Polymer Electrolytes Reinforced by Celgard® Membranes

Abstract

Solid polymer electrolytes have been prepared by encapsulating plasticized polymer electrolytes based on poly(tetraethylene glycol diaerylate) into the pores of Celgard | mieroporous membranes. Electrolyte membranes with thicknesses of ~40 Fm have been prepared. The conductivity of the electrolyte is determined by the porosity of the membrane, and a conductivity of ~2 x I0 -4 ~I ~. cm -~ at room temperature has been demonstrated. These electrolytes showed good compatibility with Li and an electrochemical stability window spanning the range of 0.0 to ~4.5 V vs. Li+~i. The excellent chemical and electrochemical stabilities enabling the use of the membranes in rechargeable Li batteries have been confirmed by the discharge/charge cycling of Li/solid polymer eleetrolyte/LiMn~O4 cells at room temperature.

Electrospinning of Nanomaterials and Applications in Electronic Components and Devices

“…Poly(olefin) microporous membranes are widely used as commercial separators for Li-ion batteries, 16 and although these conventional separators have a number of suitable properties, i.e., chemical stability, tunable thickness, and mechanical strength, 17 their low porosity and poor wettability, resulting from the large polarity difference between non-polar poly(olefin) separator and highly polar liquid electrolyte, lead to increased cell resistance, limiting the performance of Li-ion batteries. 18 Electrospun fiber mats have extremely high specific areas as a result of their high porosity making them a good candidate for battery membranes. By introducing a polar block to diblock polymers, such as sulfonated styrene, the resulting electrospun fiber membranes afford separators with excellent affinity for liquid electrolytes, increasing ionic conductivity and battery performance.…”

Surface-Modified Membrane as A Separator for Lithium-Ion Polymer Battery

“…The impregnation of GPE into the pores of membranes has been performed mostly through dipping method [15,47,48] and in situ polymerization [13,49]. In the dipping method, GPE can be easily impregnated into the small pores of membrane at elevated temperature, and the impregnation of GPE can be conducted by applying the solution of GPE in aprotic solvents onto the microporous membrane, followed by the evaporation of solvents to obtain the GPE-impregnated membrane.…”

“…A number of efforts have been made to achieve high-performance polyolefin separators by coating them with the gel polymer electrolyte (GPE) to improve compatibility with various electrolyte solutions as well as the electrochemical properties of LIPB [13][14][15]. Although these surface-modified polyolefin separators exhibit good mechanical and thermal properties as well as the degree of compatibility with electrolyte solutions, they still have several disadvantages, such as complex multi-step processes and relatively expensive modification of the surface of hydrophobic polyolefin separators with adequate hydrophilic monomers to increase the surface energy enough to absorb the electrolyte solutions.…”

Electrochemical and Safety Performances of Polyimide Nano fiber-based Nonwoven Separators for Li-ion Batteries

“…But, they exhibit poor compatibility with liquid electrolytes due to their hydrophobic property, and their manufacturing cost is high. Many studies of coating on the PE separators with a gel electrolyte have been undertaken to enhance their compatibility with liquid electrolytes [15][16][17][18]. The rate capabilities of the separators are not enough for high-power applications, such as electric vehicles, hybrid electric vehicles and robots.…”