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XPS spectra of PMIA membrane and PMIA-PDA-4 membrane (a). C 1 s core-level spectra and N 1 s core-level spectra of PMIA membrane (b, c) and PMIA-PDA-4 membrane (d, e)
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Poly(m-phenylene isophthalamide) (PMIA) membranes are promising heat-tolerant separator candidates of lithium-ion batteries (LIBs), while their wettability toward carbonate electrolyte and corresponding batteries performance are not desirable. Herein, PMIA membranes coated with ultrathin mussel-inspired polydopamine (PDA) layer were fabricated as s...
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... As shown in Fig. 8d, the recycled meta-aramid films had no significant dimensional shrinkage even after 1 h at 200 • C. The wrinkles on the surface of the film were caused by over-thinning during the preparation process, not by heat shrinkage. The non-flammability and thermal stability contribute to the safety characteristics of the battery [30,39]. The resistivities of the films were all around 1.7 × 10 14 Ω⋅cm measured by the material resistivity tester (LFY-406, Shandong Institute of Textile Science, China), which reached the value required for insulating materials. ...
The annual replacement of a large number of used dust filter bags generated as industrial waste has seriously polluted the environment and caused waste of resources. The meta-aramid filter media is a typical representative of them. In this work, a complete and efficient process for the recovery and reuse of meta-aramid filter bag was proposed, which mainly included three stages, i.e., pretreatment, dissolution recovery and reuse. Firstly, the feasibility of recycling the pretreated used meta-aramid filter media was demonstrated by FT-IR, XRD and SEM characterization. Then the optimum dissolution method was selected for the recovery of used filter materials. The effects of dissolving temperature, type and concentration of solubilizer on dissolution time, solubility and dissolution products were systematically investigated. 110 °C, 4 wt% LiCl as solubilizer and DMAc as solvent were selected as the preferred conditions. The method was successfully used to achieve 100% dissolution recovery of used meta-aramid material with a concentration of 25 wt%, and the whole recovery process was environmentally friendly. Moreover, the recovered meta-aramid solution was used to prepare meta-aramid films by phase inversion method. The performance tests and characterization confirmed that the obtained films had good thermal stability, mechanical properties, flame retardancy and insulation properties. The whole recycling process not only alleviated the threat of waste filter bags to the environment, but also achieved high quality reuse of meta-aramid filter material and had great application prospects.
... The rate performance showed that the discharge capacity of the cell with c-GPE was 65.5 mAh g -1 at 2 C, while the commercial Celgard 2400/Li cell was only 9.8 mAh g -1 . Due to their poor mechanical strength (Table 2), the PDA-coated separators are not yet suitable for largescaled commercial applications of LIBs so far [34,36,38,41,44,53,54]. Generally, three basic mechanical requirements are considered necessary for commercial separators: tensile strength to sustain the stress during battery assembly (at least 95 MPa); puncture strength to avoid the penetration of the electrode materials or Li-dendrites (at least 300 g/ mil); mix penetration strength to avoid electrode particles penetration and cell short circuit [23,31,55]. ...
With the increasing awareness of global energy saving, the new energy storage devices represented by lithium-ion batteries (LIBs) have attracted more and more attention. The development of new materials of LIBs is crucial to the pursuit of energy efficiency and sustainable development. Polydopamine (PDA) is a synthetic analogue of natural melanin, which is synthesized by the oxidative polymerization of dopamine. Recently, polydopamine-based materials have received widespread research interest for electrochemical energy storage owing to their unique chemical structural versatility, electrochemical property, excellent adhesive property, etc. This review focuses on the representative examples of PDA-based materials applications in Li-ion battery materials (separator, current collector, active material, electrode, binder, solid electrolyte, and additive). The advantages and landmark achievements of PDA-based materials in the field of LIBs were summarized. The effect and mechanism of PDA-based materials on the electrochemical performance of the batteries are discussed in detail. Also, the outlook and future directions in this research field are also given. It is hoped to provide some useful information and reference for the research of PDA-based functional materials.
... Polyimide (PIs) is widely used in the separator field due to the improved thermal stability and different separators based on this polymer are being developed, such as PI nonwovens with diphenyl phosphate (DPhP) as plasticizer [204], PI with organic montmorillonite (OMMT) [205], a three-dimensionally ordered microporous polyimide (3DOM PI) separator developed by micropatterning [206], coating of silicon nitride on both sides of polyimide separator [207], and a PVDF-HFP/PI side-by-side bicomponent electrospun separator [208]. In addition to PI, other polymers such as poly(aryl ether benzimidazole) (OPBI) [209], polydopamine-coated poly(m-phenylene isophthalamid) membrane [210], and poly(phenylene sulfide) [211] are used due to their high thermal resistance. ...
Environmental issues related to energy consumption are mainly associated with the strong dependence on fossil fuels. To solve these issues, renewable energy sources systems have been developed as well as advanced energy storage systems. Batteries are the main storage system related to mobility, and they are applied in devices such as laptops, cell phones, and electric vehicles. Lithium-ion batteries (LIBs) are the most used battery system based on their high specific capacity, long cycle life, and no memory effects. This rapidly evolving field urges for a systematic comparative compilation of the most recent developments on battery technology in order to keep up with the growing number of materials, strategies, and battery performance data, allowing the design of future developments in the field. Thus, this review focuses on the different materials recently developed for the different battery components—anode, cathode, and separator/electrolyte—in order to further improve LIB systems. Moreover, solid polymer electrolytes (SPE) for LIBs are also highlighted. Together with the study of new advanced materials, materials modification by doping or synthesis, the combination of different materials, fillers addition, size manipulation, or the use of high ionic conductor materials are also presented as effective methods to enhance the electrochemical properties of LIBs. Finally, it is also shown that the development of advanced materials is not only focused on improving efficiency but also on the application of more environmentally friendly materials.
The safety of lithium-ion batteries (LIBs) has always been a research hotspot in the field of new energy. Herein, F-TiO2/PMIA composite separator with thermotolerance and mechanical robustness is designed and fabricated by directed-assembly with strong hydrogen bonding between the poly (m-phenylene isophthalamide) (PMIA) and fluorine functionalized porous titanium dioxide (F-TiO2). The results show that F-TiO2/PMIA composite separator exhibits excellent mechanical properties with tensile strength of 24.6 MPa. The elongation at break is 45.6%, which is increased by 591% compared with PMIA separator (6.6%), closing to Celgard PP separator (48.5%). At the same time, the F-TiO2/PMIA composite separator possesses flame resistance and self-extinguishing properties. Moreover, does not shrinkage under the heating conditions of 250 °C, which greatly improves the safety of LIBs. In terms of electrochemical performance, F-TiO2/PMIA composite separator has the highest ionic conductivity (1.30 mS cm⁻¹) and delivers a high initial discharge capacity of 146.6 mAh g ⁻ ¹ and a discharge capacity of 134.3 mAh g ⁻ ¹ after 50 cycles at 0.2 C, with capacity of 90.1 mAh g ⁻ ¹ at 2 C. Therefore, the novel F-TiO2/PMIA composite separator offers promising commercial prospects in future high-safety and high-performance energy applications.
At present, rechargeable batteries are researched due to the increasing demand for electricity. For these energy storage devices, their energy density or power density are highly dependent on electrode materials including organic, inorganic and their composite substances. Organic electrode materials with structural diversity and tunability begin to attract attention, because it can better adapt to different sizes of cations. As a kind of organic electrode material, eumelanin-inspired nanomaterials (eumelanin-inspired nanomaterials mean natural eumelanin and artificial synthetic eumelanin-PDA in this review) have been widely used in rechargeable batteries and supercapacitors (SCs) including anodes, cathodes, separators and electrolytes. Eumelanin-inspired nanomaterials can mainly use to gain/lose electrons with reversible bonding of metal ions in order to form an electric current, and the performance of energy storage devices can be improved due to its many advantages, such as nanometer size, adhesion and hydrophilia. However, the in-depth summarization of the current work from the perspective of energy storage mechanisms is still lacking at present. In this review, the preparation methods and energy storage mechanisms of eumelanin-inspired nanomaterials are systematically summarized. The applications and current challenges of eumelanin-inspired nanomaterials on rechargeable batteries and SCs have been introduced, and the future perspectives in the rational fabrication of higher performance energy storage devices by the eumelanin-inspired nanomaterials have been proposed.
Layer-by-Layer (LbL) assembly was attractive as a versatile tool to address the flammability of cotton, while the washing fastness of LbL coating stayed an issue. Aiming to tackle this issue, LbL layers consisted of phenylphosphonic acid (PHA) and 3-aminopropyltriethoxysilane (APTES) was deposited on polydopamine (PDA)-coated cotton. The prepared cotton reached 31.4% of limiting oxygen index (LOI), and extinguished immediately after removing the ignitor. Peak of heat release rate (pHRR) attenuated around 36 % compared with pure cotton. A combined barrier and quenching mechanisms were proposed. Moreover, enhanced washing durability (24.1% of LOI) was achieved even after 50 detergent laundering cycles. A facile, boosted LbL approach with proposed π−π stacking interactions between PDA abundant aromatic structures and benzene ring in PHA from LbL layers, is first to put forward to construct durable efficient flame retardant (FR) cotton. This work attempted to enlighten more thoughts and design for durable FR cotton fabrics.
A polyetherimide/polyvinylidene fluoride (PEI/PVDF) coaxial fiber membrane coated with polyethylene (PE) porous microspheres with thermal shutdown function was prepared. The PE porous microspheres created by the suspension dispersion method are composed of a large number of pleated petal structures, which contain abundant pore structures and have a melting point of 108°C. Ionic conductivity test, scanning electron microscope test, open circuit voltage test, and cycle performance test show that the composite membrane with PE microspheres layer can effectively close the pore structure at 110°C and stop the battery reaction. The thermal stability test shows that the composite membrane does not shrink at 210°C, the thermal shutdown temperature window is as high as 100°C, and the PE coating can significantly improve the high temperature thermal dimensional stability of the membrane. Thanks to the porous microstructure of PE microspheres and the good electrolyte affinity of the PVDF skin layer, the PE composite membrane has good electrolyte wetting and uptake capabilities. The battery assembled by the PE composite membrane has a capacity retention rate of 88.6% after 100 cycles at 0.5 C and has excellent C‐rate capability.
