Abstract
The garnet-type electrolytes are promising for solid-state lithium-metal batteries, while it is still challenging to realize fast lithium-ion conduction with moderate sintering process. To solve the problem, we proposed a novel cerium (Ce)-based cubic garnet electrolyte – Li6.25La3Ce1.25Ta0.75O12 (LLCTO-0.75). The Ta5+ doping of the tetragonal Li7La3Ce2O12 (LLCO) results in a stable cubic phase at room temperature, whilst the presence of Ce4+ is associated with enlarging lattice parameters to facilitate lithium-ion migration and promoting sintering. As a result, the LLCTO-0.75 achieves a dense ceramic microstructure with only 30 min sintering at 1150 °C, and an outstanding lithium-ion conductivity of 1.09 mS cm−1 at 30 °C. Benefiting from a small Li/LLCTO-0.75 interfacial resistance of 52.8 Ω cm2 at 30 °C, the Li-Li symmetric cell cycles for over 700 h without short circuit, and the quasi-solid state LiFePO4/LLCTO 0.75/Li battery delivers a satisfying specific capacity of 127.0 mAh g−1 after 300 cycles. This work provides new insights into the development of practical solid-state oxide electrolytes for safe high-energy batteries.
Published Version
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