Ionics

, Volume 24, Issue 4, pp 1001–1006 | Cite as

Compatibility study of oxide and olivine cathode materials with lithium aluminum titanium phosphate

  • Michael Gellert
  • Enkhetsetseg Dashjav
  • Daniel Grüner
  • Qianli Ma
  • Frank Tietz
Original Paper
First Online:
Received:
Revised:
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Abstract

The compatibility of the solid electrolyte Li1.5Al0.5Ti1.5(PO4)3 (LATP) with the cathode materials LiCoO2, LiMn2O4, LiCoPO4, LiFePO4, and LiMn0.5Fe0.5PO4 was investigated in a co-sintering study. Mixtures of LATP and the different cathode materials were sintered at various temperatures and subsequently analyzed by thermal analysis, X-ray diffraction, and electron microscopy. Oxide cathode materials display a rapid decomposition reaction with the electrolyte material even at temperatures as low as 500 °C, while olivine cathode materials are much more stable. The oxide cathode materials tend to decompose to lithium-free compounds, leaving lithium to form Li3PO4 and other metal phosphates. In contrast, the olivine cathode materials decompose to mixed phosphates, which can, in part, still be electrochemically active. Among the olivine cathode materials, LiFePO4 demonstrated the most promising results. No secondary phases were detected by X-ray diffraction after sintering a LATP/LiFePO4 mixture at temperatures as high as 700 °C. Electron microscopy revealed a small secondary phase probably consisting of Li2FeTi(PO4)3, which is ionically conductive and should be electrochemically active as well.

Keywords

Li-ion battery All-solid-state battery LATP Co-sintering Olivines 
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Notes

Acknowledgements

We thank M. T. Gerhards for the DTA/TG measurements. We also thank the German Federal Ministry of Education and Research (BMBF) for the financial support (reference numbers 03XP0047B and 03XP0026E).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

11581_2017_2276_MOESM1_ESM.pdf (94 kb)
ESM 1 (PDF 94 kb)

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Michael Gellert
    • 1
  • Enkhetsetseg Dashjav
    • 1
  • Daniel Grüner
    • 2
  • Qianli Ma
    • 1
  • Frank Tietz
    • 1
    • 3
  1. 1.Forschungszentrum Jülich GmbH, Institute of Energy and Climate ResearchMaterials Synthesis and Processing (IEK-1)JülichGermany
  2. 2.Forschungszentrum Jülich GmbH, Institute of Energy and Climate ResearchMicrostructure and Properties of Materials (IEK-2)JülichGermany
  3. 3.Helmholtz-Institute MünsterForschungszentrum Jülich GmbHJülichGermany

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