Publication: Photo-crosslinked lignin/PAN electrospun separator for safe lithium-ion batteries
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Date
2022-10-01
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Abstract
A novel crosslinked electrospun nanofbrous membrane with maleated lignin (ML) and
poly(acrylonitrile) (PAN) is presented as a separator for lithium-ion batteries (LIBs). Alkali lignin was
treated with an esterifcation agent of maleic anhydride, resulting in a substantial hydroxyl group
conversion to enhance the reactivity and mechanical properties of the fnal nanofber membranes. The
maleated lignin (ML) was subsequently mixed with UV-curable formulations (up to 30% wt) containing
polyethylene glycol diacrylate (PEGDA), hydrolyzed 3-(Trimethoxysilyl)propyl methacrylate (HMEMO)
as crosslinkers, and poly(acrylonitrile) (PAN) as a precursor polymer. UV-electrospinning was used
to fabricate PAN/ML/HMEMO/PEGDA (PMHP) crosslinked membranes. PMHP membranes made
of electrospun nanofbers feature a three-dimensional (3D) porous structure with interconnected
voids between the fbers. The mechanical strength of PMHP membranes with a thickness of 25 µm
was enhanced by the variation of the cross-linkable formulations. The cell assembled with PMHP2
membrane (20 wt% of ML) showed the maximum ionic conductivity value of 2.79*10−3 S cm−1, which
is signifcantly higher than that of the same cell with the liquid electrolyte and commercial Celgard
2400 (6.5*10−4 S cm−1). The enhanced LIB efciency with PMHP2 membrane can be attributed to its
high porosity, which allows better electrolyte uptake and demonstrates higher ionic conductivity. As
a result, the cell assembled with LiFePO4 cathode, Li metal anode, and PMHP2 membrane had a high
initial discharge specifc capacity of 147 mAh g−1 at 0.1 C and exhibited outstanding rate performance.
Also, it efectively limits the formation of Li dendrites over 1000 h. PMHP separators have improved
chemical and physical properties, including porosity, thermal, mechanical, and electrochemical
characteristics, compared with the commercial ones.
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Keywords
Temel Bilimler, Mühendislik ve Teknoloji, Natural Sciences, Engineering and Technology, Mühendislik, Bilişim ve Teknoloji (ENG), Temel Bilimler (SCI), Doğa Bilimleri Genel, ÇOK DİSİPLİNLİ BİLİMLER, Engineering, Computing & Technology (ENG), Natural Sciences (SCI), NATURAL SCIENCES, GENERAL, MULTIDISCIPLINARY SCIENCES, Multidisipliner, Multidisciplinary
Citation
Kahraman M. V. , "Photo-crosslinked lignin/PAN electrospun separator for safe lithium-ion batteries"", SCIENTIFIC REPORTS, cilt.12, sa.18272, ss.1-13, 2022