Synthesis of porous Al₂O₃‐PVDF composite separators and their application in lithium‐ion batteries

Abstract

In this article, a modified tape casting method is employed by dispersing and ball milling of Al 2 O 3 powders in the poly (vinylidene fluoride) polymer, with the aim of developing uniform nanocomposite separators in the lithium-ion cell system. The surface morphology, pore structure, heat-resisting property, infrared property, and cell performance of the nanocomposite separators are investigated. The experimental results indicate that ball milling plays an important role in yielding homogeneous, porous nanocomposite separator membranes. The developed separator membranes exhibit high thermal stability and excellent electrochemical performance, therefore, are promising for use in the lithium-ion cell systems.

Construction of porous coating layer and electrochemical performances of the corresponding modified polyethylene separators for lithium ion batteries

“…Investigators have proposed numerous approaches to enhance polarity of the polyolefin separators, such as surface coating, [4][5][6][7][8][9][10] surface grafting, 11,12 and blending. [13][14][15] On account of the more facile operating process, surface coating is widely adopted. In previous literatures, various materials, such as poly(methyl methacrylate) (PMMA) or its copolymer, 5,6 PMMA/SiO 2 , 7 poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP), 8 and PVDF-HFP/inorganic particles, 9,10 have been coated onto many kinds of common separator.…”

A Highly Stable Separator from an Instantly Reformed Gel with Direct Post‐Solidation for Long‐Cycle High‐Rate Lithium‐Ion Batteries

“…[6][7][8][9] The mechanical properties and ionic conductivity can be improved by modifying the phase-inversion methodw ith additives or pore-forming materials. [6,[15][16][17] In this article, we propose an efficient methodt op repare highly stable PVDF-HFP separators. [6,[15][16][17] In this article, we propose an efficient methodt op repare highly stable PVDF-HFP separators.…”

“…[10][11][12][13][14] However,P VDF-HFP separators prepared through the phase-inversion method still face many restrictions owing to their high cost, complex process, poor mechanical properties, and low long-term stability. [6,[15][16][17] In this article, we propose an efficient methodt op repare highly stable PVDF-HFP separators. Duringt he synthesis of the PVDF-HFPs eparator, N-methyl-2-pyrrolidone (NMP) is incorporated into an already-made, partially dissolved homogenous PVDF-HFPs olution with ac ross-linked structure to form ah ierarchicali nner-bound structure within the PVDF-HFP separator.…”

Functionalized Multiwalled Carbon Nanotube-Reinforced Polyimide Composite Films with Enhanced Mechanical and Thermal Properties

“…Various inorganic fillers owning high thermal conductivity have been added into the PI matrix by in situ polymerization to improve the overall performance of PI, including carbon black [18,19], alumina (Al 2 O 3 ) [20,21], aluminum nitride (AlN) [22,23], silica (SiO 2 ) [24,25], titanium dioxide (TiO 2 ) [26], silicon carbide (SiC) [27,28], silicon nitride (Si 3 N 4 ) [29,30], boron nitride (BN) [31,32], and zinc oxide (ZnO) [33,34]. Compared with the abovementioned inorganic fillers, carbon nanotubes (CNTs) possess high electrical conductivity (10 5 S•cm -1 ) and thermal conductivity (3500 W/mK) and extremely high Young modulus (0.9 TPa) and tensile strength (150 GPa), as well as excellent optical properties [35].…”