Robust polyimide nanofibrous membrane with porous-layer-coated morphology by <i>in situ</i> self-bonding and micro-crosslinking for lithium-ion battery separator

Sun, Guohua; Dong, Guoqing; Kong, Lushi; Hou, Yudong; Tian, Guofeng; Qi, Shengli; Wu, Dezhen

doi:10.1039/c8nr07548d

Cited by 56 publications

(36 citation statements)

References 48 publications

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“…The ionic conductivity values of P-L10, P-L30, and P-L50 are 1.4 mS/cm, 1.7 mS/cm, and 0.89 mS/cm, respectively. The enhanced electrolyte uptake and porosity of the P-L30 membrane improves its ionic conductivity above all the other PL membranes [57,58]. The improved ionic conductivity of P-L30 membrane is further corroborated through the cyclic voltammetry measurements (Figure S5), in which the difference between the anodic and cathodic peak is found to be the lowest when using the P-L30 membrane (i.e., 293 mV), indicating high lithium ion transportation in the P-L30 case.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Highly Porous PAN-LATP Membranes as Separators for Lithium Ion Batteries

et al. 2019

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Separators are a vital component to ensure the safety of lithium-ion batteries. However, the commercial separators employed in lithium ion batteries are inefficient due to their low porosity. In the present study, a simple electrospinning technique is adopted to prepare highly porous polyacrylonitrile (PAN)-based membranes with a higher concentration of lithium aluminum titanium phosphate (LATP) ceramic particles, as a viable alternative to the commercialized separators used in lithium ion batteries. The effect of the LATP particles on the morphology of the porous membranes is demonstrated through Field emission scattering electron microscopy. X-ray diffraction and Fourier transform infrared spectra studies suitably demonstrate the mixing of PAN and LATP particles in the polymer matrix. PAN with 30 wt% LATP (P-L30) exhibits an enhanced porosity of 90% and is more thermally stable, with the highest electrolyte uptake among all the prepared membranes. Due to better electrolyte uptake, the P-L30 membrane demonstrates an improved ionic conductivity of 1.7 mS/cm. A coin cell prepared with a P-L30 membrane and a LiFePO4 cathode demonstrates the highest discharge capacity of 158 mAh/g at 0.5C rate. The coin cell with the P-L30 membrane also displays good cycling stability by retaining 87% of the initial discharge capacity after 200 cycles of charging and discharging at 0.5C rate.

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Section: Resultsmentioning

confidence: 99%

Preparation of Highly Porous PAN-LATP Membranes as Separators for Lithium Ion Batteries

et al. 2019

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“…Their random arrangement stacking with a thickness of 260 μm generated an open porous structure with a pore size of around 1.2 μm which was about 28 times bigger than that (0.043 μm) of the typical battery separator based on polypropylene (PP), i.e., Celgard 2400. In addition to the thermal stability as high as 550 °C (vs. ~90 °C for Celgard 2400), much higher than the thermal imidization temperature of PI, GF featured much higher electrolyte permeability than the Celgard membrane, which made it an ideal model separator (or substrate) to investigate the effect of the surface functional group, i.e., PI, on polysulfide shuttling without disturbance of physical trapping in the internal pore structure [26,28].…”

Section: Resultsmentioning

confidence: 99%

Polyimide-Coated Glass Microfiber as Polysulfide Perm-Selective Separator for High-Performance Lithium-Sulphur Batteries

et al. 2019

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Although numerous research efforts have been made for the last two decades, the chronic problems of lithium-sulphur batteries (LSBs), i.e., polysulfide shuttling of active sulphur material and surface passivation of the lithium metal anode, still impede their practical application. In order to mitigate these issues, we utilized polyimide functionalized glass microfibers (PI-GF) as a functional separator. The water-soluble precursor enabled the formation of a homogenous thin coating on the surface of the glass microfiber (GF) membrane with the potential to scale and fine-tune: the PI-GF was prepared by simple dipping of commercial GF into an aqueous solution of poly(amic acid), (PAA), followed by thermal imidization. We found that a tiny amount of polyimide (PI) of 0.5 wt.% is more than enough to endow the GF separator with useful capabilities, both retarding polysulfide migration. Combined with a free-standing microporous carbon cloth-sulphur composite cathode, the PI-GF-based LSB cell exhibits a stable cycling over 120 cycles at a current density of 1 mA/cm2 and an areal sulphur loading of 2 mgS/cm2 with only a marginal capacity loss of 0.099%/cycle. This corresponds to an improvement in cycle stability by 200%, specific capacity by 16.4%, and capacity loss per cycle by 45% as compared to those of the cell without PI coating. Our study revealed that a simple but synergistic combination of porous carbon supporting material and functional separator enabled us to achieve high-performance LSBs, but could also pave the way for the development of practical LSBs using the commercially viable method without using complicated synthesis or harmful and expensive chemicals.

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“…It is straightforward to make electrospun composite nanofibers by directly dispersing nanoscale fillers in spin dope. Many PI composite nanofibers have been prepared by directly adding nanofillers or precursors into PAA solutions for electrospinning followed by thermal imidization [89,90]. Cheng et al reported the fabrication of PI/silica hybrid nanofibrous mats/fabrics by combining electrospinning and in-situ sol-gel synthesis [91].…”

Section: Pi/ceramic Compositesmentioning

confidence: 99%

Polyimide separators for rechargeable batteries

Sui

Miao

et al. 2021

Journal of Energy Chemistry

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Robust polyimide nanofibrous membrane with porous-layer-coated morphology by in situ self-bonding and micro-crosslinking for lithium-ion battery separator

Abstract: A novel polyimide nanofibrous membrane with porous-layer-coated morphology has been successfully fabricated by an in situ self-bonding and micro-crosslinking technique.

Cited by 56 publications

References 48 publications

Preparation of Highly Porous PAN-LATP Membranes as Separators for Lithium Ion Batteries

Preparation of Highly Porous PAN-LATP Membranes as Separators for Lithium Ion Batteries

Polyimide-Coated Glass Microfiber as Polysulfide Perm-Selective Separator for High-Performance Lithium-Sulphur Batteries

Polyimide separators for rechargeable batteries

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