Page 102 - 精细化工2019年第10期

第 36 卷第 10 期 精 细 化 工 Vol.36, No.10
2019 年 10 月 FINE CHEMICALS Oct. 2019

电子化学品
静电纺 PPEK/SiO 锂离子电池隔膜的制备及性能
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刘落恺 ，唐 萍 ，李隆伟 ，蹇锡高 1,2 ，宾月珍 1,2*
（1. 大连理工大学 化工学院 高分子材料系，辽宁 大连 116024；2. 精细化工国家重点实验室，辽宁 大
连 116024）

摘要：为制备吸液率高、热尺寸稳定性良好的隔膜，以聚芳醚酮（PPEK）和 SiO 2 为原料，采用静电纺丝技术
制备了 PPEK/SiO 2 复合纤维膜。通过 SEM、电化学工作站、蓝电电池测试系统等对电纺纤维膜及组装的电池进
行了结构表征和性能测试，讨论了 SiO 2 质量分数对电纺纤维膜结构和性能的变化规律，并考察了其作为锂离子
电池隔膜用时的电化学和电池性能。结果表明：随着 SiO 2 质量分数的增加，电纺纤维膜的孔隙率、吸液率和离
子电导率逐渐增加。电纺纤维膜在 200 ℃下热处理 1 h 的热收缩率为 0，具有良好的热尺寸稳定性。当 SiO 2 质
–3
量分数为 6%（以 PPEK 质量为基准）时，孔隙率和吸液率分别达到 179%、1031%，离子电导率为 2.63×10 S/cm；
将该电纺纤维膜组装成石墨/Li 电池，1 C 下放电比容量为 332~350 mA·h/g，具有良好的循环和倍率性能。
关键词：锂离子电池；隔膜；静电纺丝；聚芳醚酮（PPEK）；二氧化硅；热尺寸稳定性
中图分类号：TQ152；TQ340.64 文献标识码：A 文章编号：1003-5214 (2019) 10-2068-07

Preparation and Properties of PPEK/SiO 2 Electrospun Membranes as
Lithium Ion Battery Separators

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LIU Luo-kai , TANG Ping , LI Long-wei , JIAN Xi-gao , BIN Yue-zhen 1,2*
（1. School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China; 2. State Key
Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, Liaoning, China）
Abstract: In order to prepare a separator with high electrolyte uptake and good thermal dimensional
stability, poly (phthalazinone ether ketone) (PPEK)/SiO 2 electrospun membranes were prepared by
electrospinning technology. The structures and properties of electrospun membranes and batteries were
tested by SEM, electrochemical workstation, LAND battery cycle system and so on. The structures and
thermal properties of the electrospun membranes with different SiO 2 content were studied. The electrospun
membranes were used as separators to assemble lithium ion batteries, and the electrochemical performances
and battery performances were measured. The results showed that the electrospun membranes' porosity,
electrolyte uptake, ionic conductivity increased gradually with the increase of SiO 2 content. The thermal
shrinkage rate of PPEK electrospun membranes were 0, when heat treated at 200 ℃ for 1 h, indicating that
these membranes displayed good thermal dimensional stability. When the mass fraction of SiO 2 was 6%
(based on the mass of PPEK), the porosity and electrolyte uptake of the prepared membrane reached 179%
–3
and 1031%, and ionic conductivity was 2.63×10 S/cm. Moreover, this electrospun membrane was used as
a separator of lithium ion battery, the battery exhibited better cycle performance and excellent capacity
retention with a discharge capacity of 332~350 mA·h/g at 1 C.
Key words: lithium ion battery; separator; electrospinning; poly (phthalazinone ether ketone) (PPEK);
silicon dioxide; thermal dimensional stability

锂离子电池是一种高效、清洁的能源储备系统， 到广泛关注 [1-3] 。隔膜是锂离子电池的重要组成部
因高能量密度、低自放电率、环境友好等优点而受 分，其性能影响电池的容量、使用寿命及安全问题

收稿日期：2019-01-11; 定用日期：2019-04-08; DOI: 10.13550/j.jxhg.20190037
基金项目：国家自然科学基金（U1663226，21374014）
作者简介：刘落恺（1994—），女，硕士生，E-mail：358541787@qq.com。联系人：宾月珍（1966—），女，教授，E-mail：binyz@dlut.edu.cn。