Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7019634 | Journal of Membrane Science | 2018 | 32 Pages |
Abstract
The grafted polymer modified by ionic bond was synthesized by a simple and scalable method based on sulfonated polystyrene (SPS) and the monoamine-terminated PEO derivative (M2070). Porous polymer electrolytes (PPEs) containing the grafted polymer and poly(vinylidene fluoride) (PVDF) were prepared by phase inversion process. The dense pores distributed in the polymer matrix, which could store liquid electrolyte and provide enough channels for ionic conduction, and the ionic conductivity of PPEs was thus improved effectively. Furthermore, the effect of the mass fraction of grafted polymer on porosity, electrolyte uptake, and ionic conductivity was investigated. The PPE membrane with 30â¯wt% grafted polymer (PPE-3) exhibited the better pore distribution and superior electrolyte uptake compared with pure PVDF membrane, which resulted in the remarkable ionic conductivity (3.05â¯Ãâ¯10â3 Sâ¯cmâ1) of the corresponding PPE-3 at 30â¯Â°C. The contact angle of PPE-3 (14.9°) decreased significantly owing to the good affinity of grafted polymer with electrolyte. The LiFePO4/PPE-3/Li cell showed a stable charge/discharge performance with initial discharge capacity of 141â¯mAâ¯hâ¯gâ1 at room temperature and 96% capacity retention after 130 cycles. Those results suggest that PPEs containing the grafted polymer via ionic band can be promising electrolyte candidates for high-performance lithium ion batteries.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Filtration and Separation
Authors
Mengke Guo, Binghua Zhou, Ji Hu, Jirong Wang, Dan He, Xiaolin Xie, Zhigang Xue,