Preparation and properties of polyimide films derived from hexaazatriphenylenehexacarboxylic acid trianhydride

Zhang, Xiaozhou; Han, Changyu; Liang, Tianhui; Jia, Hongge; Jian, Xigao; Wang, Jinyan

doi:10.1016/j.mtcomm.2022.104003

Cited by 2 publications

(1 citation statement)

References 37 publications

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“…The peaks at 16.6°and 22.4°originate from the PI film and are associated with the average interchain distance and amorphous structure, respectively. 35,36 The sharp diffraction peak at 5.6°can be ascribed to the (110) plane of COF300 and indicates the highly periodic structure of COF300. 33 The inserted image in Figure 3b shows the space-filling model of the crystal structure along the [001] direction, 32 indicating that COF300 exhibits pore sizes of approximately 7.8 Å within its channels.…”

Section: Resultsmentioning

confidence: 99%

Covalent Organic Framework-Coated Polyimide Ion-Track-Etched Separator with High Thermal Stability for Developing Lithium-Ion Batteries with Long Lifespans

Liu,

Cao,

Zhang

et al. 2024

ACS Appl. Mater. Interfaces

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Separators play a crucial role in inhibiting thermal runaway in lithium-ion batteries (LIBs). In this study, the doctor blade coating method and heavy-ion track etching technology were used to prepare a polyimide-based covalent organic framework (PI_COF) separator with excellent thermal stability and a long cycle life. Specifically, COF300 was simply coated on the surface of a polyimide-based track-etched membrane (PI_TEM) with straight through holes, which provided a rigid framework and high-temperature stability at 300 °C. These features were conducive to inhibiting thermal runaway, while porous COF300 with large holes increased the wettability of the electrolyte, facilitating lithium-ion migration and suppression of lithium dendrite growth; consequently, LIBs with an excellent cycling performance and a high rate capacity were obtained. The cell with the PI_COF separator delivered a high capacity of 90.0 mA h g −1 after 1000 cycles. The PI_COF separator with high thermal stability exhibited a long cycle life in LIBs. These features are beneficial for improving the safety characteristics of LIBs as well as for accelerating the practical application process of the PI_COF separator.

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Section: Resultsmentioning

confidence: 99%

Covalent Organic Framework-Coated Polyimide Ion-Track-Etched Separator with High Thermal Stability for Developing Lithium-Ion Batteries with Long Lifespans

Liu,

Cao,

Zhang

et al. 2024

ACS Appl. Mater. Interfaces

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Microsecond-Scale Transient Thermal Sensing Enabled by Flexible Mo _1−x W _x S ₂ Alloys

Li,

Kong,

et al. 2024

Research

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Real-time thermal sensing through flexible temperature sensors in extreme environments is critically essential for precisely monitoring chemical reactions, propellant combustions, and metallurgy processes. However, despite their low response speed, most existing thermal sensors and related sensing materials will degrade or even lose their sensing performances at either high or low temperatures. Achieving a microsecond response time over an ultrawide temperature range remains challenging. Here, we design a flexible temperature sensor that employs ultrathin and consecutive Mo 1− x W x S 2 alloy films constructed via inkjet printing and a thermal annealing strategy. The sensing elements exhibit a broad work range (20 to 823 K on polyimide and 1,073 K on flexible mica) and a record-low response time (about 30 μs). These properties enable the sensors to detect instantaneous temperature variations induced by contact with liquid nitrogen, water droplets, and flames. Furthermore, a thermal sensing array offers the spatial mapping of arbitrary shapes, heat conduction, and cold traces even under bending deformation. This approach paves the way for designing unique sensitive materials and flexible sensors for transient sensing under harsh conditions.

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Preparation and properties of polyimide films derived from hexaazatriphenylenehexacarboxylic acid trianhydride

Cited by 2 publications

References 37 publications

Covalent Organic Framework-Coated Polyimide Ion-Track-Etched Separator with High Thermal Stability for Developing Lithium-Ion Batteries with Long Lifespans

Covalent Organic Framework-Coated Polyimide Ion-Track-Etched Separator with High Thermal Stability for Developing Lithium-Ion Batteries with Long Lifespans

Microsecond-Scale Transient Thermal Sensing Enabled by Flexible Mo _1−x W _x S ₂ Alloys

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Preparation and properties of polyimide films derived from hexaazatriphenylenehexacarboxylic acid trianhydride

Cited by 2 publications

References 37 publications

Covalent Organic Framework-Coated Polyimide Ion-Track-Etched Separator with High Thermal Stability for Developing Lithium-Ion Batteries with Long Lifespans

Covalent Organic Framework-Coated Polyimide Ion-Track-Etched Separator with High Thermal Stability for Developing Lithium-Ion Batteries with Long Lifespans

Microsecond-Scale Transient Thermal Sensing Enabled by Flexible Mo 1−x W x S 2 Alloys

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Product

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Microsecond-Scale Transient Thermal Sensing Enabled by Flexible Mo _1−x W _x S ₂ Alloys