Electrolytes based on nano-2D interlayer structure of Al-pillared clays for solid-state lithium battery

摘要

As we all know, solid-state batteries (SSBs) which can effectively inhibit lithium dendrites have disadvantages such as low conductivity and poor cycling performance, and the preparation process of their solid electrolyte is complex and costly, which makes it difficult to meet the requirements of commercialization. Therefore, this paper proposes a strategy to prepare a new solid electrolytes (Li-IL@Al-PILC solid electrolyte) using the nano-2D interlayer structure of Al-pillared clay (Al-PILC) as Li~+ channel through an impregnation method. This Li-IL@ Al-PILC SSE at 15% Li-IL has many advantages, such as high conductivity (2.13 × 10~(-3) S/cm at 25 °C), good thermal stability (up to 450 °C), extremely wide electrochemical window (up to 5.5 V) and low cost. At the same time, the assembled battery exhibits good cycling performance, with capacities of 120 mAh/g after 1000 cycles at 0.5C for LiFePO_4 and good compatibility with the electrode. Due to its good mechanical hardness and nano-2D interlayer interface, Li-IL @ Al-PILC SSE has a certain ability to inhibit the growth of lithium dendrites. Through the above results, it can indicate that Li-IL @ Al-PILC SSE owns a good prospect for lithium metal batteries.