The
formation of lithium dendrites is suppressed using a Li1.5Al0.5Ge1.5(PO4)3–poly(ethylene
oxide) (LAGP-PEO) composite solid electrolyte and a PEO (lithium bis(trifluoromethane)sulfonimide)
[PEO (LiTFSI)]-modified lithium metal anode in all-solid-state lithium
batteries. The effects on the anode performance based on the PEO content
in the composite solid electrolyte and the molecular weight of PEO
used to modify the Li anode are studied. The structure, surface morphology,
and stability of the composite solid electrolyte are examined by X-ray
diffraction spectroscopy, scanning electron microscopy, and electrochemical
tests. Results show that the presence of a PEO-500000(LiTFSI) film
on a Li anode results in good mechanical properties and satisfactory
interface contact features. The film can also prevent Li from reacting
with LAGP. Furthermore, the formation of lithium dendrites can be
effectively inhibited as the composite solid electrolyte is combined
with the PEO film on the Li anode. The ratio of PEO in the composite
solid electrolyte can be reduced to a low level of 1 wt %. PEO remains
stable even at a high potential of 5.12 V (vs Li/Li+).
The assembled Li-PEO (LiTFSI)/LAGP-PEO/LiMn0.8Fe0.2PO4 all-solid-state cell can deliver an initial discharge
capacity of 160.8 mAh g–1 and exhibit good cycling
stability and rate performance at 50 °C.
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