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In situ polymerization of 1,3-dioxolane (DOL) based liquid precursor as gel polymer electrolyte (GPE) is a promising strategy to prepare solid-state lithium metal batteries. However, the poor structural stability and low lithium ion transference number (tLi+) of the linear poly(1,3-dioxolane) (PDOL) GPE limit its commercial application. Herein, a cross-linked GPE is prepared by lithium salt initiated in situ thermal polymerization of DOL and glycerol triglycidyl ether (GTE) monomers. A fluoroethylene carbonate (FEC) liquid plasticizer is further introduced to promote the dissociation of lithium salts, and the obtained PDOL–FEC–GTE composite electrolyte exhibits ionic conductivity of 2.1 × 10−4 S cm−1, tLi+ of 0.58 and wide electrochemical stability window of 5.1 V. Li‖Li symmetric cell is stably operated for 790 h at 1.0 mA cm−2 and 1.0 mA h cm−2. LiFePO4‖PDOL–FEC–GTE‖Li full cell delivers a discharge specific capacity of 120.8 mA h g−1 after 200 cycles at a current rate of 1C with a capacity retention of 84.1%. This work provides new ideas for accelerating the practical application of solid-state lithium metal batteries. [ABSTRACT FROM AUTHOR]

We report an electron-insulating layer of Li2O nanoparticles passivating a Li-rich Li–Cu–Zn ternary alloy as an advanced Li anode. The insulating layer ensures Li deposition below the top protective layer and inhibits side reactions effectively. Additionally, the ternary alloy framework offers superior lithiophilicity and robust mechanical stability. Galvanostatic measurements demonstrate a prolonged lifespan of symmetric cells for over 1200 h at 1 mA cm−2 and 1 mA h cm−2. [ABSTRACT FROM AUTHOR]