Electrochemical and physical properties of poly(acrylonitrile)/poly(vinyl acetate)-based gel electrolytes for lithium ion batteries

Amaral, Fábio Augusto do; Dalmolin, Carla; Canobre, Sheila Cristina; Bocchi, Nerilso; Rocha‐Filho, Romeu C.; Biaggio, Sonia R.

doi:10.1016/j.jpowsour.2006.10.049

Cited by 64 publications

(33 citation statements)

References 39 publications

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“…was observed, indicating a decrease in the diffusion process, as expected. The observed voltammetric profile was consistent with those reported in others works [16,19,43].…”

Section: Electrochemical Stability Windowsupporting

confidence: 92%

“…PAN/PVA copolymer without lithium salt has a glass transition at about 65°C, considering that the T g of PAN is about 90°C [32]. In previous work, we reported that, when plasticizers are added, PAN/PVA-based gel electrolytes present much lower T g (around -90°C), indicating that the polymer is amorphous at room temperature [19]. In our current work, from the DSC curves obtained, it can be verified that the SPE thin film obtained by phase inversion in a non-solvent has a phase transition, which could be attributed to the T g , similar that obtained for the polymer gel, indicating no stiffening of the polymer chain.…”

Section: Thermal Characterization By Dscmentioning

confidence: 86%

“…. These gels showed high ionic conductivity values (in the range of 10 -3 S cm -1 at room temperature), but without mechanical resistance [19]. In this work, we intend to increase the mechanical resistance of the polymer films and to study the influence of the amount of lithium salt on the mechanical, thermal, structural, and electrochemical properties of these thin films.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of the porous solid polymer electrolyte of PAN/PVA by phase inversion

et al. 2015

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Porous solid polymer electrolytes (SPE) were prepared in the form of thin films by phase inversion by direct immersion in non-solvent acetone or methanol, using a copolymer of polyacrylonitrile and poly (vinyl acetate) in ethylene carbonate/dimethylene carbonate (EC/DMC 1:1 v/v) as plasticizer, which contained different LiClO 4 percentages. SEM images revealed pores on a micrometer scale (average diameter around 2 lm) distributed inside and on the surface of the films. XRD patterns revealed a predominantly amorphous behavior, favorable to the ionic conduction process. Thin films presented low glass transition temperatures (T g ), between -67 and -58°C. Thin films showed a thermal stability higher than those obtained for the gels. Thin films (average thickness of 22 lm) showed ionic conductivity around 10 -10 S cm -1 and 10 -7 S cm -1 by immersion in acetone and methanol, respectively. The porous thin films when were swollen in liquid electrolyte, the maximum ionic conductivity value reached was of 2.5 9 10 -4 S cm -1 with 10 % LiClO 4 at 25°C. The oxidation of the SPE only occurred around 4.5 V for the gel and 4.8 V versus Li/Li ? for the SPE thin film, thus resulting in a wide electrochemical stability. A stable passive layer at the interface between the polymer electrolyte and lithium metal was formed within the first 10 h and maintained during 4 weeks. The cell containing LiCoO 2 in thin-film electrolyte presented the one wellknown plateaux for the Li-ion intercalation in the 4 V region.Keywords Solid polymer electrolyte Á Lithium-ion batteries Á Thin films Á Phase inversion Á Polyacrylonitrile and poly (vinyl acetate)

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“…was observed, indicating a decrease in the diffusion process, as expected. The observed voltammetric profile was consistent with those reported in others works [16,19,43].…”

Section: Electrochemical Stability Windowsupporting

confidence: 92%

Section: Thermal Characterization By Dscmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of the porous solid polymer electrolyte of PAN/PVA by phase inversion

et al. 2015

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“…From the cyclic voltammogram of the MGE presented in Fig. 9, a pair of cathodic and anodic peaks, appearing at around 0 V, corresponds to the lithium redox processes [40]. Meanwhile, it is not found the reaction peak of -CN groups in PAN with lithium metal.…”

Section: Electrochemical Stability Of Mge (S 2 )mentioning

confidence: 93%

Preparation and characterization of a special structural poly(acrylonitrile)-based microporous membrane for lithium-ion batteries

Huai

Gao

Deng

et al. 2010

Ionics

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In this work, a special structural poly(acrylonitrile) (PAN)-based microporous membrane for lithium-ion batteries is prepared from PAN emulsion by simple casting and extracting techniques. It is found that the microporous membrane is fabricated by PAN particles with uniform size (about 580 nm), and a lot of micropores exist among the particles. The Gurley number of the microporous membrane obviously depends on the amount of additive but the porosity does not. The PAN-based microporous membrane is activated by non-aqueous liquid electrolyte to form microporous gel electrolyte (MGE), and its ionic conductivity increases with the decrease of the Gurley number. The resulting MGE shows typical thermal shut-down action because of the swellingincorporating behaviors of PAN-based particles by the help of the solvent of liquid electrolyte at high temperature. In addition, the electrochemical stability window of the MGE can extend to 5.5 V vs. Li + /Li. The test cell using MGE as separator shows high initial discharge capacity (143 mAh g -1 based on LiCoO 2 ) and high capacity retention ratio (around 94.8% at the 50th cycle). Generally, the special structural microporous membrane is promisingly used to prepare highsafety lithium-ion batteries.

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“…The interactions of Li + -ion and nitrile groups of PAN in the matrix were confirmed by FTIR analysis. The ionic conductivity and FTIR studies were carried out on PAN based gel electrolytes with EC: PC and EC: DMC mixtures as plasticizers, LiClO 4 or LiBF 4 as the salt by Amaral et al [Amaral et al, 2007]. The high ionic conductivity (1.47x10 -3 Scm -1 ) was estimated for 20:28:45:7 molar ratio of PAN-PVA: EC: DMC: LiBF 4 system.…”

Section: Pan Based Polymer Electrolytesmentioning

confidence: 99%

Surface Analysis Studies on Polymer Electrolyte Membranes Using Scanning Electron Microscope and Atomic Force Microscope

Ulaganathan¹,

Nithya²,

Rajendran³

2012

Scanning Electron Microscopy

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Electrochemical and physical properties of poly(acrylonitrile)/poly(vinyl acetate)-based gel electrolytes for lithium ion batteries

Cited by 64 publications

References 39 publications

Preparation and characterization of the porous solid polymer electrolyte of PAN/PVA by phase inversion

Preparation and characterization of the porous solid polymer electrolyte of PAN/PVA by phase inversion

Preparation and characterization of a special structural poly(acrylonitrile)-based microporous membrane for lithium-ion batteries

Surface Analysis Studies on Polymer Electrolyte Membranes Using Scanning Electron Microscope and Atomic Force Microscope

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