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Solid-state electrolytes for Li-ion batteries are attracting growing interestas they allow building safer batteries, also using lithium metal anodes. Herewe studied a compound in the lithium superionic conductor (LISICON) family,i.e. Li4-xGe1-xPxO4 (LGPO). Thin films were deposited via pulsed laserdeposition and their electrical properties were compared with ceramic pellets.A detailed characterization of the micro structure shows that thin films can bedeposited fully crystalline at higher temperatures but also partially amorphousat room temperature. The conductivity is not strongly influenced by thepresence of grain boundaries, exposure to air or lithium deficiencies.First-principles molecular dynamics simulations were employed to calculate thelithium ion diffusion profile and the conductivity at various temperatures ofthe ideal LGPO crystal. Simulations gives the upper limit of conductivity for adefect free crystal, which is in the range of 10-2 S cm-1 at 300 deg. The easeof thin film fabrication, the room-temperature Li-ion conductivity in the rangeof a few microS cm-1 make LGPO a very appealing electrolyte material for thinfilm all-solid-state all-oxide microbatteries.

Li4-xGe1-xPxO4 a potential solid-state electrolyte for all-oxide microbatteries