Boehmite-coated microporous membrane for enhanced electrochemical performance and dimensional stability of lithium-ion batteries

Xu, Ruijie; Lin, Xiaogui; Xiaorui, Huang; Xie, Jianhe; Cao, Jing; Lei, Caihong

doi:10.1007/s10008-017-3780-3

Cited by 23 publications

(13 citation statements)

References 30 publications

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“…These cavities can accelerate the breakage of materials which in turn shorten useful life of polymeric products. However, producing cavities is demanded in some special fields, for instance, manufacturing microporous membranes for separation process and polymer‐electret materials . Understanding the nucleation mechanism of cavities is the basis to control the appearance of cavities in polymers, especially for creating commercial products.…”

Section: Application Of Cavities In Semi‐crystalline Polymersmentioning

confidence: 99%

Cavitation‐Induced Stress Whitening in Semi‐Crystalline Polymers

Men

2018

Macro Materials & Eng

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Cavitation‐induced stress whitening in semi‐crystalline polymers during stretching significantly influences the physical properties of the materials. This review summarizes studies focusing on two different cavitation processes triggered at small and large strain regimes. The corresponding mechanisms of these two cavitation processes are discussed. For cavitation activated at small strain, there are two basic but distinctly different models with the initiation of cavities either in the amorphous phase or in the crystalline skeleton. For the cavitation triggered at a large strain regime, there are also two different arguments being either due to the defects located in the ends of micro‐fibrils or as a consequence of the fragmentation of load‐bearing inter‐fibril/micro‐fibril tie chains in highly oriented amorphous networks. A unified understanding of the cavitation processes during stretching semi‐crystalline polymers based on interpenetrated network model is proposed. Finally, this review outlooks future research topics for better understanding the cavitation mechanism to meet the industrial need.

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Section: Application Of Cavities In Semi‐crystalline Polymersmentioning

confidence: 99%

Cavitation‐Induced Stress Whitening in Semi‐Crystalline Polymers

Men

2018

Macro Materials & Eng

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“…The similar LSVs of the bare PE and the PE-PVDF separators indicate that the PVDF organic coating layer has no negative impact on the electrochemical stability of LIBs. The oxidation peak of the PE-PVDF separator appears at a slightly lower potential but is smoother than the PE separator; this means the PVDF-PE has a wider working window [28] and the PE-PVDF separator is very suitable for application in LIBs [18].…”

Section: Resultsmentioning

confidence: 99%

Application of PVDF Organic Particles Coating on Polyethylene Separator for Lithium Ion Batteries

et al. 2019

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Surface coating modification on a polyethylene separator serves as a promising way to meet the high requirements of thermal dimensional stability and excellent electrolyte wettability for lithium ion batteries (LIBs). In this paper, we report a new type of surface modified separator by coating polyvinylidene fluoride (PVDF) organic particles on traditional microporous polyethylene (PE) separators. The PE separator coated by PVDF particles (PE-PVDF separator) has higher porosity (61.4%), better electrolyte wettability (the contact angle to water was 3.28° ± 0.21°) and superior ionic conductivity (1.53 mS/cm) compared with the bare PE separator (51.2%, 111.3° ± 0.12°, 0.55 mS/cm). On one hand, the PVDF organic polymer has excellent organic electrolyte compatibility. On the other hand, the PVDF particles contain sub-micro spheres, of which the separator can possess a large specific surface area to absorb additional electrolyte. As a result, LIBs assembled using the PE-PVDF separator showed better electrochemical performances. For example, the button cell using a PE-PVDF as the separator had a higher capacity retention rate (70.01% capacity retention after 200 cycles at 0.5 C) than the bare PE separator (62.5% capacity retention after 200 cycles at 0.5 C). Moreover, the rate capability of LIBs was greatly improved as well—especially at larger current densities such as 2 C and 5 C.

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“…For example, Yang et al 34 fabricated a boehmite coated PE separator with interlocking interface structure that enhanced the thermal stability and wettability. Xu et al 35 prepared boehmite coated PP separators with different sizes of boehmite, and these separators possessed superior dimensional stability and excellent electrochemical performance. Zhong et al 36 fabricated an AlOOH-coated polyimide electrospun brous membrane that exhibited superior electrolyte electrochemical stability and high ionic conductivity (2.18 mS cm À1 ).…”

Section: Introductionmentioning

confidence: 99%