Celgard® membrane

Gancarz, L, Bryjak, M., Kunicki, J. and Ciszewski, A. 2010. Microwave plasma-initiated grafting of acrylic acid on Celgard 2500 membrane to prepare alkaline battery separators -Characteristics of process and product. J. Appl. Polym. Sci. 116 868-875. 

A method using staining and ultramicrotomy (Section 4.4.2) has been demonstrated that shows the three dimensional structure of microporous membranes. such as Celgard 2500 membrane (trademark, Celanese Corp., New York [131]. Celgard is formed by film extrusion, annealing... 

Better mechanical stability can be expected from irradiated polyethylene or mi-croporous polypropylene ( Celgard ) membranes, but these account for increased electrical resistance values. 

Hoechst Celanese Corp. Tonen Corp. Asahi Chemical Industries Mitsubishi Ube Industries Ltd. Pall RAI Celgard membranes made of polypropylene, polyethylene, and combinations Setela membranes made of polyethylene HiPore membranes made of polyethylene Exepol membranes made of polyethylene Polypropylene membranes Polyethylene membranes... 

Dasgupta and Jacobs [29] patented a concept of using a gel layer in combination with a microporous membrane. The gel layer acts as an adhesive bridge between separator and electrodes, just as in the flat pack Zn/MnC cell [30], The microporous membrane (for example, Celgard membrane) provides excellent mechanical... 

The key properties of separators are summarized in Table 2. Table 3 gives some typical values for Celgard membranes. Currently, 25 im is the most widely... 

The hot-ER test refers to measuring the impedance of a separator while the temperature is linearly increased this technique was first used by Laman et al. [5]. Figure 4 shows actual measurements for some Celgard membranes [20], The single-layer materials exhibit a sharp rise in impedance near their respective melting points the impedance goes back down after a maximum value has been reached. 

The simulated short-circuit test was developed to characterize the response of the separator to a short circuit without the complications of battery electrodes. The separator was spirally wound between lithium foils and placed in an AA-size can. To avoid lithium dendrite formation, an alternating voltage was applied to the cell. The cell current and can temperature were monitored. Figure 6 shows the behavior of Celgard membranes. 

It has been shown for Celgard membranes that the membrane resistance can be related to the gurley number by ... 

Image analysis has been used to characterize the pore structure of synthetic membrane materials. The Celgard films have also been characterized by scanning tunneling microscopy, atomic force microscopy, and field emission scanning electron microscopy. The pore size of the Celgard membranes can also be calculated from eq 5, once the MacMullin number and gurley values are known. 

Microporous Celgard membrane containing a solution of LIX64N, an oxime carrier agent... 

Membrane extractors Celgard membrane High throughput—no DiMiding Emulsion not formed Chemical compatibility may be a problem Can ojKTate very low liquid rale... 

Figure 6.9 shows the TMA data for two different Celgard membranes. The shrinkage onset temperature, deformation temperature, and rupture temperature are... 

Hoechst Celanese Corp. Celgard membranes made of polypropylene, polyethylene, and combinations... 

Figure IV - 26. Pore size distribution of a celgard membrane as determined by liquid displacement [21].

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