Composite polymer electrolyte with three-dimensional ion transport channels constructed by NaCl template for solid-state lithium metal batteries

In order to meet the challenges brought by the low ionic conductivity of solid-state electrolytes (SSEs) and the growth of lithium dendrites in all-solid-state lithium metal batteries (ASSLMBs), the composite polymer electrolytes (CPEs) constructed by the combination of three-dimensional (3D) porous ceramics framework and polymers have been widely studied. However, there are still many challenges to preparation of 3D high-strength porous ceramics framework by a simple way. Here, we designed a 3D interconnected porous Li1.3Al0.3Ti1.7(PO4)3 (LATP) framework using NaCl as the template, which not only provides the fast transport channels for Li+ but also serves as a physical barrier to suppress the growth of Li dendrites. Benefiting from the enhanced mechanical and ionic conductivity of the 3D interconnected porous LATP framework, Li/Li symmetric cells based on the prepared CPE can cycle over 1000 h at 0.2 mA cm−2, 0.2 mAh cm−2 and 2000 h at 0.1 mA cm−2, 0.1 mAh cm−2. Moreover, all-solid-state LFP/Li with this 3D CPE demonstrates long-term stability cycles at 1 C.