Article
Polymer Science
Tae-Yang Jeong, Young Dong Lee, Yoojung Ban, Juho Lee, Hayeong Lee, Yong Ku Kwon
Summary: By incorporating surface-treated hollow mesoporous silica nanoparticles, the volume shrinkage of wet gels during drying process is avoided, resulting in the formation of a robust network structure of PI hybrid xerogels. The application of PI hybrid xerogel separators in lithium ion batteries shows significantly improved electrolyte uptake and interfacial compatibility compared to traditional PI separators.
Article
Polymer Science
Young Dong Lee, Jirayu Yuenyongsuwan, Phornwalan Nanthananon, Yong Ku Kwon
Summary: Novel polyimide composite films containing graphene oxide are prepared and used in lithium-sulfur batteries. The composite films show excellent thermal and chemical stability, reversible adsorption of polysulfide, and improved battery performance.
Article
Materials Science, Ceramics
Young Sunwoo, Gopalu Karunakaran, Eun-Bum Cho
Summary: Hollow mesoporous silica nanospheres were synthesized using pentablock copolymer templates under acidic aqueous conditions, with tetraethyl orthosilicate as the silica precursor. The structure could be tuned by using different length pentablock copolymer templates, resulting in variations in pore structure and morphology. The samples demonstrated hydrothermal stability and the formation of hollow mesopore structures under room temperature conditions.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Jianwei Li, Xuanning Zhang, Yuyan Lu, Keliang Linghu, Chen Wang, Zhonglei Ma, Xinhai He
Summary: In this study, composite nanofibrous membranes (CNMs) with enhanced mechanical strength and thermal stability were successfully fabricated by synthesizing fluorinated polyimide (FPI) and blending it with polyvinylidene fluoride (PVDF). The CNMs showed improved tensile strength and almost no dimensional shrinkage after heat treatment. In addition, the CNMs exhibited enhanced electrochemical performances compared to neat PVDF and commercial Celgard membranes, with higher electrolyte uptake and ionic conductivity. The prepared CNMs offer a promising approach for high-performance separator design.
ADVANCED FIBER MATERIALS
(2022)
Article
Energy & Fuels
Bingbing Huang, Lina Jin, Xinye Qian, Jianyu Chen, Jian Cheng, Yuhe Wang
Summary: In this study, a composite of carbon nanotubes and hollow Co9S8 was applied on the surface of the PE separator for lithium-sulfur batteries (LSBs). The composite material effectively addressed the issues of low sulfur conductance, volume expansion, and shuttle effect, resulting in improved discharge capacity, cycling stability, and safety of the batteries.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Materials Science, Composites
Menglin Li, Lei Sheng, Rong Xu, Yang Yang, Yaozong Bai, Shangjun Song, Gaojun Liu, Tao Wang, Xianli Huang, Jianping He
Summary: By treating PI nanofiber membrane with lithium polyacrylate (PAALi) binder, the mechanical strength is improved, making it promising for high-power lithium ion battery applications.
COMPOSITES COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Jui-Yu Pai, Cheng-Ta Hsieh, Chih-Hung Lee, Jeng-An Wang, Hao-Yu Ku, Chun-Lung Huang, Laurence J. Hardwick, Chi-Chang Hu
Summary: Functionalised polyimide separators with SiO2 nanoparticles enhance mechanical strength, electrolyte uptake capability, and ionic conductivity, improving the performance of electrical double-layer capacitors and lithium-ion batteries. Adding SiO2 NPs helps tailor the properties of the polyimide separator for specific applications, such as high-rate performances and thermal shutdown function.
JOURNAL OF POWER SOURCES
(2021)
Article
Engineering, Chemical
Yang Wang, Minhao Guo, Hui Fu, Zhenzhong Wu, Yizhe Zhang, Guojie Chao, Suli Chen, Longsheng Zhang, Tianxi Liu
Summary: This article presents a facile and scalable strategy to prepare thermotolerant separators of cross-linked PI fibers with a narrowed pore size via blended electrospinning and thermal imidization. The resulting separator exhibits higher porosity, better electrolyte adsorption, and higher ionic conductivity, leading to greatly enhanced electrochemical performance in lithium-ion batteries.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Chemistry, Physical
Hechun Wei, Wei Huang, Ketong Luo, Yanqun Huang, Shengkui Zhong, Dongliang Yan
Summary: Hollow Ni0.75Zn0.25Fe2O4 nanospheres with PVP-assisted hydrothermal strategy were successfully fabricated and displayed good dispersibility and high specific surface area. The nanospheres also demonstrated satisfactory cycle life and rate performance as a lithium ion battery negative electrode.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Wenxuan Ren, Kerun Zhu, Wei Zhang, Haichen Liang, Li Xu, Lipeng Wang, Chaochao Yang, Yi Yang, Pengfei Zhang, Fei Wang, Yonggang Wang, Wei Li
Summary: A modification strategy of separator is proposed to block dendritic deposition via dendritic channels and inhibit lithium dendrites in high-energy-density lithium metal batteries. A porous shield-like film is formed on the polypropylene separator using ultra-small silica nanospheres with unique dendritic mesopores. This film provides hierarchical pores for ion flux and abundant Si(OH)(x) groups for adsorbing TFSI- in the electrolyte and accelerating Li+ transport. The dendritic mesochannels diversify lithium growth directions and contribute to a more homogeneous deposition process, achieving dendrite-free deposition for stable cycles in Li|Li symmetric cells.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Environmental
Junfeng Yu, Nanxi Dong, Bingxue Liu, Guofeng Tian, Shengli Qi, Dezhen Wu
Summary: In this study, a PP@PI microsphere composite separator with excellent thermal stability, flame retardancy, and high ionic conductivity was prepared by a simple blade-coating process. The composite separator showed improved thermal stability, liquid retention capacity, and adhesion compared to the pure commercial PP separator. The lithium-ion battery assembled with this composite separator exhibited higher discharge capacity and cycle stability, as well as excellent safety at high temperatures.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Applied
Lina Jin, Zhonghua Fu, Xinye Qian, Bingbing Huang, Fang Li, Yuhe Wang, Xiangqian Shen
Summary: A metal-doped carbon nanocage material for battery coating layer is proposed to improve the performance of Li-S batteries. Metal Co doping and N active sites can increase the chemical adsorption capacity of polysulfides and accelerate redox kinetics. The modified Co-N-C coating layer shows promising cycle performance and rate capability for Li-S batteries with high sulfur areal loading.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Biochemistry & Molecular Biology
Jun Pu, Xiaomei Zhu, Jie Wang, Shaomeng Yu
Summary: Edelweiss shaped NiCo2O4 hollow nanospheres were prepared by a template method to modify the separator in Li-S batteries, inhibiting the shuttle effect of soluble polysulfides and improving slow reaction kinetics. The modified separator provided good electrolyte wettability for enhanced Li-ion migration and strong chemical binding sites for loading sulfur species. The hollow structure acted as a physical barrier to mitigate sulfur species diffusion. As a result, the sulfur cathode based on this composite separator showed significantly enhanced electrochemical performance, with a high capacity of 505 mAh g(-1) retained after 300 cycles at 4 C.
Article
Nanoscience & Nanotechnology
Wencai Zhao, Yongfeng Yuan, Simin Yin, Gaoshen Cai, Shaoyi Guo
Summary: Hollow mesoporous nanospheres MoO2/C are successfully constructed through metal chelating reaction and the Kirkendall effect. As an anode material for lithium-ion batteries, the composite shows high specific capacity and excellent cycling performance.
Article
Materials Science, Multidisciplinary
Kecong Yang, Zelin Liu, Jingchao Chai, Yun Zheng, Xiangnan Fu, Yang Huan Shen, Jia Chen, Zhihong Liu, Shengwei Shi
Summary: This study aims to improve the thermal stability and safety of lithium-ion batteries (LIBs) by using polyimide/poly(vinylidene fluoride)-co-hexafluoropropylene (PI/PVDF-HFP) composite separator. The composite separator has higher porosity, better electrolyte uptake, and superior wetting properties, which contribute to reduced interfacial impedance and improved ion conductivity. It also exhibits excellent flame retardancy and negligible thermal shrinkage.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Polymer Science
Yuanzhang Jiang, Xuyi Wang, Yanting Han, Dakai Gong, Yingchun Gu, Lin Tan
Summary: In this study, FeCl3 and poly(acrylic acid) (PAA) were doped into waterborne polyurethanes (WPUs) to create multifunctional materials with self-healing and antimicrobial properties. WPU/Fe/PAA-5.5, containing 5.5 wt % PAA, exhibited excellent mechanical properties, strong self-healing capabilities, and an impressive antimicrobial rate of over 90%. These supramolecular films were also highly recyclable through hot-pressing.
Article
Polymer Science
Longyu Tian, Min Wang, Guangming Liao, Baoliang Liu, Sujuan Zhang, Yucheng Sun, Zhen Meng, Jintao Zhang, Zaijun Lu
Summary: Two kinds of benzoxazine monomers were synthesized and used to prepare polybenzoxazine anion exchange membranes (AEMs) with quaternary ammonium functionalization. The LQPBZ AEM exhibited better ion conductivity and alkaline stability.
Article
Polymer Science
Claire A. Lemarchand
Summary: This study investigates the shock behavior of three different polymers through molecular dynamics simulations. The results reveal specificities in the shock behavior of polymers, including deviations from the linear relation between shock velocity and particle velocity, as well as differences in shear stress relaxation behind the shock front. It is found that the deviation of the Hugoniot locus is related to the change in the relative contribution of bonding and non-bonding potential energies, while polymers with higher glass transition temperatures exhibit slower shear stress relaxation.
Article
Polymer Science
Zengquan Liu, Xiaochun Yin, He Zhang, Shuo Gao, Qinglin Kuang, Yanhong Feng
Summary: A powder solid-state extension (PSSE) technology was proposed to address the high melt viscosity issue of UHMWPE. By uniaxial extension and sintering in the solid state, a highly self-reinforced material was prepared. X-ray diffraction and scattering techniques were used to study the structural evolution during the PSSE process, and a solid-phase induced transformation model was established.
Article
Polymer Science
Zhike Li, Anyu Luo, Rui Zhou, Xin Li, Haiyan Li
Summary: A novel high temperature resistance IL@SiO2 nanocapsules were successfully prepared and their friction and wear properties in PA6 composites were studied. The addition of IL@SiO2 nanocapsules reduced the friction coefficient and wear rate without affecting the mechanical properties of PA6. The synergy between the IL core and SiO2 wall in the nanocapsules improved the self-lubricating performance of the PA6 composites.
Article
Polymer Science
Xin Liu, Xuhong Guo, Qi Liao
Summary: In this study, an algorithm for accurately estimating viscosity is developed using molecular dynamics simulations and the Green-Kubo formula. This algorithm can be applied to complex systems with long correlations, such as macromolecular and biological simulation systems.
Article
Polymer Science
Hao Pu, Yun-Lei Hou, Jing -Zhou Chen, Dong -Lin Zhao
Summary: The use of modified graphene improves the interfacial adherence of carbon fibers to epoxy resin, resulting in enhanced interfacial and bending properties of CF and matrix in CF/EP composites, as well as increased interlaminar shear strength and flexural strength.
Article
Polymer Science
Wei-Chung Ke, Jin-Wei Lin, Manohar Reddy Busireddy, Yueh-Hsing Lee, Jiun-Tai Chen, Chain-Shu Hsu
Summary: This study introduces a crosslinkable monomer, TAIC, to synthesize three crosslinked polyimide films, which exhibit improved thermal, mechanical, and dielectric properties. The introduction of TAIC enhances the tensile strength, reduces the dielectric constant and dielectric loss, and decreases the coefficient of thermal expansion of the polyimide films.
Article
Polymer Science
Alex Kwasi Kumi, Ruiling Fan, Ye Chen, Yumei Zhang
Summary: The difference in leaching of amylopectin from cellulose/amylopectin/1-butyl-3-methylimidazolium chloride ([Bmim][Cl]) blends during regeneration in water and aqueous ethanol has been studied. Molecular dynamics simulations showed that the dissolution and regeneration mechanisms of amylopectin in [Bmim][Cl] are similar to cellulose in ionic liquids. Water regeneration leads to weak electrostatic interactions, resulting in high leaching of amylopectin. In contrast, ethanol-water interactions enhance electrostatic interactions among amylopectin chains, limiting amylopectin leaching in aqueous ethanol.
Article
Polymer Science
Xi Zeng, Junwei Zhou, Junbiao Peng, Chunsheng Zhang, Danling Wang, Yihu Song, Qiang Zheng
Summary: This study utilizes an oligomer deep eutectic solvent (DES) based on polyethylene glycol to regulate the vulcanization kinetics of rubber. The results show that the DES can accelerate vulcanization at low temperatures without affecting the crosslinking density and Mullins effect.
Article
Polymer Science
Qianqian Yue, Yongfei Peng, Xingjian Liu, Aihua He, Huarong Nie
Summary: The addition of metal deactivators can effectively suppress the aging of TBIR, prolong its lifespan, and have no negative effects on its physical and processing properties. These research findings are of great importance for improving the stability and aging resistance of polymers.
Article
Polymer Science
J. Gomez-Caturla, J. Ivorra-Martinez, R. Tejada-Oliveros, V Moreno, D. Garcia-Garcia, R. Balart
Summary: This work focuses on the development of environmentally friendly PLA formulations by using different esters derived from geraniol as plasticizers. The results show that these esters have good compatibility with PLA, and they can effectively enhance the elongation and plasticity of PLA, reduce its glass transition temperature, and slightly improve its water absorption capabilities.
Article
Polymer Science
Dandan Li, Zhaohui Lu, Zhao Ke, Ke Xu, Fengna Dai, Youhai Yu, Guangtao Qian, Chunhai Chen
Summary: In this study, cross-linked PI aerogel membranes with low dielectric constant and high moisture resistance were prepared by co-polymerization and scraping coating technology. The incorporation of fluorinated blocks and benzimidazole ring structures resulted in novel PI aerogel membranes with fascinating dielectric properties and outstanding moisture resistance.
Article
Polymer Science
Zhaoyang Chu, Qing Zhang, Haihua Luo, Han Zhou, Fapei Zhang, Wei Chen, Wenhua Zhang
Summary: Multi-physical fields solution processing strategy is a universal and facile method for preparing various conjugated polymer films and high-performance devices. In this study, we employed a combined microfluidic flow and ultrasonication strategy (FU) for processing CP solutions, and found a pronounced synergetic effect in promoting the pre-ordering of chains in solution. The conformation order and anisotropy of the solution were revealed through various characterizations. A non-classical nucleation model for polymer crystallization in non-equilibrium solution processing was confirmed. The roles of microfluidic flow and ultrasonication in chain aggregation and crystallization were addressed through multi-physical simulations. Compared to pristine solutions, the FU strategy showed improved solution anisotropy and crystallization kinetics, resulting in higher crystallinity in films and increased mobilities in OFET devices. The FU processing strategy provides a universal approach for regulating chain conformation and aggregation in conjugated polymer solutions.