Recombinant separator
a technology of recombinant separator and alkaline battery, which is applied in the direction of cell components, cell component details, transportation and packaging, etc., can solve the problems of unsuitable polymethyl methacrylate as battery separator capable of handling high current, and achieve high hydroxyl conductivity, reduced hydrogen buildup in the battery, and high hydrogen transport
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example 1
[0024] 40 grams of microcrystalline cellulose (MCC, Aldrich 31,069-7) is placed in a solution of 2 kg of 5% LiCl / DMAC and heated to 120 degrees Celsius for 15 minutes. The cooled solution affords a clear solution of MCC. 5 grams of ethyl cellulose (EC) is dissolved in 100 ml DMAC separately. The MCC and EC solutions are combined in a 60 / 40 weight ratio by polymer weight. 40 ml of the combined solution is placed on a glass tray. Exposure to ambient moisture at 21 degrees Celsius at 55-60% relative humidity yields a cohesive gel in approximately 2 hours. This gel contains phases of MCC and EC. The gel is then washed with water repeatedly until all DMAC and LiCl are removed. The gel is then dried with a press-dry, affording a film useful as a separator.
[0025] The separator film is tested for hydrogen transport using an assembly containing a mass spectrometer. A cavity whose walls are made of a hydrogen impermeable material is filled with hydrogen on one side is capped with a separator...
example 2
[0030] 20 g of microgranular cellulose (Aldrich C6413) is dissolved in 22 kg of 5% LiCl / DMAC and heated to 130 degrees Celsius for 1 hour. The solution is cooled and then mixed with 5% by weight EC in DMAC in a 60 / 40 weight ratio cellulose / EC. 45 g of solution is cast and gelled with a humidifier over the glass tray. A thermohygrometer close to the tray registered 20 degrees Celsius and 65% relative humidity. After 1 hour, a cohesive gel forms, which is then rinsed to yield a solvent and salt-free gel. The gel is dried under vacuum to yield a separator that is 75 microns in thickness.
example 3
[0031] 20 g. cellulose of powder form (International Filler Corporation) of degree of polymerization 1200 is dissolved in 2 kg of 3% LiCl / DMAC. Cellulose is crosslinked by reacting with NaOH and 1,6 diiodohexane. The resulting cellulose solution is mixed with 4% polyphenyl oxide in DMAC and both solutions are heated to 70 degrees Celsius and then cooled. Solutions are cast onto a conveyor belt and allowed to gel on the conveyor belt. Gel is moved to a different section where it is washed and rinsed along another belt and then taken to a drying drum.
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