Safety assessment of polyolefin and nonwoven separators used in lithium-ion batteries

Wang, Yuanxun Ethan; Chiu, Chao-Hung; Chou, Po-Heng

doi:10.1016/j.jpowsour.2020.228148

Cited by 60 publications

(28 citation statements)

References 14 publications

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“…The electrolyte had a composition of 1.1 M LiPF 6 (Formosa Plastics Corporation). The separators used in this study were (1)…”

Section: Battery Informationmentioning

confidence: 99%

“…For example, ISC can be triggered by internal causations such as lithium dendrite, particles penetration, or external abusive scenarios. [1][2][3][4][5] Researchers concluded that the failure mechanism directly links to the melting and collapse of the separator, and the separator plays an important role in the further evolution of thermal runaway. [6][7][8][9] However, studies into the influence of the separator in an overcharge test are relatively few.…”

Section: Introductionmentioning

confidence: 99%

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Structure and morphological changes of multilayer separators for lithium‐ion batteries under abuse/overcharge conditions

Yeh

Huang²,

Wu³

et al. 2021

J of Applied Polymer Sci

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Most separators for lithium-ion (Li-ion) batteries are manufactured using polyolefins. However, such thermoplastic materials may undergo structural changes under high voltage or temperature. Thus, this study investigates the structural and morphological changes of separators during overcharge conditions. Unlike a single-layer polypropylene (PP) separator, a composite separator with an interface, such as a PP/polyethylene (PE)/PP separator, exhibits a characteristic peak in voltage during the overcharging process before the occurrence of the shutdown mechanism by the PE layer. As the temperature rises, parts of the irregular crystalline structure of PE melt because of their lower melting temperature at the PP/PE interface. This results in local shrinkage and interfaces disturbance, and the Li-ion channel becomes partially blocked. The Li-ions follow alternative channels, and this causes the voltage to abruptly increase during overcharging. The experimental results clearly indicate that the microstructural changes of the separator are important in the above-mentioned phenomenon.

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“…The electrolyte had a composition of 1.1 M LiPF 6 (Formosa Plastics Corporation). The separators used in this study were (1)…”

Section: Battery Informationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structure and morphological changes of multilayer separators for lithium‐ion batteries under abuse/overcharge conditions

Yeh

Huang²,

Wu³

et al. 2021

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…The fundamental cause of safety is the internal heat generation in LIBs, [ 2 ] which comprises ofreversible reaction heat, irreversible heat, and heat production of side reactions. [ 3,4 ] The reversible reaction heat comes from the electrochemical reaction during charging/discharging processes, which is related to the entropy change of the materials.…”

Section: Introductionmentioning

confidence: 99%

Safer Lithium‐Ion Batteries from the Separator Aspect: Development and Future Perspectives

Liu

Jiang

et al. 2020

Energy & Environ Materials

158

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With the rapid development of lithium‐ion batteries (LIBs), safety problems are the great obstacles that restrict large‐scale applications of LIBs, especially for the high‐energy‐density electric vehicle industry. Developing component materials (e.g., cathode, anode, electrolyte, and separator) with high thermal stability and intrinsic safety is the ultimate solution to improve the safety of LIBs. Separators are crucial components that do not directly participate in electrochemical reactions during charging/discharging processes, but play a vital role in determining the electrochemical performance and safety of LIBs. In this review, the recent advances on traditional separators modified with ceramic materials and multifunctional separators ranging from the prevention of the thermal runaway to the flame retardant are summarized. The component–structure–performance relationship of separators and their effect on the comprehensive performance of LIBs are discussed in detail. Furthermore, the research challenges and future directions toward the advancement in separators for high‐safety LIBs are also proposed.

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“…Lithium-ion batteries (LIBs) are the most competitive power source for large-scale battery applications due to their prominent cycle life, high specific energy density and slow charge loss. [1][2][3][4][5][6][7] In order to meet the demand of ampliative market, the performance of all lithium-ion battery components including the electrodes, electrolyte and separator needs to be further improved. [8,9] The key function of the separator in LIBs is to isolate the direct contact of anode and cathode.…”

Section: Introductionmentioning

confidence: 99%

Low‐Cost and Heat‐Resistant Poly(catechol/polyamine)‐Silica Composite Membrane for High‐Performance Lithium‐Ion Batteries

et al. 2021

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A composite membrane based on SiO 2 and a low-cost poly (catechol/polyamine) (PCPA) multicomponent system was prepared by using a simple dip-coating processes. The results indicate that the formation of an inorganic/organic composite coating on the surface of the polyethylene (PE) separator is beneficial for improving the comprehensive performance, especially for the thermal stability and wettability. Compared to the PE separator, the thermal stability of the PE@SiO 2 -PCPA composite membrane is greatly improved, showing a higher decomposition temperature (426°C) and a smaller heat shrinkage rate at 160°C. Moreover, the Li/LiCoO 2 battery assembled with the PE@SiO 2 -PCPA composite membrane shows an excellent initial discharge capacity and a remarkable capacity retention (171.5 mAh g À 1 , 86.1 %) at 4.4 V after 200 cycles at 0.5 C, which much higher than the PE membrane (165.2 mAh g À 1 , 61.4 %). This study provides a potential application for membranes with low cost, high thermal stability, and good wettability in the field of lithium-ion batteries.

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Safety assessment of polyolefin and nonwoven separators used in lithium-ion batteries

Cited by 60 publications

References 14 publications

Structure and morphological changes of multilayer separators for lithium‐ion batteries under abuse/overcharge conditions

Structure and morphological changes of multilayer separators for lithium‐ion batteries under abuse/overcharge conditions

Safer Lithium‐Ion Batteries from the Separator Aspect: Development and Future Perspectives

Low‐Cost and Heat‐Resistant Poly(catechol/polyamine)‐Silica Composite Membrane for High‐Performance Lithium‐Ion Batteries

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