Enhanced the mechanical strength of polyimide (PI) nanofiber separator via PAALi binder for lithium ion battery

Li, Menglin; Lei, Sheng; Xu, Rong; Yang, Yang; Bai, Yaozong; Song, Shangjun; Liu, Gaojun; Wang, Tao; Huang, Xianli; He, Jie

doi:10.1016/j.coco.2020.100607

Cited by 43 publications

(22 citation statements)

References 24 publications

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“…The increasing concentration of the SiO2 sol affects the tensile strength of the membrane. Moreover, the addition of SiO2 improved the tensile strength and other mechanical properties of the prepared membranes, as previously reported 47,48) . The increasing tensile strength of the membrane is due to SiO2 inserting into the pores and causing the pore size to decrease, increasing the membrane's tightness and strength.…”

Section: Shrinkage Ratio [%]supporting

confidence: 83%

Highly Porous and Thermally Stable Poly(vinylidene fluoride) Separators : Effects of Solvent and Colloidal SiO_2 Concentration

Widiyandari¹,

Putra²,

Suryana³

et al. 2022

Evergreen

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Separator is an important part of lithium-ion batteries because it acts both as a physical barrier for the electrodes and as an electrolyte reservoir for ion transport. The separator has direct influence on the battery performance. Polyolefins, typical materials used for the fabrication of separator, demonstrate high flexibilities and mechanical strengths but also possess a high ratio of thermal shrinkage and low porosity. The aim of the research is to obtain highly porous and thermally stable separator. Poly(vinylidene fluoride) (PVDF) nanofiber membrane was synthesized via double jet electrospinning method. PVDF was dissolved in variations of solvents, i.e., dimethylformamideacetone and dimethylformamide-ethanol and added with colloidal SiO2 at different concentrations of 0 ppm, 1000 ppm, 3000 ppm, and 5000 ppm. The obtained separators exhibited high porosities, high electrolyte uptakes, and thermally stable, resulting in improved performances when assembled in real battery cell systems.

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Section: Shrinkage Ratio [%]supporting

confidence: 83%

Highly Porous and Thermally Stable Poly(vinylidene fluoride) Separators : Effects of Solvent and Colloidal SiO_2 Concentration

Widiyandari¹,

Putra²,

Suryana³

et al. 2022

Evergreen

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“…The better the affinity between the separator and the electrolyte, the more conducive to ion transmission. 38,41 Furthermore, when the testing liquid is deionized water, the contact angles of 18 wt%-HP, 21 wt%-HP, 24 wt%-HP, 27 wt%-HP, and PE are 129.86 , 123.95 , 108.62 , 126.41 , and 112.13 in Figure 5f-j, respectively, suggesting the hydrophobic property. In this case, it is well-known that a rough solid surface could enhance the hydrophobic property of these membranes.…”

Section: Resultsmentioning

confidence: 95%

“…[35][36][37] It is widely reported that the excessive shrinkage of separator will cause internal short circuit of lithium-ion battery and even lead to a safety hazard. [38][39][40] Figure 4a shows the flame retardant properties of 24 wt%-HP nanofiber membranes and PE separator. The PE separator starts burning quickly when just contact with the fire source.…”

Section: Resultsmentioning

confidence: 99%

Morphology optimizing of polyvinylidene fluoride (PVDF) nanofiber separator for safe lithium‐ion battery

Gao

Lei

Xie

et al. 2022

J of Applied Polymer Sci

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Commercial polyolefin separator cannot guarantee the safety of lithium-ion batteries at high temperatures due to their poor thermal stability. All kinds of nanofiber membranes with high thermal stability become the focus. In this paper, we have prepared PVDF nanofiber membrane by electrospinning method and have studied the relationship between the electrochemical performance and nanofiber morphology in detail. It is found that the morphology of PVDF is transformed from ball-like to various nanofiber with increasing the concentration of spinning solution. As a result, the PVDF nanofiber membrane (24 wt%-HP) prepared from spinning solution with the concentration of 24 wt% is composed of coarse nanofiber and fine nanofiber, which exhibits better electrochemical properties, such as cycling stability (300 cycles) and ionic conductivity (1.65 mS cm À1 ). LiCoO 2 /Li cells based on PVDF nanofiber separators have higher discharge capacity even at the current density of 5 C-rate, superior than the cells based on PE separator. It is inspiring for high-energy-density battery safety to use this PVDF nanofiber separator.

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“…Hence, there has been intensive efforts to increase research on flame-retardancy and thermal-stability polymeric separators for avoiding these issues. [9][10][11][12] Although the thermal performance of the LIBs has been improved to some extent, it has not fundamentally solved the safety concerns.…”

Section: Introductionmentioning

confidence: 99%

High‐Performance Polyimide Nanofiber Membrane for Progressive and Safe Lithium‐Ion Batteries Guarded by a Zirconia Armor Layer

Liu

Dong

et al. 2022

ChemElectroChem

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Innovative technologies for the fabrication of separators possessing outstanding properties like superior thermostability, mechanical strength, and ultrahigh flame resistance are imperative for advanced and safe energy storage systems (ESSs). Nevertheless, there are lots of limitations to attain the requirements mentioned above for classic polymeric separators. Herein, to achieve all these goals, we fabricate a zirconia nanoshell@polyimide core formed in situ (ZrO 2 @PI in situ) as a nanofabric membrane via an innovative and convenient strategy to be used as a novel high-performance flexible ceramic composite separator. Different from traditional ceramiccoated separators, the in situ ZrO 2 @PI composite separator possesses a shell-core structure obtained via an in situ absorption complexation and hydrolysis strategy, which endows ultrahigh flame resistance, superior wettability, thermostability, and excellent ionic conductivity. The NCM811 batteries installed with an in situ ZrO 2 @PI nanofabric separator displays the outstanding capacity of 159.0 mAh g À 1 at 5 C, far higher than the cells assembled with a PI separator (146.2 mAh g À 1 ) or Celgard-2400 separator (125.1 mAh g À 1 ) at the same 5 C. In addition, the cell manifests outstanding cycle performance, for which the capacity retention ratio is 89.4 % after 100 cycles at 1 C. All test results certify the ZrO 2 @PI composite separators formed in situ can be effectively applied in progressive and safe batteries.www.chemelectrochem.org

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Enhanced the mechanical strength of polyimide (PI) nanofiber separator via PAALi binder for lithium ion battery

Cited by 43 publications

References 24 publications

Highly Porous and Thermally Stable Poly(vinylidene fluoride) Separators : Effects of Solvent and Colloidal SiO_2 Concentration

Highly Porous and Thermally Stable Poly(vinylidene fluoride) Separators : Effects of Solvent and Colloidal SiO_2 Concentration

Morphology optimizing of polyvinylidene fluoride (PVDF) nanofiber separator for safe lithium‐ion battery

High‐Performance Polyimide Nanofiber Membrane for Progressive and Safe Lithium‐Ion Batteries Guarded by a Zirconia Armor Layer

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