TY - JOUR
T1 - Electrophoretic deposition of lithium iron phosphate cathode for thin-film 3D-microbatteries
AU - Mazor, H.
AU - Golodnitsky, D.
AU - Burstein, L.
AU - Gladkich, A.
AU - Peled, E.
PY - 2012/1/15
Y1 - 2012/1/15
N2 - 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.
AB - 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.
KW - Advanced cathode materials
KW - Electrophoretic deposition
KW - Li-ion microbattery
KW - Lithium iron phosphate
UR - http://www.scopus.com/inward/record.url?scp=80755163214&partnerID=8YFLogxK
U2 - 10.1016/j.jpowsour.2011.09.108
DO - 10.1016/j.jpowsour.2011.09.108
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AN - SCOPUS:80755163214
SN - 0378-7753
VL - 198
SP - 264
EP - 272
JO - Journal of Power Sources
JF - Journal of Power Sources
ER -
