A Recyclable Inert Inorganic Framework Assisted Solid-State Electrolyte for Long-Life Aluminum Ion Batteries
Ke Guo, Wei Wang, Wei‐Li Song, Shijie Li, Xueyan Du, Shuqiang Jiao
Abstract
High Resolution Image Download MS PowerPoint Slide The environmentally friendly and high-safety aluminum-ion batteries (AIBs) have attracted intense interest, but the extensive use of expensive EMIC-AlCl 3 electrolyte, strong moisture sensitivity, and severe corrosion of the Al anode limit their commercial application. Herein, we develop a solid-state electrolyte (F-SSAF) with an AlF 3 inert inorganic framework as the solid diluent, EMIC-AlCl 3 as the electrolyte, and FEC@EMIC-AlCl 3 (FIL) as the interface additive for solid-state AIBs (SSAIBs). The dissociation of Al 2 Cl 7 – (AlCl 3 –AlCl 4 – ) into AlCl 4 – is promoted by AlF 3, which can facilitate the migration rate of AlCl 4 – active ions and simultaneously mitigate the corrosion of the Al anode. The introduction of an AlF 3 inert inorganic framework can also reduce the dosage of expensive EMIC-AlCl 3 and alleviate the moisture sensitivity of EMIC-AlCl 3 . The FIL is introduced into the surfaces of both anode and cathode, thus in situ forming F-rich SEI and CEI films. The F-SSAF enables Al|F-SSAF|Al symmetric cells to achieve ultralong stable deposition and dissolution of Al up to 4000 h, and Al|F-SSAF|C full cells to achieve an unprecedented long cycle life of 10000 cycles with an average Coulombic efficiency of >99%. In addition, up to 80% of the AlF 3 inert inorganic framework can be recycled. This work provides a simple yet substantial strategy for low-cost, long-life, and high-safety SSAIBs.