Ultrathin inorganic-nanoshell encapsulation: TiO2 coated polyimide nanofiber membrane enabled by layer-by-layer deposition for advanced and safe high-power LIB separator

Dong, Guoqing; Dong, Nianguo; Liu, Bingxue; Tian, Guofeng; Qi, Shengli; Wu, Dezhen

doi:10.1016/j.memsci.2020.117884

Cited by 45 publications

(13 citation statements)

References 48 publications

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“…To overcome this drawback, covalently bonding inorganic particles on the separator is an efficient approach to prevent the particles shedding from the separator. The nanoparticles can be chemically grafted on the polymer membrane by electron beam radiation, [ 66 ] in situ hydrolysis deposition, [ 67‐69 ] layer‐by‐layer self‐assembly process, [ 70,71 ] chemical cross‐linking [ 72‐74 ] ( Figure ), and so on. The high‐energy electron beam radiation can produce free radicals to uniformly initiate grafting reactions.…”

Section: Traditional Separators With High Thermal Stability and Mechanical Strengthmentioning

confidence: 99%

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

Liu

Jiang

et al. 2020

Energy & Environ Materials

121

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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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Section: Traditional Separators With High Thermal Stability and Mechanical Strengthmentioning

confidence: 99%

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

Liu

Jiang

et al. 2020

Energy & Environ Materials

121

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“…Considerable efforts have been made to improve the wettability and thermal stability of separators [16][17][18][19][20][21][22][23][24][25]. One strategy involved preparing non-woven mats of nanofibers, such as polyacrylonitrile (PAN) [16,17], polyvinylidene fluoride (PVDF) [18,19], polymer blends of polyimide [13,[20][21][22], and composite mats consisting of inorganic nanoparticles and nanofibers [23][24][25]. These nonwoven composite separators showed negligible shrinkage at elevated temperatures and enabled good ionic conductivities.…”

Section: Introductionmentioning

confidence: 99%

“…Considerable efforts have been made to improve the wettability and thermal stability of separators 16–25. One strategy involved preparing non‐woven mats of nanofibers, such as polyacrylonitrile (PAN) 16, 17, polyvinylidene fluoride (PVDF) 18, 19, polymer blends of polyimide 13, 20–22, and composite mats consisting of inorganic nanoparticles and nanofibers 23–25. These nonwoven composite separators showed negligible shrinkage at elevated temperatures and enabled good ionic conductivities.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Wettability of a PTFE Porous Membrane for a High‐Temperature Stable Lithium‐Ion Battery Separator

Guo

et al. 2022

Chem Eng & Technol

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A hydrophobic poly(tetrafluoroethylene) (PTFE) porous membrane was modified into a hydrophilic lithium-ion battery (LIB) separator with a higher affinity to the electrolyte via the hybrid consisting of a cationic fluorocarbon surfactant (FCS), polyethylenimine (PEI), and tetraethyl orthosilicate (TEOS), which can be in-situ biomineralized into SiO 2 nanoparticles. The obtained PTFE/FCS-PEI-SiO 2 separator showed a dynamic electrolyte contact angle, which decreased from 50.3°to 0°within 4 s, along with 215 % of electrolyte uptake. The ionic conductivity and the interfacial resistance were 9.12 mS cm -1 and 228.8 Ω, respectively. In addition, the cell equipped with the separator showed a capacity of 163.7 mAh g -1 at a current density of 0.2 C. Notably, the cell with the separator displayed good high-temperature stability.

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“…However, the electrolyte wettability of polyolefin separators is still not satisfactory because of the hydrophobic nature of polyolefin materials. 12 In order to enhance the compatibility between separator and electrolyte, many methods 2,13,14 have been proposed, such as the use of high-dielectric constant polymer materials as separators, [15][16][17][18] surface modification of polyolefin separators, [19][20][21][22][23][24][25] using polymer electrolytes, [26][27][28] and so on. Recently, ceramic NPs coating is widely used to enhance the electrolyte wettability as well as promote the thermal stability of separators.…”

Section: Introductionmentioning

confidence: 99%

Resin‐silica composite nanoparticle grafted polyethylene membranes for lithium ion batteries

Sun

2021

J of Applied Polymer Sci

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To avoid the peeling‐off of ceramic nanoparticles (NPs) from polyolefin membranes usually occurred in commercially available ceramic NPs coated polyolefin separators for lithium batteries, we propose a simple one‐pot in‐situ reaction method to modify commercial polyethylene (PE) separators by surface grafting 3‐Aminophenol/formaldehyde (AF)/silica (SiO2) composite NPs. The AF/SiO2 composite NPs form self‐supporting connected pores on the modified layer of the separator surface, which ensures the transportation of Li+. Moreover, the PE@AF/SiO2 separators has higher electrolyte wettability and compatibility than neat PE separators attributed to the plentiful polar functional groups in the AF/SiO2 layer and AF/SiO2 composite NPs, resulting in higher lithium ion transference number (tLi+= 0.62) and ionic conductivity (σ = 0.722 mS cm−1). More importantly, the discharge capacity, capacity retention rate and coulombic efficiency (136.2 mA h g−1, 87.9% and 99%, respectively) after 200 cycles of Li|NMC half batteries with PE@AF/SiO2 separators, are all more excellent than that with the pure PE separator (125 mA h g−1, 83.1% and 85%, respectively). Our results show that the PE@AF/SiO2 separators obtained by this modification method have higher electrochemical stability in the lithium battery system.

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Ultrathin inorganic-nanoshell encapsulation: TiO2 coated polyimide nanofiber membrane enabled by layer-by-layer deposition for advanced and safe high-power LIB separator

Cited by 45 publications

References 48 publications

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

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

Enhanced Wettability of a PTFE Porous Membrane for a High‐Temperature Stable Lithium‐Ion Battery Separator

Resin‐silica composite nanoparticle grafted polyethylene membranes for lithium ion batteries

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