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

Benjamin Starke, Stefan Seidlmayer, Oleksandr Dolotko, Ralph Gilles and Karl-Heinz Pettinger
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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

Energies, 2017, vol. 10, issue 12, 1-15

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.

Keywords: lithium ion battery; LiFeMnPO 4; ageing; water-based processing; sustainable battery production (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
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