1 research outputs found
Method Using Water-Based Solvent to Prepare Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> Solid Electrolytes
Li-garnet Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> (LLZO) is a promising
candidate of solid electrolytes for high-safety
solid-state Li<sup>+</sup> ion batteries. However, because of its
high reactivity to water, the preparation of LLZO powders and ceramics
is not easy for large-scale amounts. Herein, a method applying water-based
solvent is proposed to demonstrate a possible solution. Ta-doped LLZO,
that is, Li<sub>6.4</sub>La<sub>3</sub>Zr<sub>1.4</sub>Ta<sub>0.6</sub>O<sub>12</sub> (LLZTO), and its LLZTO/MgO composite ceramics are
made by attrition milling, followed by a spray-drying process using
water-based slurries. The impacts of parameters of the method on the
structure and properties of green and sintered pellets are studied.
A relative density of ∼95%, a Li-ion conductivity of ∼3.5
× 10<sup>–4</sup> S/cm, and uniform grain size LLZTO/MgO
garnet composite ceramics are obtained with an attrition-milled LLZTO/MgO
slurry that contains 40 wt % solids and 2 wt % polyvinyl alcohol binder.
Li–sulfur batteries based on these ceramics are fabricated
and work under 25 °C for 20 cycles with a Coulombic efficiency
of 100%. This research demonstrates a promising mass production method
for the preparation of Li-garnet ceramics