Dimension-Controlled Solid Electrolyte for All-Solid-State Batteries

摘要

Dimension-controlled solid electrolytes of 0D, 1D, and 2D are compared by a help of computational simulation in a view of what shape or size of solid electrolytes can lead better performance of all-solid-state electrode. First, the specific contact area and effective ionic conductivity within the all-solid-state electrode are estimated by building corresponding 3D electrode structures with a computer-aided design and analysis program. In the case of 0D, smaller size of solid electrolyte shows higher specific contact area and effective ionic conductivity. When controlling the shape of solid electrolyte from 0D to 1D, the effective ionic conductivity can go up by twenty times, but the specific contact area is reduced by one-third. On the contrary, both specific contact area and effective ionic conductivity of 2D decrease together due to its poor packing property, in other words, the electrode with 2D cannot be compressed like 0D or 1D. In a view of electrochemical performance on the electrochemical model, 1D shows the best areal capacity and rate capability owing to the enhanced effective ionic conductivity. Finally, blending dimension-controlled solid electrolytes and increasing the amount of active material are investigated to improve the electrochemical performance of the all-solid-state electrode.