A composite solid-state electrolyte (SSE) with acceptable
safety
and durability is considered as a potential candidate for high-performance
lithium–oxygen (Li–O2) batteries. Herein,
to address the safety issues and improve the electrochemical performance
of Li–O2 batteries, a solvent-free composite SSE
is prepared based on the thermal initiation of poly(ethylene glycol)
diacrylate radical polymerization, and an integrated battery is achieved
by injecting an electrolyte precursor between electrodes during the
assembly process through a simple heat treatment. The Li-metal symmetric
cells based on this composite SSE achieve a critical current density
of 0.8 mA cm–2 and a stable cycle life of over 900
h at a current density of 0.2 mA cm–2. This composite
SSE effectively inhibits the erosion of O2 on the Li metal
anode, optimizes the interface between the electrolyte and cathode,
and provides abundant reaction sites for the electrochemical reactions
during cycling. The integrated solid-state Li–O2 battery prepared in this work achieves stable long cycling (118
cycles) at a current density of 500 mA g–1 at room
temperature, showing the promising future application prospects.
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