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Sustainability 2017, 9(6), 888; doi:10.3390/su9060888

Influence of Particle Morphologies of LiFePO4 on Water- and Solvent-Based Processing and Electrochemical Properties

1
Technology Center for Energy, University of Applied Sciences Landshut, Am Lurzenhof 1, 84036 Landshut, Germany
2
Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, 85748 Garching, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Derek J. McPhee
Received: 24 April 2017 / Revised: 14 May 2017 / Accepted: 19 May 2017 / Published: 24 May 2017
(This article belongs to the Section Sustainable Chemistry)
View Full-Text   |   Download PDF [5057 KB, uploaded 24 May 2017]   |  

Abstract

LiFePO4 (LFP) primary particles and secondary agglomerates have been processed into water- and solvent-based cathodes. By means of neutron and X-ray diffraction it was found that no structural changes of LiFePO4 occurred upon water- and solvent-based slurry preparation. Electrochemical characterization was carried out with full-cells and a distinct influence of particle morphology was observable. Water-based processing of primary particles leads to deficits in electrochemical performance while secondary agglomerates are non-sensitive to water during processing. In the presence of water, high mechanical stress during slurry preparation causes a partial detachment of carbon coating. However, this effect is negligible for secondary agglomerates since only surface particles are exposed to mechanical stress. Due to longer diffusion paths and the fact that secondary agglomerates represent a micro-heterogeneity in the cathode, the C-rate capability of secondary agglomerates is slightly lower than that of primary particles. This paper demonstrates that for any high energy application with moderate C-rates, secondary agglomerates hold a great potential for environmentally friendly and cost-efficient water-based cathode production. View Full-Text
Keywords: lithium-ion battery; LiFePO4; ageing; water-based processing; sustainable battery manufacturing; morphology lithium-ion battery; LiFePO4; ageing; water-based processing; sustainable battery manufacturing; morphology
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MDPI and ACS Style

Starke, B.; Seidlmayer, S.; Jankowsky, S.; Dolotko, O.; Gilles, R.; Pettinger, K.-H. Influence of Particle Morphologies of LiFePO4 on Water- and Solvent-Based Processing and Electrochemical Properties. Sustainability 2017, 9, 888.

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