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| Preparation of Lithium Battery Separator with Mixed Polyimide Fiber/Dissolving Pulp |
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| DOI：10.11980/j.issn.0254-508X.2019.05.001 |
| Key Words:polyimide fiber dissolving pulp composite separator electrolyte absorption |
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| Abstract:Traditional lithium ion battery separator are polyolefin-based membranes which have low heat resistance.Battery explosion often occurs due to the exothermic reactions during charge-discharge processes.In order to improve the safety level of lithium ion batteries， it is of necessity to prepare separators with high heat resistance and high mechanical strength.In this paper， novel lithium ion battery separators were prepared via a wet-laid papermaking technology from polyimide （PI） fibers and dissolving wood pulp.Results showed that the tensile index， porosity， pore size and electrolyte absorption of polyimide separators were 16.7 N·m/g， 2.8%， 82.7 μm and 440%， respectively， while those of the separators prepared from mixing PI fibers and dissolving pulp （dissdving pulp dosage of 25%） were 17.0 N·m/g， 4.3%， 21.2 μm， 594%， respectively， which were better than those of the former. Dissolving pulp filled the gap between the polyimide fibers and reduced the pore size without affecting the porosity.Dissolving pulp also significantly improved the electrolyte absorption of separators due to its inherent porous and hydrophilic property.The polyolefin（PP） separator was completely melt-shrinked at 200℃ but the size of the PI separator and PI/dissolving pulp composite separator did not change.Therefore， the thermal dimensional stability of the PI separator and PI/dissolving pulp composite separator was much better than that of the conventional polyolefin separator. |
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