Electrospun PVDF/PMMA/SiO2 Membrane Separators for Rechargeable Lithium-Ion Batteries

2015 ◽  
Vol 645-646 ◽  
pp. 1201-1206 ◽  
Author(s):  
Xiao Lin Wu ◽  
Jie Lin ◽  
Jian Yan Wang ◽  
Hang Guo
Keyword(s):  
Vinylidene Fluoride ◽  
Lithium Ion ◽  
Electrospun Nanofibers ◽  
Solidification Process ◽  
High Porosity ◽  
Nanofiber Membrane ◽  
Discharge Performance ◽  
Inorganic Particles ◽  
Electrolyte Uptake ◽  
Nanofiber Membranes

In this paper composite nanofiber membranes were prepared by electrospinning technology from poly (vinylidene fluoride) (PVDF)-poly (methyl methacrylate) (PMMA)-SiO2blend solutions with different PMMA and SiO2contents. It was found that the diameter of electrospun nanofibers was greatly increased with the added PMMA content but decreased with the added SiO2content, and when both PMMA and SiO2were added the diameter of electrospun nanofibers was decreased. With a proper ratio of the PMMA and SiO2added, the electrospum nanofiber membrane could have a suitable diameter with high porosity. The XRD results revealed that electrospun nanofiber membranes contained mainly β-phase crystal structure of PVDF, and its crystalline is reduced with the added PMMA and SiO2contents due to the inhibited crystallization of the polymer by the inorganic particles and PMMA during the solidification process. These nanofiber membranes exhibited a high electrolyte uptake, around 300%. Moreover, the incorporation of PMMA and SiO2into the nanofiber membrane improved the ionic conductivity from 1.7×10−3S/cm to 2.0×10−3S/cm at room temperature. Compared with commercial film PE, their cell cycle and charge and discharge performance were also greatly improved.

scholarly journals A Review on Inorganic Nanoparticles Modified Composite Membranes for Lithium-Ion Batteries: Recent Progress and Prospects

Membranes ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 78 ◽  
Author(s):  
Muhammad Rehman Asghar ◽  
Muhammad Tuoqeer Anwar ◽  
Ahmad Naveed ◽  
Junliang Zhang
Keyword(s):  
Lithium Ion Battery ◽  
Mechanical Stability ◽  
Lithium Ion ◽  
Composite Membranes ◽  
Inorganic Nanoparticles ◽  
High Porosity ◽  
Excellent Thermal Stability ◽  
Inorganic Particles ◽  
Inorganic Particle ◽  
Electrolyte Uptake

Separators with high porosity, mechanical robustness, high ion conductivity, thin structure, excellent thermal stability, high electrolyte uptake and high retention capacity is today’s burning research topic. These characteristics are not easily achieved by using single polymer separators. Inorganic nanoparticle use is one of the efforts to achieve these attributes and it has taken its place in recent research. The inorganic nanoparticles not only improve the physical characteristics of the separator but also keep it from dendrite problems, which enhance its shelf life. In this article, use of inorganic particles for lithium-ion battery membrane modification is discussed in detail and composite membranes with three main types including inorganic particle-coated composite membranes, inorganic particle-filled composite membranes and inorganic particle-filled non-woven mates are described. The possible advantages of inorganic particles application on membrane morphology, different techniques and modification methods for improving particle performance in the composite membrane, future prospects and better applications of ceramic nanoparticles and improvements in these composite membranes are also highlighted. In short, the contents of this review provide a fruitful source for further study and the development of new lithium-ion battery membranes with improved mechanical stability, chemical inertness and better electrochemical properties.

scholarly journals Drug Delivery Applications of Core-Sheath Nanofibers Prepared by Coaxial Electrospinning: A Review

Pharmaceutics ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 305 ◽  
Author(s):  
Bishweshwar Pant ◽  
Mira Park ◽  
Soo-Jin Park
Keyword(s):  
Drug Delivery ◽  
Electrospun Nanofibers ◽  
Coaxial Electrospinning ◽  
Burst Release ◽  
High Porosity ◽  
Nanofiber Membrane ◽  
Initial Burst ◽  
Initial Burst Release ◽  
Small Pore ◽  
Drug Delivery Applications

Electrospinning has emerged as one of the potential techniques for producing nanofibers. The use of electrospun nanofibers in drug delivery has increased rapidly over recent years due to their valuable properties, which include a large surface area, high porosity, small pore size, superior mechanical properties, and ease of surface modification. A drug loaded nanofiber membrane can be prepared via electrospinning using a model drug and polymer solution; however, the release of the drug from the nanofiber membrane in a safe and controlled way is challenging as a result of the initial burst release. Employing a core-sheath design provides a promising solution for controlling the initial burst release. Numerous studies have reported on the preparation of core-sheath nanofibers by coaxial electrospinning for drug delivery applications. This paper summarizes the physical phenomena, the effects of various parameters in coaxial electrospinning, and the usefulness of core-sheath nanofibers in drug delivery. Furthermore, this report also highlights the future challenges involved in utilizing core-sheath nanofibers for drug delivery applications.

scholarly journals Tissue Paper-based Composite Separator Using Nano-SiO2 Hybrid Crosslinked Polymer Electrolyte as Coating Layer For Lithium Ion Battery With Superior Security and Cycle Stability

2021 ◽  
Author(s):  
Xinyu Zeng ◽  
Yu Liu ◽  
Rulei He ◽  
Tongyuan Li ◽  
Yuqin Hu ◽  
...  
Keyword(s):  
Lithium Ion Battery ◽  
Vinylidene Fluoride ◽  
Coating Layer ◽  
Lithium Ion ◽  
Cycle Stability ◽  
Crosslinking Degree ◽  
Tissue Paper ◽  
Electrolyte Uptake ◽  
Electrochemical Window ◽  
Composite Separator

Abstract With the development of energy-storage devices, separator is encountered by several challenges including adequate safety, higher current density and superior stability. Tissue paper, composed of packed cellulose fibers, possesses lower production cost, more easily accessibility, superior wettability and outstanding thermostability, thus being prospective as a substrate of high performance separator. To address structure collapse phenomenon occurred in conventional coating layer after long term electrolyte swelling, nano-SiO2 hybrid crosslinked network was constructed on tissue paper through chemical reactions between polymer poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) and hyperbranched polyethyleneimine (PEI) in this work. The influences of crosslinking degree on physical properties and electrochemical performance were studied thoroughly. It can be found that when the crosslinking ratio of PVDF-HFP and PEI fixed at 10:1, the crosslinked composite separator displays excellent electrolyte uptake and wettability, superior ionic conductivity, better interfacial compatibility as well as higher Li+ transference number (0.56), thus offering battery with prominent rate capabilities. Besides, this crosslinked composite separator exhibits satisfying dimensional stability even treated at 250 oC, better flame retardancy, enhanced mechanical behavior, wider electrochemical window and outstanding cycle stability. Accordingly, tissue paper-based crosslinked composite separator can meet higher requirements put forward by high power lithium ion battery.

A high-strength PPESK/PVDF fibrous membrane prepared by coaxial electrospinning for lithium-ion battery separator

2018 ◽  
Vol 31 (8) ◽  
pp. 948-958 ◽  
Author(s):  
Wenzheng Gong ◽  
Xinyu Wang ◽  
Zheng Li ◽  
Junfeng Gu ◽  
Shilun Ruan ◽  
...  
Keyword(s):  
Lithium Ion Battery ◽  
Lithium Ion ◽  
Fibrous Membrane ◽  
Coaxial Electrospinning ◽  
Mechanical And Thermal Properties ◽  
High Porosity ◽  
Hot Press ◽  
Excellent Thermal Stability ◽  
Pvdf Membrane ◽  
Electrolyte Uptake

Electrospinning fibrous membranes have attracted a great deal of attention because of their advantages, including uniform pore size, large ratio surface area, and high porosity. For extended application in lithium-ion battery, it is essential to further improve their electrochemical, mechanical, and thermal properties. In this work, a new poly (phthalazine ether sulfone ketone) (PPESK)/polyvinyli-denefluoride (PVDF) core/shell fibrous membrane was fabricated via the coaxial electrospinning technique, followed by hot press. The PPESK/PVDF membrane hot pressed at 160°C exhibits excellent comprehensive performance, including large porosity (80%), high electrolyte uptake (805%), and excellent thermal stability (at 200°C). Moreover, due to the improved bonding effect derived from the solidification of the PVDF shell layer after the hot press, the mechanical property of the membrane is effectively enhanced. The electrochemical tests also indicate that the PPESK/PVDF membrane shows larger ionic conductivity and lower interfacial resistance when compared with commercial microporous polypropylene separator. In addition, simulated cells assembled with the PPESK/PVDF membrane present superior discharge capacity, stable cycle performance, and excellent rate capability. Therefore, the hot-pressed coaxial PPESK/PVDF fibrous membrane has the potential to be a promising candidate as the separator for high-performance lithium-ion battery.

PEI-SiO2 composite membranes with high thermal stability: Synthesis by self-assembled in situ growth and application in lithium-ion batteries

2020 ◽  
pp. 095400832096455
Author(s):  
Wei Song ◽  
Weiwei Cui ◽  
Xu Wang ◽  
Zeyu Lin ◽  
Wei Deng ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Lithium Ion Batteries ◽  
Composite Membrane ◽  
Retention Rate ◽  
Lithium Ion ◽  
Composite Membranes ◽  
High Porosity ◽  
Electrolyte Uptake ◽  
Electrochemical Window

To improve the safety of lithium-ion batteries (LIBs), a polyether amide–silica (PEI-SiO2) composite membrane was developed by the in situ hydrolysis of tetraethylorthosilicate (TEOS) and its subsequent self-assembly on the surface of PEI fibers. Because of the presence of the SiO2 shell, the PEI-SiO2 composite membrane exhibited good thermal stability at high temperatures. The composite membrane did not change its color and size after heating at 200°C for 1 h as well as exhibited excellent flame retardancy. Moreover, the membrane maintained its high porosity even after the introduction of shell layers. The electrolyte is completely absorbed in the membrane within 0.5 s. The electrolyte uptake was up to 625%, and the ionic conductivity was up to 1.9 mS/cm at room temperature. Compared to the polyolefin membrane and the pure PEI membrane, the PEI-SiO2 composite membrane showed higher electrochemical stability, with an electrochemical window of up to 5.5 V. The battery assembled with the composite membrane showed excellent cycle stability, and the capacity retention rate was as high as 98.6% after 50 cycles. The LIBs based on the PEI-SiO2 composite membrane exhibited safe operation and high electrochemical performance, thus highlighting the applicability of the composite membrane in high-power batteries.

Fabrication of hybrid gel nanofibrous polymer electrolyte for lithium ion battery

2018 ◽  
Vol 32 (19) ◽  
pp. 1840066 ◽  
Author(s):  
Monali V. Bhute ◽  
Subhash B. Kondawar ◽  
Pankaj Koinkar
Keyword(s):  
Lithium Ion Battery ◽  
Polymer Electrolyte ◽  
Ethylene Carbonate ◽  
Gel Polymer Electrolyte ◽  
Rate Capability ◽  
Lithium Ion ◽  
Cycle Performance ◽  
High Porosity ◽  
Hybrid Gel ◽  
Electrolyte Uptake

Fibrous membranes are promising separators for high-performance lithium ion battery because of their high porosity and superior electrolyte uptake. In this paper, the fabrication of hybrid gel polymer electrolyte (HGPE) by introducing SnO2 nanoparticles in poly(vinylidine fluoride) by electrospinning technique and soaking the electrospun nanofibrous membranes in 1 M LiPF6 in ethylene carbonate (EC)/diethyl carbonate (DEC) (1:1, v/v). The as-prepared electrospun HGPE with SnO2 nanofiller was characterized by scanning electron microscopy. The influence of SnO2 on the structure of polymer membrane, physical, and electrochemical properties is systematically investigated. HGPE shows significant high ionic conductivity 4.6 × 10[Formula: see text] S/cm at room-temperature and better cell performance such as discharge C-rate capability and cycle performance. The hybrid gel polymer nanofibrous membrane favors high uptake of lithium electrolyte so that electrolyte leakage is reduced. The gel polymer electrolyte with SnO2 filler was used for the fabrication of Li/PVdF-SnO2/LiFePO4 coin cell. The fabricated cell was evaluated at a current density of 0.2 C-rate and delivered stable and excellent cycle performance. This study revealed that the prepared HGPE can be employed as potential electrolyte for lithium ion batteries.

scholarly journals Electrospun Nanofibers for Chemical Separation

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 982 ◽  
Author(s):  
Mesbah Najafi ◽  
Margaret W. Frey
Keyword(s):  
Chemical Separation ◽  
Electrospun Nanofibers ◽  
Covalent Bonding ◽  
Food Science ◽  
High Porosity ◽  
Light Weight ◽  
Separation And Purification ◽  
Electrospun Nanofiber ◽  
Nanofiber Membranes ◽  
Magnetic Adsorption

The separation and purification of specific chemicals from a mixture have become necessities for many environments, including agriculture, food science, and pharmaceutical and biomedical industries. Electrospun nanofiber membranes are promising materials for the separation of various species such as particles, biomolecules, dyes, and metals from liquids because of the combined properties of a large specific surface, light weight, high porosity, good connectivity, and tunable wettability. This paper reviews the recent progress in the design and fabrication of electrospun nanofibers for chemical separation. Different capture mechanisms including electrostatic, affinity, covalent bonding, chelation, and magnetic adsorption are explained and their distinct characteristics are highlighted. Finally, the challenges and future aspects of nanofibers for membrane applications are discussed.

scholarly journals A Parallel Bicomponent TPU/PI Membrane with Mechanical Strength Enhanced Isotropic Interfaces Used as Polymer Electrolyte for Lithium-Ion Battery

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 185 ◽  
Author(s):  
Ming Cai ◽  
Jianwei Zhu ◽  
Chaochao Yang ◽  
Ruoyang Gao ◽  
Chuan Shi ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Polymer Electrolyte ◽  
Thermoplastic Polyurethane ◽  
Lithium Ion ◽  
High Rate ◽  
High Porosity ◽  
Electrolyte Uptake ◽  
Electrospinning Method ◽  
First Time ◽  
High Rate Performance

In this work, a side-by-side bicomponent thermoplastic polyurethane/polyimide (TPU/PI) polymer electrolyte prepared with side-by-side electrospinning method is reported for the first time. Symmetrical TPU and PI co-occur on one fiber, and are connected by an interface transition layer formed by the interdiffusion of two solutions. This structure of the as-prepared TPU/PI polymer electrolyte can integrate the advantages of high thermal stable PI and good mechanical strength TPU, and mechanical strength is further increased by those isotropic interface transition layers. Moreover, benefiting from micro-nano pores and the high porosity of the structure, TPU/PI polymer electrolyte presents high electrolyte uptake (665%) and excellent ionic conductivity (5.06 mS·cm−1) at room temperature. Compared with PE separator, TPU/PI polymer electrolyte exhibited better electrochemical stability, and using it as the electrolyte and separator, the assembled Li/LiMn2O4 cell exhibits low inner resistance, stable cyclic and notably high rate performance. Our study indicates that the TPU/PI membrane is a promising polymer electrolyte for high safety lithium-ion batteries.

scholarly journals Multilayered PVDF-HFP Porous Separator via Phase Separation and Selective Solvent Etching for High Voltage Lithium-Ion Batteries

Membranes ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 41
Author(s):  
Van-Tien Bui ◽  
Van-Toan Nguyen ◽  
Ngoc-Anh Nguyen ◽  
Reddicherla Umapathi ◽  
Liudmila L. Larina ◽  
...  
Keyword(s):  
Phase Separation ◽  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Vinylidene Fluoride ◽  
Lithium Ion ◽  
High Energy ◽  
Selective Solvent ◽  
Energy Storage Devices ◽  
Electrolyte Uptake ◽  
Highly Porous

The development of highly porous and thin separator is a great challenge for lithium-ion batteries (LIBs). However, the inevitable safety issues always caused by poor mechanical integrity and internal short circuits of the thin separator must be addressed before this type of separator can be applied to lithium-ion batteries. Here, we developed a novel multilayer poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) membrane with a highly porous and lamellar structure, through a combination of evaporation-induced phase separation and selective solvent etching methods. The developed membrane is capable of a greater amount of electrolyte uptake and excellent electrolyte retention resulting from its superior electrolyte wettability and highly porous structure, thereby offering better electrochemical performance compared to that of a commercial polyolefin separator (Celgard). Moreover, benefiting from the layered configuration, the tensile strength of the membrane can reach 13.5 MPa, which is close to the mechanical strength of the Celgard type along the transversal direction. The elaborate design of the multilayered structure allows the fabrication of a new class of thin separators with significant improvements in the mechanical and electrochemical performance. Given safer operation, the developed multilayer membrane may become a preferable separator required for high-power and high-energy storage devices.

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