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Ageing and Water-Based Processing of LiFeMnPO 4 Secondary Agglomerates and Its Effects on Electrochemical Characteristics

Author

Listed:
  • Benjamin Starke

    (Technology Center for Energy, University of Applied Sciences Landshut, Am Lurzenhof 1, 84036 Landshut, Germany)

  • Stefan Seidlmayer

    (Heinz Maier-Leibnitz Zentrum (MLZ), Technical University of Munich (TUM), 85748 Garching, Germany)

  • Oleksandr Dolotko

    (Heinz Maier-Leibnitz Zentrum (MLZ), Technical University of Munich (TUM), 85748 Garching, Germany)

  • Ralph Gilles

    (Heinz Maier-Leibnitz Zentrum (MLZ), Technical University of Munich (TUM), 85748 Garching, Germany)

  • Karl-Heinz Pettinger

    (Technology Center for Energy, University of Applied Sciences Landshut, Am Lurzenhof 1, 84036 Landshut, Germany)

Abstract

LiFeMnPO 4 secondary agglomerates have been aged under different temperature and moisture conditions. The aged and pristine powder samples were then processed to water- and solvent-based cathodes. Structural studies by means of neutron and X-ray diffraction revealed that neither ageing nor water-based processing significantly modified the crystal structure of LiFeMnPO 4 secondary agglomerates. Electrochemical characterization was carried out with full-cells. It was found that long-term cycling is similar independent of the solvent used for slurry preparation. Full-cells assembled with water-based cathodes show a better C-rate capability due to a more homogeneous distribution of cathode constituents compared to solvent-based ones. In no case was any negative effect of initial active material ageing on the electrochemical performance found. During ageing and processing, LiFeMnPO 4 is effectively protected by carbon coating and water can be completely removed by drying since it is only reversibly bound. This contribution shows that LiFeMnPO 4 secondary agglomerates allow simplified active material handling and have a high potential for sustainable water-based electrode manufacturing.

Suggested Citation

  • Benjamin Starke & Stefan Seidlmayer & Oleksandr Dolotko & Ralph Gilles & Karl-Heinz Pettinger, 2017. "Ageing and Water-Based Processing of LiFeMnPO 4 Secondary Agglomerates and Its Effects on Electrochemical Characteristics," Energies, MDPI, vol. 10(12), pages 1-15, December.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:12:p:2135-:d:123009
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