CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Jingwei Chen,Xinqiang Wang,Yongshuai Xie,Shuying Shi,Guanghui Zhang,Luyi Zhu
Gd 2 Zr 2 O 7 /ZrO 2 (GZC) composite fibers were prepared by electro-spinning method. The XRD , XPS and Raman results showed that there were three crystalline phases, tetragonal phase ZrO 2 , cubic phase ZrO 2 and defect fluorite phase Gd 2 Zr 2 O 7 in GZC composite fibers. GZC fibers remained an intact fiber texture up to 1400 °C according to SEM photographs. The thermal conductivity of GZC fibers was between 0.173 W/(m·K) at 400 °C and 0.309 W/(m·K) at 800 °C, which was lower than that of 7YSZ under the same experimental conditions. The fiber sheet with density about 3.5 g/cm 3 has thermal shrinkage less than 3% at 1400 °C. Hence, GZC fibers could be used as refractories for heat protection.
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Xueshuai Wang,Chengxian Cao,Sha Li,Liuchun Zheng
Poly(ethylene terephthalate- co -1,4-cyclohexanedimethylene terephthalate) (PETG) is a versatile engineering plastic with excellent properties and has been widely used in heat-shrinkable films, sheets, and packaging. A series of PETG with various contents of 1,4-cyclohexanedimethylene (CHDM) content was synthesized by transesterification and polycondensation. The PETG synthesized in this work has less DEG by-product content and exhibits excellent combined properties. This is attributed to the fact that the transesterification process leads to the formation of methoxy terminal groups (–OCH 3 ) in PETG, which exhibit higher stability compared to hydroxyl terminal groups (–OH). In addition, the properties of PETG can be controlled at the macromolecular structure level by simply regulating the content of CHDM. The chemical structure, thermal properties, mechanical performance, rheological properties, and heat shrinkage performance of PETG were systematically studied. The results demonstrated that CHDM content significantly influenced crystallization behavior, glass transition temperature ( T g ), thermal stability, and rheological properties. This work offers a theoretical foundation for advancing high-performance PETG and proposes novel synthesis strategies for applications. The results of this research support the promotion of the wide application of PETG materials in the packaging, medical, electronics, and automotive industries, especially in environmental protection and sustainable development, providing new development directions and solutions for the industry.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Bo Liang,Siqi Tang,Qingbai Jiang,Chuangsheng Chen,Xu Chen,Shengliang Li,Xuehui Yan
This paper presents the preparation and characterization of a series of PEO-PMMA composites containing different lithium salts (LiClO 4 or LiTFSI) with or without nano-Al 2 O 3 . Nano-Al 2 O 3 is added to the polymer electrolytes to alter the morphology, ionic conductivity , interfacial and thermal shrinkage properties. Nano-Al 2 O 3 can effectively improve the stability of the polymer electrolyte membrane interface. The tensile strength of the PEO-PMMA-LiTFSI-Al 2 O 3 electrolyte membrane is 3.24 MPa at room temperature . The study shows that the ion conductivities at room temperature for PEO-PMMA-LiTFSI (EO/Li + = 10) and PEO-PMMA-LiTFSI-Al 2 O 3 (EO/Li + = 10) are 6.71 × 10 −7 S/cm and 9.39 × 10 −7 S/cm, respectively. A good dimensional stability was observed for PEO-PMMA-LiTFSI with a thermal shrinkage of 8.7%. The electrochemical windows of PEO-PMMA-LiTFSI and PEO-PMMA-LiTFSI-Al 2 O 3 are all stable up to 4.6 V versus Li + /Li, which makes them good electrolyte candidates of lithium ion batteries with high-potential cathodes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Biosensors-Basel
·
2025
·Vol. 15
·期 2
·122
·
IF 5.6
Lei Fan,Zhaoxin Wang,Tao Yang,Qiang Zhao,Zhixin Wu,Yijie Wang,Xue Qi,Lei Zhang
Flexible pressure sensors have drawn growing attention in areas like human physiological signal monitoring and human–computer interaction. Nevertheless, it still remains a significant challenge to guarantee their long-term stability while attaining a wide detection range, a minute pressure testing limit, and high sensitivity. Inspired by the wrinkles on animal skins, this paper introduces a flexible pressure sensor with wrinkled microstructures. This sensor is composed of a composite of reduced graphene oxide (rGO), single-walled carbon nanotubes (SWCNTs), and polydimethylsiloxane (PDMS). After optimizing the proportion of the composite materials, the flexible pressure sensor was manufactured using highly efficient heat-shrinkable films. It has a sensitivity as high as 15.364 kPa−1. Owing to the wrinkled microstructures, the sensor can achieve an ultra-wide pressure detection range, with the maximum reaching 1150 kPa, and is capable of detecting water wave vibrations at the minimum level. Moreover, the wrinkled microstructures were locked by PDMS. The sensor acquired waterproof performance and its mechanical stability was enhanced. Even after 18,000 cycles of repeated loading and unloading, its performance remained unchanged. By combining with an artificial neural network, high-precision recognition of different sounds and postures when grasping different objects was realized, with the accuracies reaching 98.3333% and 99.1111%, respectively. Through the integration of flexible WIFI, real-time wireless transmission of sensing data was made possible. In general, the studied sensor can facilitate the application of flexible pressure sensors in fields such as drowning monitoring, remote traditional Chinese medicine, and intelligent voice.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2019
·Vol. 12
·期 17
·2813
·
IF 2.972
Haijuan Li,Ling Li,Shuaizhi Zheng,Xinming Wang,Zengsheng Ma
To improve the thermal shrinkage and ionic conductivity of the separator for lithium-ion batteries, adding carboxylic titanium dioxide nanofiber materials into the matrix is proposed as an effective strategy. In this regard, a poly(vinylidene fluoride-hexafluoro propylene)/dibutyl phthalate/carboxylic titanium dioxide (PVDF-HFP/DBP/C-TiO2) composite separator is prepared with the phase inversion method. When the content of TiO2nanofibers reaches 5%, the electrochemical performance of the battery and ion conductivity of the separator are optimal. The PVDF-HFP/DBP/C-TiO2(5%) composite separator shows about 55.5% of porosity and 277.9% of electrolyte uptake. The PVDF-HFP/DBP/C-TiO2(5%) composite separator has a superior ionic conductivity of 1.26 × 10−3S cm−1and lower interface impedance at room temperature, which brings about better cycle and rate performance. In addition, the cell assembled with a PVDF-HFP/DBP/C-TiO2separator can be charged or discharged normally and has an outstanding discharge capacity of about 150 mAh g−1at 110 °C. The battery assembled with the PVDF-HFP/DBP/C-TiO2composite separator exhibits excellent electrochemical performance under high and room temperature environments.Keywords:TiO2nanofiber;PVDF-HFP;composite separator;phase inversion;thermal shrinkage;ionic conductivity
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Liubin Shi,Jindong Li,Shilong Xiong,Dong-Liang Peng,Yuanzhi Chen
A B S T R A C T Ni ultrafine particles synthesized via aqueous solution method have advantages such as narrow particle size distribution and low cost. However, the particle crystallinity is usually poor, which may lead to severe shrinkage during the sintering process for the preparation of film electrodes. In this study, Ni ultrafine particles with a size of about 180 nm are synthesized via an aqueous solution method, then heat treated in a bath of binary chloride salts (AlCl 3 -NaCl) at different temperatures, and finally made into a paste, printed onto a ceramic substrate and sintered into a conductive film. The results show that the crystallinity, oxidation resistance and thermal shrinkage resistance of the samples after molten salt treatment are significantly improved. The sintered film electrode prepared from Ni sample without molten salt treatment exhibits severe shrinkage and large disconnected areas, whereas the integrity and continuity of the films with molten salt treatment are notably improved. Lower resistivities are observed for film samples with molten salt treatment. The results show that molten salt treatment is an effective way to increase the crystallinity of Ni ultrafine particles, and thus reduce the thermal shrinkage and improve the integrity of Ni film electrodes.
研究领域:
材料科学
·
纳米技术
·
电极材料
·
冶金学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2014
·
IF 4.908
He Chen,Qian Lin,Qiang Xu,Yang Yang,Zongping Shao,Yong Wang
Atomic layer deposition (ALD) of TiO 2 was applied on porous polypropylene (PP) membranes which were used as separators in lithium-ion batteries (LIBs) composed of Li 4 Ti 5 O 12 (LTO) anode/Li cathode. Without plasma activation on the bare PP membrane, the initial deposition of TiO 2 was based on the subsurface nucleation mechanism , which prevented the formation of a conformal hydrophilic TiO 2 layer at low ALD cycles. The improvement of wettability of the PP membrane to the electrolyte could only be achieved at high ALD cycles up to 500. However, the severe narrowing of membrane pores counterbalanced the wetting enhancement, which hardly improved the performance of the LIBs. Plasma pretreatment was efficient to generate active groups on the highly chemically inert surface of polypropylene membranes, thus ultrathin TiO 2 films could be conformally deposited by ALD on the membrane surface based on the layer-by-layer mechanism at cycles as low as 20. Such a conformal ultrathin layer of TiO 2 was confirmed to concurrently overcome both the thermal shrinkage and poor wettability of the PP membranes. Beneficial from the improved wettability at no expense of pore size, the electrochemical performances of LIBs such as specific discharge capacities at different discharge rates were upgraded.
研究领域:
材料科学
·
电化学
·
能源存储
·
表面工程
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Ying Wang,Menghe Zhu,Jianhao Zhu,Lei Liu,Liwei Ma,Yongzhi Wu,Qingliang Lv,Lei Wang
Microporous polyethylene (PE) membranes are commonly used separators in lithium–sulfur (Li S) batteries. However, these membranes suffer from severe shrinkage at high temperatures and exhibit limited physical barrier capability against polysulfides, which leads to significant shuttle effects, resulting in capacity decay and safety hazards. In the present study, we report a facile strategy to construct a coral-like CaCO 3 composite functional layer on the PE separator surface using a polydopamine (PDA)-assisted in situ liquid-phase growth technique. This endows the separator with excellent mechanical properties, outstanding thermal shrinkage resistance, and exceptional flame retardancy. The multifunctional composite layer enables the synergistic suppression of polysulfides. The phenolic hydroxyl/amino functional groups in PDA provide chemical anchoring, effectively trapping polysulfides. Simultaneously, the coral-like porous structure of CaCO 3 establishes a physical barrier, restricting polysulfide migration. Furthermore, owing to the nitrogen-containing flame retardancy of PDA and the barrier effect of CaCO 3 , the composite layer demonstrates excellent flame retardancy. This composite layer enhances electrolyte wettability and promotes uniform lithium-ion transport, thereby suppressing lithium dendrite formation. These advantages enable Li S batteries employing the CaCO 3 @PDA@PE composite separator to demonstrate significantly improved electrochemical performance. This approach results in high specific capacity, excellent rate capability, and extended cycle life. This study provides a cost-effective novel strategy of “chemical anchoring–physical barrier” synergy for developing Li S battery separators with high safety and superior electrochemical performance.
研究领域:
材料科学
·
储能
·
电化学
·
纳米技术
·
表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2013
·
IF 3.479
Ming Xiong,Haolin Tang,Yadong Wang,Mu Pan
With the widely use in portable electronic devices and electric vehicles, the safety of lithium-ion battery has raised serious concerns, in which the thermal stability of separator plays an essential role in preventing thermal runaway reactions. The novelty of this work is to coat commercialized polyethylene (PE) separator and trilayer polypropylene/polyethylene/polypropylene (PP/PE/PP) separator with ethylcellulose (EC), a thermally stable and renewable biomass. The formation of the EC layer with high porosity is through a simple dipping and extracting process. The effects of the EC layer on thermal shrinkage, electrolyte wettability and cell performance are investigated. After coating, the thermal shrinkage of PE separator at shutdown and meltdown point is reduced from 20% to 9% and 42% to 23% respectively, while the drop of OCV under increasing temperature is also postponed from 130 °C to 160 °C. The electrolyte wettability of pristine trilayer PP/PE/PP separator is greatly improved, leading to increased capacity retention from 28% to 99% of the cell.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 12
·期 6
·5421-5430
·
IF 1.5
Yangyang Xi,Peng Zhang,Haining Zhang,Zhaohui Wan,Wenmao Tu,Haolin Tang
Composite membrane separators are fabricated by coating one side of microporous polyethylene membrane with poly(methyl methacrylate) modified titanate nanoparticles that are synthesized through emulsifier-free emulsion polymerization of methacrylate-functionalized titanate nanoparticles. The formed composite membrane separators exhibit great thermal-shrinking resistance due to the introduction of thermal resistant titanate nanoparticles. After immersed into electrolyte solution, the swelling poly(methyl methacrylate) microspheres leads to the formation of gel electrolyte, thus stabilizing the electrolyte. Moreover, the porous structure of the coated layer can facilitate the swelling of electrolyte and the transport of lithium ions. The thus-assembled lithium ion battery shows an improved cycle performance and rate capability.
研究领域:
材料科学
·
电化学
·
能源存储
·
高分子纳米复合材料
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Qian-Qian Gu,Hong-Jin Xue,Zhan-Wei Li,Jing-Chuan Song,Zhao-Yan Sun
In lithium-ion batteries, separator serves to isolate the positive and negative electrodes, as well as provide a free shuttle for Li-ion transport inside the battery . Commercial polyolefin separator has relatively higher thermal shrinkage and lower electrolyte wettability , which limits the application of batteries in extreme conditions. In this work, we prepared phenolic resin (AF) modified polyethylene (PE) composite separators by the process of immersion in situ reaction. The obtained PE@AF composite separator has lower thermal shrinkage and higher electrolyte wettability than pure PE separator. The shrinkage of our prepared PE@AF separator is only 6% when stored at 145 °C for 30 min, greatly smaller than the pure PE separator (more than 77%). Moreover, the ion conductivity of PE@AF composite separator increases from 0.206 mS cm −1 for the pure one to 0.604 mS cm −1 . Apart from this, the Li/electrolyte-soaked PE@AF separator/LiFePO 4 battery exhibits a higher coulombic efficiency (96.7%) and discharge capacity retention rate (86.0%) after 450 cycles than the pure one (67.4% and 72.7%, respectively). Our results indicate that the AF coating plays a vital part in improving the thermal stability and electrochemical property of polyolefin separators.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2016
·
IF 5.267
Wenju Chen,Liyi Shi,Hualan Zhou,Jiefang Zhu,Zhuyi Wang,Xufeng Mao,Mingming Chi,Lining Sun,Shuai Yuan
With the development of electric vehicles, the traditional polyolefin separators can not meet the increasing requirements of lithium ion batteries with high power density, high energy density, and high safety performance. Herein, a novel water-based binder is synthesized by grafting carboxyl groups onto cellulose diacetate. When the polyethylene (PE) separator is coated by this binder and SiO2 nanoparticles, the thermal shrinkage of the modified separator is observed to be almost 0% after exposure at 200 °C for 30 min. The puncture strength significantly increase from 5.10 MPa (PE separator) to 7.64 MPa. More importantly, the capacity retention of the cells assembled with modified separators after 100 cycles at 0.5 C increase from 73.3% (cells assembled with PE separator) to 81.6%, owing to the excellent electrolyte uptake and the good compatibility with lithium electrode. Besides, the modified separator shows excellent surface stability after 100 cycles. Considering the above excellent properties, this composite separator shows high potential to be used in lithium ion batteries with high power density and safety.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）