Potassium-ion batteries (PIBs) are an emerging, affordable, and environmentally friendly alternative to lithium-ion batteries, with their further development driven by the need for suitably performing electrode materials capable of reversibly accommodating the relatively large K⁺. Layer-structured manganese oxides are attractive as electrodes for PIBs, but suffer from structural instability and sluggish kinetics of K⁺ insertion/extraction, leading to poor rate capability. Herein, cobalt is successfully introduced at the manganese site in the KₓMnO₂ layered oxide electrode material and it is shown that with only 5% Co, the reversible capacity increases by 30% at 22 mA g⁻¹ and by 92% at 440 mA g⁻¹. In operando synchrotron X-ray diffraction reveals that Co suppresses Jahn–Teller distortion, leading to more isotropic migration pathways for K⁺ in the interlayer, thus enhancing the ionic diffusion and consequently, rate capability. The detailed analysis reveals that additional phase transitions and larger volume change occur in the Co-doped material as a result of layer gliding, with these associated with faster capacity decay, despite the overall capacity remaining higher than the pristine material, even after 500 cycles. These results assert the importance of understanding the detailed structural evolution that underpins performance that will inform the strategic design of electrode materials for high-performance PIBs. |
Keywords: | Cobalt doping; cooperative Jahn–Teller distortions; potassium-ion batteries; rate capability |
Rights: | © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim |
DOI: | 10.1002/aenm.201900568 |
Grant ID: | http://purl.org/au-research/grants/arc/FT150100109 http://purl.org/au-research/grants/arc/FT160100251 http://purl.org/au-research/grants/arc/LP160101629 http://purl.org/au-research/grants/arc/DP170102406 http://purl.org/au-research/grants/arc/LE180100141 |
Published version: | http://dx.doi.org/10.1002/aenm.201900568 |
Appears in Collections: | Chemical Engineering publications |
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