本發(fā)明公開了一種以高嶺土為原料的固體鋰離子電解質(zhì),特點(diǎn)是化學(xué)通式為L(zhǎng)i1+2(x1+x2)+2(y1+y2+y3+y4)Alx1Mgy1Fey2Ky3Nay4M2-(x1+x2)-(y1+y2+y3+y4)Six2P3-(x1+x2)O12,其中,M為Ti、Ge或Zr,0.1≤x1≤-0.5,0.1≤x2≤0.5,0.01≤y1≤0.1,0.01≤y2≤0.1,0.008≤y3≤0.05,0.008≤y4≤0.05,制備方法包括以下步驟:將高嶺土在置于管式爐中煅燒后研磨,然后與MO2、NH4H2PO4和Li2CO3按一定質(zhì)量比混合,加入乙醇溶液球磨一定時(shí)間,在真空烘箱中干燥,然后研磨,在壓力機(jī)下形成一定形狀的坯體,置于氮?dú)庵?高溫條件下,保持一定時(shí)間,得到固體鋰離子電解質(zhì),優(yōu)點(diǎn)是電導(dǎo)率高,并能大大降低生產(chǎn)成本。