Solid
composite electrolytes (SCEs) are regarded as an effective solution
to ensure safety and enhance the energy density of lithium-based batteries.
This work reports an ultrathin SCE membrane (∼ 15 μm)
based on Li6.4La3Zr1.4Ta0.6O12/PVDF-HFP/LiTFSI/succinonitrile; it not only possesses
good ionic conductivity (6.53 × 10–4 S cm–1 with a little amount of liquid electrolyte) at 30
°C and a satisfactory lithium ion transfer number (0.55 without
electrolyte), but also exhibits excellent thermal and mechanical properties.
A symmetric cell with SCE succinonitrile-10% (SN-10%) can be continuously
cycled without short circuit at 0.2 mA cm–2 for
about 340 h. Moreover, a high reversible discharge capacity of 150.2
mAh g–1 at 0.5 C was maintained by the cell (LiFePO4/SCE SN-10%/Li) after 269 cycles at room temperature. Notably,
a capacity of about 100 mAh g–1 at 5 C was also
obtained. This work might guide the improvement of future solid-state
lithium/sodium metal batteries and lithium–sulfur batteries,
even for wearable flexible batteries.
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