PVDF/PMMA brushes membrane for lithium‐ion rechargeable batteries prepared via preirradiation grafting technique

Abstract

Poly(methyl methacrylate) (PMMA) was anchored to multiporous poly(vinylidine fluoride) (PVDF) surface via electron beam preirradiation grafting technique to prepare PVDF/PMMA brushes. The conformation of the PVDF/PMMA brushes was verified through Attenuated total reflection‐Fourier transform infra red spectroscopy (ATR‐FTIR), energy dispersive X‐ray spectroscopy (EDX), and scanning electron microscopy (SEM). Thermal stability of PVDF/PMMA brushes was characterized by thermo gravimetric analysis (TGA). The degradation of PVDF/PMMA brushes showed a two‐step pattern. PVDF/PMMA brushes membrane could be used as polymer electrolyte in lithium‐ion rechargeable batteries after it was activated by uptaking 1 M LiPF6/EC‐DMC (ethylene carbonate/dimethyl carbonate; EC:DMC = 1:1 by volume) electrolyte solution. The activated membrane showed high ionic conductivity, 6.1 × 10−3 S cm−1 at room temperature, and a good electrochemical stability up to 5.0 V. The excellent performances of multiporous PVDF‐g‐PMMA membranes suggest that they are suitable for application in high‐performance lithium‐ion batteries. © 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 751–758, 2008

Microporous gel polymer electrolytes for lithium rechargeable battery application

“…Therefore, the addition of PMMA not only controls the porosity, but also is correlated with the liquid electrolyte uptake of the film, resulting in high ionic conductivity of the membrane. The characteristic peaks observed are common to both pure PVDF and pure PMMA membranes [40][41][42]. From Fig 3(a), the vibrational band at 1406 cm -1 corresponds to CH 2 wagging deformation of pure PVDF membrane.…”

“…3, it can be clearly seen that the intensity of this peak gradually decreases, while the peak is slightly shifted to 1734 cm -1 in the PVDF/PMMA blend membrane. This result suggests that there is a specific interaction between the carbonyl groups of PMMA and the CH 2 groups of PVDF, and indicates the formation of a PVDF/PMMA blended membrane [41,42]. Table 2.…”

Preparation and electrochemical performance of gel polymer electrolytes with a novel star network

“…, which originated from the complex effect of the carbonyl group and the low motion of polymer chain segment. Up to date, many attempts have been done to improve the ionic conductivity of PMMA-salt systems, such as modification of the composition of PMMA-salt systems by the addition of nanoparticles [9][10][11][12][13], modification of the structure of PMMA system by blending them with other polymers [14][15][16], copolymers [17][18][19]. A series of star polymers with new topology have been synthesized with the development of polymeric technology, such as ATRP.…”

Poly(vinylidene fluoride) and Poly(ethyl 2‐cyanoacrylate) Blends through Controlled Polymerization of Ethyl 2‐Cyanoacrylates

“…It is widely used in many industrial applications such as ultrafiltration and microfiltration, [1][2][3][4] lithium ion batteries, [5] and organic/inorganic or all-organic electromechanical composites. [6,7] In addition, PVDF is biocompatible, which extends its promise to the medical field.…”