Plasma-modified polypropylene membranes as separators in high-power alkaline batteries

Ciszewski, Aleksander; Gancarz, Irena; Kunicki, Jerzy; Bryjak, Marek

doi:10.1016/j.surfcoat.2006.08.146

Cited by 40 publications

(32 citation statements)

References 47 publications

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“…Often, insufficient surface properties preclude its use in an application to which bulk mechanical properties may be well-suited. For example dyeability, printability, paintability, adhesion, biocompatibility, antifogging, and gas permeability of PP parts can be improved by surface modification [2][3][4][5][6][7][8][9]. Efforts have been made to develop polymer modifications processes which allow the surface properties to be tailored to meet a specific requirement while retaining beneficial mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Poly(acrylic acid) surface grafted polypropylene films: Near surface and bulk mechanical response

Fasce¹,

Costamagna²,

Pettarín³

et al. 2008

Express Polym. Lett.

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Abstract. Radical photo-grafting polymerization constitutes a promising technique for introducing functional groups onto surfaces of polypropylene films. According to their final use, surface grafting should be done without affecting overall mechanical properties. In this work the tensile drawing, fracture and biaxial impact response of biaxially oriented polypropylene commercial films grafted with poly(acrylic acid) (PAA) were investigated in terms of film orientation and surface modification. The variations of surface roughness, elastic modulus, hardness and resistance to permanent deformation induced by the chemical treatment were assessed by depth sensing indentation. As a consequence of chemical modification the optical, transport and wettability properties of the films were successfully varied. The introduced chains generated a PAA-grafted layer, which is stiffer and harder than the neat polypropylene surface. Regardless of the surface changes, it was proven that this kind of grafting procedure does not detriment bulk mechanical properties of the PP film.

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Section: Introductionmentioning

confidence: 99%

Poly(acrylic acid) surface grafted polypropylene films: Near surface and bulk mechanical response

Fasce¹,

Costamagna²,

Pettarín³

et al. 2008

Express Polym. Lett.

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“…Modifications of the polyolefin surface can improve the wetting characteristics of the separators but the chemistry is rather challenging and the performance depends critically on the nature and the grafting density of the functional groups. [8][9][10][11][12][13][14][15] To that end, graft polymerization of methylmethacrylate, glycidyl methacrylate, acrylic acid onto polyolefin separators has been described. [9][10][11][12][13] Oftentimes, radiation treatment (plasma, corona discharge, electron beam, g-ray, UV, photons) is applied to activate the polyolefin surface and to facilitate subsequent functionalization.…”

mentioning

confidence: 99%

“…[9][10][11][12][13] Oftentimes, radiation treatment (plasma, corona discharge, electron beam, g-ray, UV, photons) is applied to activate the polyolefin surface and to facilitate subsequent functionalization. [9][10][11][12][13][14] Alternatively, incorporation of inorganic nanoparticles including SiO 2 , TiO 2 , Al 2 O 3 , MgO, g-LiAlO 2 , and CaCO 3 into various polymers is also a well-studied route to improve the performance of battery separators. [16][17][18][19][20] The nanoparticles can be either dispersed in the polymer matrix to form a composite membrane, or can be initially combined with a suitable binder material and then deposited on a nonwoven support.…”

mentioning

confidence: 99%

Nanoparticle-coated separators for lithium-ion batteries with advanced electrochemical performance

Fang

Kelarakis

Lin

et al. 2011

Phys. Chem. Chem. Phys.

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We report a simple, scalable approach to improve the interfacial characteristics and, thereby, the performance of commonly used polyolefin based battery separators. The nanoparticle-coated separators are synthesized by first plasma treating the membrane in oxygen to create surface anchoring groups followed by immersion into a dispersion of positively charged SiO 2 nanoparticles. The process leads to nanoparticles electrostatically adsorbed not only onto the exterior of the surface but also inside the pores of the membrane. The thickness and depth of the coatings can be fine-tuned by controlling the f-potential of the nanoparticles. The membranes show improved wetting to common battery electrolytes such as propylene carbonate. Cells based on the nanoparticle-coated membranes are operable even in a simple mixture of EC/PC. In contrast, an identical cell based on the pristine, untreated membrane fails to be charged even after addition of a surfactant to improve electrolyte wetting. When evaluated in a Li-ion cell using an EC/PC/DEC/VC electrolyte mixture, the nanoparticle-coated separator retains 92% of its charge capacity after 100 cycles compared to 80 and 77% for the plasma only treated and pristine membrane, respectively.The rapid emergence and popularity of portable electronics has motivated extensive research efforts to meet the ever increasing demands for mobile power sources in terms of energy storage capacity, form factor, weight, and lifetime with minimal safety risk and environmental impact. Currently, Li-ion rechargeable batteries are the benchmark of this technology and are the subject of intense research and development.1-3 Certain operational limitations of the Li-ion batteries are directly or indirectly related to the performance characteristics of the separator that is a key component of each electrochemical converter. 4 The separator is essentially a diaphragm, whose function is to prevent physical and electrical contact between the electrodes, while allowing ionic current flow. [5][6][7] Ideally, the separators for Li-ion batteries should be porous and thin but mechanically robust. In addition, they should exhibit chemical and dimensional stability, low thermal shrinkage, and good wetting to common liquid electrolytes. Microporous membranes based on polyethylene (PE) or polypropylene (PP), their blends, their copolymers and their laminates have found widespread application as separators for Li-ion batteries, since they adequately fulfill most of the requirements presented above. The main drawback of the polyolefin separators is their poor wetting to cyclic electrolytes with high dielectric constant such as ethylene carbonate (EC) and propylene carbonate (PC), an effect that results in increased internal resistance of the cells. Modifications of the polyolefin surface can improve the wetting characteristics of the separators but the chemistry is rather challenging and the performance depends critically on the nature and the grafting density of the functional groups. [8][9][10][11][12][13][14][15] ...

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“…Ciszewski et al [55,56] reported the plasma-induced graft polymerization of poly(acrylic acid) (PAA) under UV irradiation using commercial PP microporous membranes for nickel-cadmium (Ni-Cd) battery. In their approach, depicted schematically in Figure 3, PP membranes were modified by argon plasma treatment to create grafting sites, followed UV irradiation to covalently-bond acrylic acid to the surface of PP membranes.…”

Section: Plasma Treatment Techniquesmentioning

confidence: 99%

Surface-Modified Membrane as A Separator for Lithium-Ion Polymer Battery

2010

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This paper describes the fabrication of novel modified polyethylene (PE) membranes using plasma technology to create high-performance and cost-effective separator membranes for practical applications in lithium-ion polymer batteries. The modified PE membrane via plasma modification process plays a critical role in improving wettability and electrolyte retention, interfacial adhesion between separators and electrodes, and cycle performance of lithium-ion polymer batteries. This paper suggests that the performance of lithium-ion polymer batteries can be greatly enhanced by the plasma modification of commercial separators with proper functional materials for targeted application.

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Plasma-modified polypropylene membranes as separators in high-power alkaline batteries

Cited by 40 publications

References 47 publications

Poly(acrylic acid) surface grafted polypropylene films: Near surface and bulk mechanical response

Poly(acrylic acid) surface grafted polypropylene films: Near surface and bulk mechanical response

Nanoparticle-coated separators for lithium-ion batteries with advanced electrochemical performance

Surface-Modified Membrane as A Separator for Lithium-Ion Polymer Battery

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