本发明公开了一种LiBH4‑LiI‑P2S5三元复合固态电解质及其制备方法，属于固态电解质材料设计与制备技术领域，所述复合固态电解质通过机械球磨法和退火法制备，本发明制备的LiBH4‑LiI‑P2S5复合电解质，在30 oC时离子电导率达到1×10‑4 S cm‑1，电化学窗口高达5 V。同时，本发明制备的复合固态电解质具有极好的对锂稳定性，在电流密度为0.2 mA cm‑2的恒流充放电测试中，循环了1000 h后依然能保持稳定运行。本发明制备过程工艺简单，可重复性强，对环境无污染，对设备要求不高，为LiBH4基的复合电解质在未来全固态电池商业化的应用提供了理论基础。
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