Aluminum doping has been conducted for Li4SiO4-Li3PO4 solid solution (LSP).
The Al-doped LSP (LASP) has much higher ionic conductivity than the undoped LSP.
The ionic conductivity of LASP increases as the amount of dopant is increased.
LASP has higher ionic conductivity and lower electron transport number.
LASP appears to be a better solid electrolyte than LSP due to the above features.