High-Performance\nCopolymerized Polycarbonate-Based\nSolid Electrolytes for Lithium Metal Batteries

Polycarbonate-based solid electrolytes exhibit a high\ndielectric\nconstant and remarkable oxidation resistance; nervertheless, their\ndevelopment is constrained by low room-temperature ionic conductivity\nand poor electrode compatibility. To overcome these challenges, a\nsolid polymer electrolyte (PVT) was designed containing carbonate\nand fluorinated side chain structures through an in situ copolymerization\nstrategy. This structure not only enhances lithium salt dissociation\nand ion migration but also forms a stable LiF interface on the lithium\nmetal anode. The PVT electrolyte demonstratesa high ionic conductivity\nof 1.71 × 10<sup>–4</sup> S cm<sup>–1</sup> at\n30 °C, surpassing that of PVE electrolyte (without F-containing\nchain segments, 1.23 × 10<sup>–4</sup> S cm<sup>–1</sup>). The Li|PVT|Li cell can cycle for more than 1200 h at 0.1 mA cm<sup>–2</sup>-0.1 mAh cm<sup>–2</sup>, while the Li|PVE|Li\ncell operates for only 1000 h. Moreover, the capacity retention rate\nof Li|PVT|LFP cells remains above 80% after 200 cycles at 25 °C\nand 0.1C.