Fabrication of a novel sandwich-like composite separator with enhanced physical and electrochemical performances for lithium-ion battery

Wu, Dazhao; He, Jinlin; Zhang, Mingzu; Ni, Peihong; Li, Xiaofei; Hu, Jiankang

doi:10.1016/j.jpowsour.2015.04.182

Cited by 40 publications

(15 citation statements)

References 45 publications

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“…However, the PVdF/PE/PVdF separator developed in this study shows a thickness of only ∼20 μm, which is much lower than that of the reported electrospun separators. As compared to similar works on the layered separators − summarized in Figure , our PVdF/PE/PVdF separator shows the lowest thickness, the high ionic conductivity, and the largest electrolyte uptake reported to date. Such desirable features can be ascribed to its highly porous microstructure and the incorporation of SiO 2 NPs in the polymer membrane.…”

Section: Resultssupporting

confidence: 45%

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Ultrathin and Strong Electrospun Porous Fiber Separator

Pan

Zhang

et al. 2018

ACS Appl. Energy Mater.

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An ideal separator of lithium-ion battery (LIB) should have a zero ionic resistance. Low ionic resistance (high ionic conductivity) will greatly help to realize very fast ion diffusion and superhigh rate capability of LIBs. The most effective technique to achieve low ionic resistance of separator is to reduce its thickness or increase its porosity. Paradoxically, the low thickness and high porosity will inevitably decrease the mechanical strength of separators. Inspired by the hierarchical structures of abalone shell, we demonstrate in this work an ultrathin silica-anchored layered (PVdF/PE/PVdF) porous fiber separator prepared via electrospinning. The separator displays both ultrathin thickness (∼20 μm thick) and high mechanical strength of ∼11.2 MPa, as well as high porosity, which results in high electrolyte uptake (∼380%) and ionic conductivity (∼2.5 mS cm–1). When such thin separator was deployed in a LiFePO4/Li cell, and the cell can deliver an initial discharge capacity of 134.3 mA h g–1 at a high rate of 10 C and maintain a capacity of 129.2 mA h g–1 after 300 charge–discharge cycles, showing excellent high-rate performance. More interestingly, this study demonstrates a pathway for the development of ultrathin and high-mechanical-strength electrospun separators for high-rate Li-ion batteries.

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Section: Resultssupporting

confidence: 45%

“…Comparison of the ultrathin SiO 2 -anchored PVdF/PE/PVdF porous separator with other similar separators − in terms of their thickness, electrolyte uptake, and ionic conductivity.…”

Section: Resultsmentioning

confidence: 99%

Ultrathin and Strong Electrospun Porous Fiber Separator

Pan

Zhang

et al. 2018

ACS Appl. Energy Mater.

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“…The better cycling performance of the L-PANs (1 : 9, 3 : 7 by weight) was attributed to the increases of electrolyte uptake and conductivity of lithium ions, which provided easier path for ionic transport and better electrolyte retention. 33 During the cell cycle process, the capacity attenuation was due to active material dissolution, electrolyte decomposition and the formation of resistive layers on electrodes, leading to polarization between electrolyte-electrode interface. 9,34,35…”

Section: Cycling Performancementioning

confidence: 99%

An electrospun lignin/polyacrylonitrile nonwoven composite separator with high porosity and thermal stability for lithium-ion batteries

et al. 2015

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“…The separator was immersed in a mixed solution of ethylene carbonate and diethyl carbonate with a volume ratio of 1:1 for 6 h. Then the sample was taken out; the electrolyte solvent remaining on the surface was removed with filter paper. The dry and immersed separators were weighed and the weight ratio of electrolyte uptake ( W up ) was then determined using the following formula: 43 , 44

W_{up} = \frac{W_{0} - W}{W}

where W and W 0 are the weight of the dry and immersed separator, respectively. The separator adequately infiltrated by electrolyte was compressed to a specific pressure.…”

Section: Methodsmentioning

confidence: 99%

The unusual delamination phenomenon of three kinds of lithium‐ion battery separators

Ding

Zhang

et al. 2020

Polymer International

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An unusual delamination phenomenon on three kinds of lithium‐ion battery separators was investigated in this study, which is closely associated with the compression resistance of the separator. The delamination trends of three kinds of polymer separators were analyzed systematically. Scanning electron microscopy, two‐dimensional wide‐angle X‐ray diffraction, compression and delamination tests show that a separator prepared by the dry process with uniaxial stretching delaminate hardest due to abundant connection or support structure along the thickness direction. However, the multilayer structure stacked along the thickness direction can be seen clearly for separators experiencing biaxial stretching, both for the dry process and wet process. In particular, a separator prepared by the wet process has the poorest connection or support structure along the thickness direction, leading to the strongest delamination trend and the worst compression resistance. Based on this, we control the delamination trend of the separator by adjusting the condensed structure of the precursor film. Besides, the delamination test can quantify the delamination trend of different kinds of separators accurately and further supplement the evaluation criteria of lithium‐ion battery separators, which can help us to better understand and design a separator with optimal microporous structure. © 2020 Society of Industrial Chemistry

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Fabrication of a novel sandwich-like composite separator with enhanced physical and electrochemical performances for lithium-ion battery

Cited by 40 publications

References 45 publications

Ultrathin and Strong Electrospun Porous Fiber Separator

Ultrathin and Strong Electrospun Porous Fiber Separator

An electrospun lignin/polyacrylonitrile nonwoven composite separator with high porosity and thermal stability for lithium-ion batteries

The unusual delamination phenomenon of three kinds of lithium‐ion battery separators

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