Electrophoretic deposition of lithium iron phosphate cathode for thin-film 3D-microbatteries

H. Mazor*, D. Golodnitsky, L. Burstein, A. Gladkich, E. Peled

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


An electrophoretic deposition (EPD) method has been developed for the first time to prepare thin-film LiFePO4 cathodes. The effects of polymers and surface-active additives in the electrolytic bath, voltage and deposition protocol have been studied with the aim of obtaining highly adhesive, compact pristine LiFePO4 and polymer-LiFePO4 composite films to be utilized in planar and three-dimensional microbatteries. The samples were investigated by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), XPS and TOFSIMS. These methods confirmed the presence of a polymer binder and its homogeneous lateral distribution in the composite EPD-LiFePO4 cathode. Li/LiFePO4 semi-3D concentric microbatteries (3DCMB) on perforated silicon substrates showed a peak-pulse-power capability of 175 mW cm?2 and stable electrochemical behavior for over 200 cycles at 100% DOD. Coating the LiFePO4 with a thin layer of copper sulfide improved the cell performance even more. The 3D-LiFePO4-CuS-coated batteries are capable of delivering peak pulse power greater than 200 mW cm?2 and an energy density of 6-10 mWh cm?2 - adequate for the needs of microsystems.

Original languageEnglish
Pages (from-to)264-272
Number of pages9
JournalJournal of Power Sources
StatePublished - 15 Jan 2012


  • Advanced cathode materials
  • Electrophoretic deposition
  • Li-ion microbattery
  • Lithium iron phosphate


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