Thermotolerant separator of cross-linked polyimide fibers with narrowed pore size for lithium-ion batteries

Wang, Yan; Guo, Minhao; Hui, Fu; Wu, Zhenzhong; Zhang, Yizhe; Chao, Guojie; Chen, Suli; Zhang, Longsheng; Liu, Tianxi

doi:10.1016/j.memsci.2022.121004

Cited by 32 publications

(9 citation statements)

References 41 publications

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“…According to the GN, the commercialized PE separator exhibited a value of 235.7 s/100 cc, meaning that it takes 235.7 s for air to permeate and traverse the separator. The PI separator showed a GN of 4.4 s/100 cc, indicating a far more rapid permeation due to the larger pores, which could potentially cause internal short circuits [45][46][47]. In contrast, the GN of the MPcoated PI separator was well controlled, showing a GN of 109.6 s/100 cc, which indicated that the inner pores of the PI separator were well-clogged.…”

Section: Resultsmentioning

confidence: 98%

Poly(Imide) Separator Functionalized by Melamine Phosphonic Acid for Regulating Structural and Thermal Stabilities of Lithium-ion Batteries

Jeon,

Park,

Yim

2024

J. Electrochem. Sci. Technol

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As the energy density of lithium-ion batteries (LIBs) continues to increase, various separators are being developed to with the aim of improving the safety performance. Although poly(imide) (PI)-based separators are widely used, it is difficult to control their pore size and distribution, and this may further increase the risk associated. Herein, a melamine phosphonic acid (MP)-coated PI separator that can effectively control the pore structure of the substrate is suggested as a remedy. After the MP material is embedded into the PI separator with a simple one-step casting process, it effectively clogs the large pores of the PI separator, preventing the occurrence of internal short circuits during charging. It is anticipated that the MP material can also suppress rapid thermal runaway upon cycling due to its ability to reduce the internal temperature of the LIB cell caused by the desirable endothermic behavior around 300 o C. According to experiments, the MP-coated PI separator not only decreases the thermal shrinkage rate better than commercial poly(ethylene) (PE) separators but also exhibits a desirable Gurley number (109.6 s/100 cc) and electrolyte uptake rate (240%), which is unique. The proposed separator is electrochemically stable in the range 0.0-5.0 V (vs. Li/Li + ), which is the typical working potential of conventional electrode materials. In practice, the MP-coated PI separator exhibits stable cycling performance in a graphite-LiNi 0.83 Co 0.10 Mn 0.07 O 2 full cell without an internal short circuit (retention: 90.3%).

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Section: Resultsmentioning

confidence: 98%

Poly(Imide) Separator Functionalized by Melamine Phosphonic Acid for Regulating Structural and Thermal Stabilities of Lithium-ion Batteries

Jeon,

Park,

Yim

2024

J. Electrochem. Sci. Technol

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“…The ber separator prepared by electrospinning method is widely used in the eld of lithium-ion battery separators due to its three-dimensional network structure and high porosity [7] . Common separator materials include polyacrylonitrile (PAN), polyimide (PI), polyvinylidene uoride (PVDF) [8][9][10][11] . PAN ber separators have been widely studied due to their high electronic insulation, excellent electrolyte a nity, and ion conductivity [12] .…”

Section: Introductionmentioning

confidence: 99%

Alkali etching enhanced polyimide-based three-layer composite separator for lithium-ion batteries

Jiang,

Chen,

Zhang

et al. 2024

Ionics

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Separators has directly affected the safety and electrochemical performance of lithium-ion batteries. In this study, an alkali etched enhanced polyimide (PI)/polyacrylonitrile (PAN)@ (Cellulose acetate) CA/PI three-layer composite separator is prepared using electrospinning, non-solvent phase separation, and alkali etching methods. The effects of alkali etching on the mechanical strength, thermal stability, and electrochemical performance of the PI/PAN@CA/PI separator are explored. The obtained separator has two different pore structures, and the surface of the alkali etched separator has abundant polar groups, further enhancing the migration rate of lithium-ions. The mechanical strength and thermal performance decrease with the prolongation of alkali etching time. When the alkali etching time is 3 min, the PI/PAN@CA/PI separator has the best comprehensive performance, with a mechanical strength of 17.8 MPa, ion conductivity of 1.22 mS cm − 1 , and interface impedance of 152 Ω. After 100 cycles of charging and discharging at a current density of 1 C, the capacity retention rate is 95.3%. At a current density of 5 C, the speci c capacity of charging and discharging can reach 114 mAh g − 1 , which is better than the 87.3 mAh g − 1 of the initial PI/PAN@CA/PI separator.

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“…This approach provides PI separators with interlinked and wide pores, facilitating Li + migration. But these extended pores can easily lead to micro-short circuits stemming from Li dendrite growth [18][19][20][21] and the inferior binding force among the electrospun PI bers results in unsatisfactory mechanical properties. [22][23][24] Although some efforts were made to improve the strength through doping inorganic nanoparticles, adding binders, or hot pressing, 16,25,26 no satisfactory results were achieved.…”

Section: Introductionmentioning

confidence: 99%

Porous, robust, thermally stable, and flame retardant nanocellulose/polyimide separators for safe lithium-ion batteries

Liu,

Li,

et al. 2023

J. Mater. Chem. A

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Thermotolerant separator of cross-linked polyimide fibers with narrowed pore size for lithium-ion batteries

Cited by 32 publications

References 41 publications

Poly(Imide) Separator Functionalized by Melamine Phosphonic Acid for Regulating Structural and Thermal Stabilities of Lithium-ion Batteries

Poly(Imide) Separator Functionalized by Melamine Phosphonic Acid for Regulating Structural and Thermal Stabilities of Lithium-ion Batteries

Alkali etching enhanced polyimide-based three-layer composite separator for lithium-ion batteries

Porous, robust, thermally stable, and flame retardant nanocellulose/polyimide separators for safe lithium-ion batteries

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