The
low ionic conductivity and mechanical strength are important
factors impeding the application of solid polymer electrolytes. Herein,
we design synthesize an organic/inorganic hybrid star-shaped polymer
of octa(poly(methyl methacrylate)–poly(poly(ethylene glycol)
methyl ether methacrylate) cage oligomeric silsesquioxanes (POSS–(PMMA–PPEGMEM)8) by one-step free atom transfer radical polymerization (ATRP),
and compound with Li6.4La3Zr1.4Ta0.6O12 (LLZTO) to prepare a composite polymer electrolyte
membrane (LP-CPEM). The star-shaped structure of the POSS–(PMMA–PPEGMEM)8 induced by octachloropropyl polyhedral cage oligomeric silsesquioxane
(OCP-POSS) is beneficial to reduce the crystallinity of polymer and
increase the movement of the polymer chain to form a continuous interconnected
ion migration channel. The LLZTO fillers in the LP-CPEM could simultaneously
hinder the orderly arrangement of polymer chains and provide other
ion transport paths to increase the ion conductivity of LP-CPEM. The
LP-CPEM with 7.5 wt % LLZTO has higher ionic conductivity of 3.8 ×
10–4 S cm–1 at 30 °C and
high mechanical strength (5.2 MPa). Additionally, Li/Li symmetric
cells demonstrate stable constant current charging/discharging during
1000 h at 0.1 mA cm–2, and the all-solid-state batteries
fabricated by the LP-CPEM exhibit good cyclic stability. It is promising
for the development of next-generation high-safety all-solid-state
lithium metal batteries.
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