EVOH-SO<sub>3</sub>Li/PET电纺锂离子电池隔膜电化学性能

doi:10.11868/j.issn.1001-4381.2016.000232

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摘要

采用聚对苯二甲酸乙二醇酯（PET）与乙烯-乙烯醇共聚物的磺化物（EVOH-SO₃Li）进行交替静电纺丝，制备EVOH-SO₃Li/PET复合锂离子电池隔膜，通过扫描电子显微镜对隔膜的微观形貌进行观察，并利用IM6型电化学工作站对隔膜的电化学性能进行分析测试。结果表明：EVOH-SO₃Li/PET纤维膜的平均直径为387nm，两种纤维均呈现均匀的网状结构。相比纯EVOH-SO₃Li纤维，改性后EVOH-SO₃Li/PET复合纤维之间粘连现象明显降低，且纤维表面更加光滑，纤维间孔隙增大；组装的锂离子电池的电化学稳定窗口为5.3V，界面阻抗降至212.31Ω，离子电导率则提高至2.347×10^-3S/cm，与EVOH-SO₃Li隔膜相比各项性能均有所提高。

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	巩桂芬
	王磊
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关键词 ：锂离子电池隔膜, 聚对苯二甲酸乙二醇酯, EVOH-SO₃Li, 静电纺丝, 电化学性能

Abstract：

EVOH-SO₃ Li/PET Li-ion battery composite membranes were prepared by means of alternated electrostatic spinning, then the morphology of the membranes was observed by scanning electron microscope, and the electrochemical properties of the membranes were tested by using an electrochemistry work station. The results show that the average diameter of EVOH-SO₃ Li/PET fibre is 387nm, both two kinds of fibres exhibit uniform net-like structure. Compared with pure EVOH-SO₃ Li fibre, adhesion phenomenon of modified EVOH-SO₃ Li/PET fibre is not obvious anymore, and the surface of EVOH-SO₃ Li/PET fibre becomes more smooth with enlarged pores between adjacent fibres; the electrochemical window of EVOH-SO₃ Li/PET separator is 5.3V, bulk resistance of EVOH-SO₃ Li/PET is decreased to 212.31Ω, and the ion conductivity of EVOH-SO₃ Li/PET separator is 2.347×10^-3 S/cm, the properties of EVOH-SO₃ Li/PET membranes are improved compared with EVOH-SO₃ Li.

Key words： lithium-ion battery separator PET EVOH-SO₃Li electrostatic spinning electrochemical property

收稿日期: 2016-03-02 出版日期: 2018-03-20

中图分类号:

TQ340.64

通讯作者: 巩桂芬 E-mail: ggf-hust@163.com

作者简介: 巩桂芬(1966-), 女, 教授, 硕士生导师, 主要从事纳米纤维素改性和锂离子电池隔膜的研究, 联系地址:黑龙江省哈尔滨市香坊区林园路4号(150040), E-mail: ggf-hust@163.com

引用本文:

巩桂芬, 王磊, 兰健. EVOH-SO₃Li/PET电纺锂离子电池隔膜电化学性能[J]. 材料工程, 2018, 46(3): 7-12.
Gui-fen GONG, Lei WANG, Jian LAN. Electrochemical Properties of EVOH-SO₃Li/PET Lithium Ion Battery Separator via Electrospinning. Journal of Materials Engineering, 2018, 46(3): 7-12.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.000232 或 http://jme.biam.ac.cn/CN/Y2018/V46/I3/7

Fig.1 电纺隔膜的红外谱图

Fig.2 电纺隔膜的SEM图
(a)EVOH-SO₃Li；(b)EVOH-SO₃Li/PET

Fig.3 电纺隔膜的孔径分布图
(a)EVOH-SO₃Li；(b)EVOH-SO₃Li/PET

Table 1 电纺隔膜的基本物理性能

Fig.4 电纺隔膜的电化学稳定窗口

Fig.5 电纺隔膜的界面阻抗谱图

Fig.6 电纺隔膜的交流阻抗谱图

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