Abstract
The low crystallinity poly(vinylidene fluoride)/tetraethyl orthosilicate silane (PVDF/TEOS) composite separator with a finger-like pore structure for lithium-ion battery has been successfully prepared by non-solvent-induced phase separation (NIPS) technique. The PVDF/TEOS composite separator shows the excellent wettability and electrolyte retention properties compared with Celgard 2320 separator. AC impedance spectroscopy results indicate that the novel PVDF/TEOS composite separator has ion conductivity of 1.22 mS cm−1 at 25 °C, higher than that of Celgard 2320 separator (0.88 mS cm−1). The lithium-ion transference number of PVDF composite separator added 0.7% TEOS was 0.481, better than that of Celgard 2400 (0.332). What is more, the lithium-ion batteries assembled with PVDF/TEOS composite separator show good cycling performance and rate capability.
Highlights
Scientists and engineers have long believed in the promise of batteries to change the world
The morphology of porous poly(vinylidene fluoride) (PVDF) separator prepared by nonsolvent-induced phase separation technique has a different pore structure with different thickness
According to Eq (1), the calculated ionic conductivity of Celgard 2320, pristine PVDF, and PVDF/tetraethyl orthosilicate silane (TEOS) composite separator are 0.88, 1.17, 1.22 mS cm−1, respectively, integrated with the thickness of the membrane shown in Table 1 and the area of the blocking electrode
Summary
Scientists and engineers have long believed in the promise of batteries to change the world. PVDF/Celgard 2320 composite separator with a novel finger-like pore structure has been prepared by non-solvent-induced phase separation (NIPS) method. Preparation of PVDF/TEOS composite separator conical flask with continuously stirring.
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