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Journal of Applied Electrochemistry

, Volume 36, Issue 11, pp 1291–1295 | Cite as

Purification process for an inorganic rechargeable lithium battery and new safety concepts

  • L. Zinck
  • M. Borck
  • C. Ripp
  • G. HambitzerEmail author
Article

Abstract

We have investigated an inorganic lithium battery system in which LiCoO2 is used as the positive electrode and lithium, intercalated into graphite, serves as negative electrode. The conducting salt is lithium tetrachloroaluminate (LiAlCl4). The electrolyte is based on SO2. It has been shown that a layer of lithium hydroxide is present on the surface of the lithium cobalt oxide. This has a negative impact on the stability of the electrode. To improve stability, we have developed a purification process for removing the lithium hydroxide from the surface of the positive electrode. After purification the cells show no significant change in either capacity or internal resistance when cycled. Up to 70% of the theoretical capacity of electrodes which have been purified in this way can be used without any negative effects being observed. To prevent the deposition of metallic lithium leading to a hazardous situation, a new safety concept was developed whereby local short circuits are allowable. Safe functioning of the new concept has been demonstrated with tests on complete cells.

Keywords

inorganic lithium battery system lithium hydroxide lithium cobalt dioxide purification process new safety concept 

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Notes

Acknowledgments

We thank “Zentrum für Sonnenenergie und Wasserstoff-Forschung (ZSW), Ulm, Baden-Württemberg, Germany”, who carried out some of the measurements.

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Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  1. 1.Fortu PowerCell GmbHKarlsruheGermany

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