A foaming process to prepare porous polymer membrane for lithium ion batteries

Li, Z. H.; Cheng, Chih-Ming; Zhan, X.Y.; Wu, Yingxu; Zhou, Xiao‐Dong

doi:10.1016/j.electacta.2009.03.016

Cited by 43 publications

(17 citation statements)

References 27 publications

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“…After complete evaporation of acetone and water, the resulting opaque membranes were dried at 70 °C for 30 min and stored in high vacuum (10 −5 mbar) at ambient temperature overnight. The porosity ( Φ ) of the membranes was determined according to Equation (1):28, 29 …”

Section: Methodsmentioning

confidence: 99%

Study of Carbamate‐Modified Disiloxane in Porous PVDF‐HFP Membranes: New Electrolytes/Separators for Lithium‐Ion Batteries

Jeschke

Mutke

Jiang³

et al. 2014

ChemPhysChem

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A gel electrolyte membrane is obtained through the absorption of a carbamate-modified liquid disiloxane-containing lithium bis(trifluoromethane)sulfonimide (LiTFSI) by using macroporous poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) membranes. The porous membranes are prepared by means of a phase inversion technique. The resulting gel electrolyte membrane is studied by using differential scanning calorimetry, Fourier-transform infrared (FTIR) spectroscopy, and microscope mapping through coherent anti-Stokes Raman scattering (CARS) confocal microscopy and impedance spectroscopy. The ionic conductivity of the gel electrolyte is 10(-4) S cm(-1) at 20 °C. FTIR spectroscopy reveals interactions between LiTFSI and the carbonyl moiety of the disiloxane. No interactions between LiTFSI and PVDF-HFP or between disiloxane and PVDF-HFP are detected by FTIR spectroscopy. Furthermore, the distribution of the α and β/γ phases of PVDF-HFP and the homogeneous distribution of disiloxane/LiTFSI in the gel electrolyte membranes are examined by FTIR mapping. CARS confocal microscopy is used to image the three-dimensional interconnectivity, which reveals a reticulated structure of macrovoids in the porous PVDF-HFP framework. Owing to properties such as electrochemical and thermal stability of the disiloxane-based liquid electrolyte and the mechanical stability of the porous PVDF-HFP membrane, the gel electrolyte membranes presented herein are promising candidates for applications as electrolytes/separators in lithium-ion batteries.

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Section: Methodsmentioning

confidence: 99%

Study of Carbamate‐Modified Disiloxane in Porous PVDF‐HFP Membranes: New Electrolytes/Separators for Lithium‐Ion Batteries

Jeschke

Mutke

Jiang³

et al. 2014

ChemPhysChem

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“…The resistance of the bulk electrolyte was obtained from the intercept of the straight line on the real axis. The ionic conductivity of the PVDF-HFP polymer electrolyte membrane is 1.03 mS cm −1 at room temperature which is higher than the Celgard 2400 separator saturated with electrolyte (0.60 mS cm −1 ), and increases with a rising temperature4041. Such high ionic conductivity should be ascribed to the high porosity of the polymer membrane.…”

Section: Resultsmentioning

confidence: 85%

Honeycomb-like porous gel polymer electrolyte membrane for lithium ion batteries with enhanced safety

Zhang

Sun

Huang

et al. 2014

Sci Rep

197

118

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Lithium ion batteries have shown great potential in applications as power sources for electric vehicles and large-scale energy storage. However, the direct uses of flammable organic liquid electrolyte with commercial separator induce serious safety problems including the risk of fire and explosion. Herein, we report the development of poly(vinylidene difluoride-co-hexafluoropropylene) polymer membranes with multi-sized honeycomb-like porous architectures. The as-prepared polymer electrolyte membranes contain porosity as high as 78%, which leads to the high electrolyte uptake of 86.2 wt%. The PVDF-HFP gel polymer electrolyte membranes exhibited a high ionic conductivity of 1.03 mS cm−1 at room temperature, which is much higher than that of commercial polymer membranes. Moreover, the as-obtained gel polymer membranes are also thermally stable up to 350°C and non-combustible in fire (fire-proof). When applied in lithium ion batteries with LiFePO4 as cathode materials, the gel polymer electrolyte demonstrated excellent electrochemical performances. This investigation indicates that PVDF-HFP gel polymer membranes could be potentially applicable for high power lithium ion batteries with the features of high safety, low cost and good performance.

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“…Preparing porous PVDF membrane is an available way to obtain gel polymer electrolyte as the pores can accommodate a large amount of liquid electrolyte [15,16]. Therefore, more attention has been devoted to increasing the liquid electrolyte content in the polymer matrix by controlling the porous structure by using a physical foaming agent [17]. For gel polymer electrolyte, the polymer membrane was prepared via phase-separation method and activated by immersing it in a liquid electrolyte and leaving it in an anhydrous environment until being gelled [18,19] and then, subjected to further characterizations [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Ionic liquid based PVDF/PMMA gel polymer electrolyte for lithium rechargeable battery

Yusoff¹,

dris²

2017

J. MECH. ENG. SCI.

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A foaming process to prepare porous polymer membrane for lithium ion batteries

Cited by 43 publications

References 27 publications

Study of Carbamate‐Modified Disiloxane in Porous PVDF‐HFP Membranes: New Electrolytes/Separators for Lithium‐Ion Batteries

Study of Carbamate‐Modified Disiloxane in Porous PVDF‐HFP Membranes: New Electrolytes/Separators for Lithium‐Ion Batteries

Honeycomb-like porous gel polymer electrolyte membrane for lithium ion batteries with enhanced safety

Ionic liquid based PVDF/PMMA gel polymer electrolyte for lithium rechargeable battery

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