Volume 4, Issue 11 pp. 1358-1368
Full Paper

Potassium-Based α-Manganese Dioxide Nanofiber Binder-Free Self-Supporting Electrodes: A Design Strategy for High Energy Density Batteries

Dr. Altug S. Poyraz

Dr. Altug S. Poyraz

Brookhaven National Laboratory, Upton, NY, 11973 USA

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Jianping Huang

Jianping Huang

Department of Chemistry, Stony Brook University, Stony Brook, NY, 11794 USA

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Dr. Lijun Wu

Dr. Lijun Wu

Brookhaven National Laboratory, Upton, NY, 11973 USA

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Dr. David C. Bock

Dr. David C. Bock

Brookhaven National Laboratory, Upton, NY, 11973 USA

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Prof. Yimei Zhu

Prof. Yimei Zhu

Brookhaven National Laboratory, Upton, NY, 11973 USA

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Prof. Amy C. Marschilok

Corresponding Author

Prof. Amy C. Marschilok

Department of Chemistry, Stony Brook University, Stony Brook, NY, 11794 USA

Department of Materials Science and Engineering, Stony Brook University, Stony Brook, NY, 11794 USA

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Prof. Kenneth J. Takeuchi

Corresponding Author

Prof. Kenneth J. Takeuchi

Department of Chemistry, Stony Brook University, Stony Brook, NY, 11794 USA

Department of Materials Science and Engineering, Stony Brook University, Stony Brook, NY, 11794 USA

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Prof. Esther S. Takeuchi

Corresponding Author

Prof. Esther S. Takeuchi

Brookhaven National Laboratory, Upton, NY, 11973 USA

Department of Chemistry, Stony Brook University, Stony Brook, NY, 11794 USA

Department of Materials Science and Engineering, Stony Brook University, Stony Brook, NY, 11794 USA

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First published: 20 May 2016
Citations: 18

Abstract

This work minimizes the passive components of electrodes and moves toward bridging the gap between actual and theoretical battery gravimetric energy density. Binder-free self-supporting (BFSS) cathodes were prepared from redox-active, high aspect ratio, potassium α-MnO2 nanofibers (K-OMS-2) by eliminating the binder and current collector. The electroactive and structural element, K-OMS-2, was prepared by using a scalable, moderate temperature, aqueous synthesis. The BFFS electrode approach allows fabrication of thick, high energy density electrodes with low impedance, with up to 10-fold improvement in delivered specific energy relative to conventional cathodes. This could enable the design of high-capacity large form factor cells, as required for applications demanding high energy content. In principle, this approach suggests a widely applicable paradigm for the construction of other BFFS electrodes through the targeted synthesis of other transition-metal oxides with high aspect, fibrous morphologies.

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