埃洛石填料对香蒲绒纤维素锂电池隔膜性能的影响

Effects of Halloysite Filler on Properties of Cattail Cellulose Separator for Lithium Battery

为了提高锂电池隔膜的电解液润湿性、孔隙率和力学性能并降低隔膜材料的成本,以天然、廉价的香蒲绒纤维和埃洛石填料复合制备了电池隔膜材料,实验研究了埃洛石填料对隔膜性能的影响。研究结果表明,在本实验范围内,随埃洛石含量增多,香蒲绒纤维素/埃洛石复合隔膜的孔隙尺寸更均匀,隔膜吸液高度越大,拉伸强度增大;但当埃洛石含量过大时,隔膜的力学性能有所下降。香蒲绒纤维素和埃洛石按120∶1的质量比复合时的综合性能最好。相比商用PP-PE-PP隔膜,所制备的香蒲绒纤维素/埃洛石隔膜具有良好拉伸强度、优异的润湿性、更好的电化学性能,采用其组装的锂电池具有更好倍率性能和循环性能,放电比容量达到154 mAh/g。

In order to improve the electrolyte wettability,porosity and mechanical properties of lithium battery membrane and reduce its cost,natural and cheap cattail cellulose compounding with halloysite filler were prepared to make battery membrane.The effects of halloysite filler on the membrane performance were experimentally studied.The results show that with the increase of the content of halloysite at range of experiments,the pore size of the cattail cellulose/halloysite composite membrane is more uniform,and liquid absorption height and tensile strength increase.However,when the content of halloysite is too large,the mechanical property of the membrane decreases.When the mass ratio of cattail cellulose and halloysite is 120∶1,the membrane has the best comprehensive properties.Comparing with commercial PP-PE-PE membrane,the prepared cattail cellulose/halloysite membrane has good tensile strength,excellent wettability and better electrochemical performance.The assembled lithium battery with cattail cellulose/halloysite membrane has better rate performance and cycle performance,and the discharge specific capacity could reach 154 mAh/g.