Abstract
Powders of Li2MMn3O8 (M = Fe, Co) were prepared by glycine nitrate combustion from the corresponding metal nitrates. The reaction products were pressed into pellets with the addition of 20 wt.% excess LiNO3, which were used as targets for e-beam evaporation. A high-voltage all-solid-state thin-film lithium ion battery was demonstrated by the sequential deposition of spinel structured Li2MMn 3O8 (M = Co, Fe) as positive electrode by e-beam evaporation, LiPON as electrolyte, and metallic Al as negative electrode by sputtering in N2 and Ar gas mixtures with specific power and gas flow rates. A lithium ion conductivity of ∼10-6 S cm-1 was observed for the optimized thin-film LiPON electrolyte prepared under the condition of a chamber pressure of 2.6 × 10-2 mbar and a power of 60-100 W. The chemical diffusion coefficient (D̃) was found to be in the range 10-13 to 10-12 cm2 s-1 for any composition x of Li2-xMMn3O8 (M = Fe, Co) in the range from 0.1 to 1.6 by employing the galvanostatic intermittent titration technique (GITT). AC impedance studies revealed a charge transfer resistance of 260-290 Ω, a double layer capacity of ∼45-70 μF for an electrode area of 6.7 cm2.
Original language | English |
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Pages (from-to) | 232-238 |
Number of pages | 7 |
Journal | Journal of Power Sources |
Volume | 154 |
Issue number | 1 |
DOIs | |
Publication status | Published - 9 Mar 2006 |
Keywords
- All-solid-state batteries
- Chemical diffusion coefficient
- Li-ion batteries