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Water based processing of LiFePO 4/C cathode material for Li-ion batteries utilizing freeze granulation
RISE, Swerea, Swerea IVF.
RISE, Swerea, Swerea IVF.
RISE, Swerea, Swerea IVF.
RISE, Swerea, Swerea IVF.
2012 (English)In: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 213, 119-127 p.Article in journal (Refereed)
Abstract [en]

A water based solid state synthesis of LiFePO 4 has been conducted by utilizing freeze granulation. Various processing conditions were tested and achieved powder properties were characterized by density, XRD, specific surface area, carbon content, conductivity and SEM. Freeze granulation, a novel method for precursor preparation was shown to be an effective method to provide high degree of homogeneity prior to calcination and high ultimate yield of pure LiFePO 4. Cathodes were manufactured by water based as well as NMP system based tape casting. A commercial LiFePO 4/C powder was also characterized and used to manufacture cathodes as comparison in this study. Charge cycling tests showed promising results with high capacity and long term stability, well in the range of what the commercial powder provided. Post-milling of calcined powder prior to paste preparation for tape casting tended, however, to retard the capacity owing to disturbed carbon distribution and loss of conductivity of the LiFePO 4/C. In comparison with the solvent system for cathode manufacturing, the water based system gave similar cell performance, illustrating the possibility to apply a more environmentally sustainable processing of Li-battery cells. © 2012 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2012. Vol. 213, 119-127 p.
Keyword [en]
Aqueous processing, Freeze granulation, Li-ion batteries, LiFePO 4, Synthesis
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-13343DOI: 10.1016/j.jpowsour.2012.04.037Scopus ID: 2-s2.0-84860822265OAI: oai:DiVA.org:ri-13343DiVA: diva2:973549
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

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CiteExportLink to record
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