基于静电纺丝和静电喷射技术的P(VDF-HFP)/Al2O3/P(VDF-HFP)复合隔膜的制备与电化学性能分析

doi:10.7503/cjcu20160838

高等学校化学学报 ›› 2017, Vol. 38 ›› Issue (6): 1018.doi: 10.7503/cjcu20160838

• 中国第四届静电纺丝大会专题研究论文 • 上一篇下一篇

基于静电纺丝和静电喷射技术的P(VDF-HFP)/Al₂O₃/P(VDF-HFP)复合隔膜的制备与电化学性能分析

周锦涛¹, 焦晓宁^1,²(), 于宾¹, 任元林^1,², 康卫民^1,²

1. 天津工业大学纺织学院, 天津 300387
2. 天津工业大学先进复合材料教育部重点实验室, 天津 300387

收稿日期:2016-11-28 出版日期:2017-06-10 发布日期:2017-05-23
作者简介:联系人简介: 焦晓宁, 女, 博士, 教授, 主要从事功能非织造布材料方面的研究. E-mail: xiao_ningjiao@163.com
基金资助:
天津市科技计划项目(批准号: 13JCZDJC32500, 14TXGCCX00014)资助.

Preparation and Electrochemical Characterization of P(VDF-HFP)/Al₂O₃/P(VDF-HFP) Membranes for LIBs by Electrospinning and Electrospraying

ZHOU Jintao¹, JIAO Xiaoning^1,^2,^*(), YU Bin¹, REN Yuanlin^1,², KANG Weimin^1,²

1. School of Textile, Tianjin Polytechnic University, Tianjin 300387, China
2. Key Laboratory of Advanced Textile Composite, Ministry of Education,Tianjin Polytechnic University, Tianjin 300387, China

Received:2016-11-28 Online:2017-06-10 Published:2017-05-23
Contact: JIAO Xiaoning E-mail:xiao_ningjiao@163.com
Supported by:
This paper is supported by the Project of Tianjin Science and Technology Plan, China(Nos.13JCZDJC32500, 14TXGCCX00014).

摘要/Abstract

摘要：

通过静电纺丝和静电喷射技术, 将三氧化二铝(Al₂O₃)纳米颗粒沉积在两层聚四氟乙烯六氟丙烯[P(VDF-HFP)]静电纺丝隔膜之间, 制备出了具有“三明治”结构的P(VDF-HFP)/Al₂O₃/P(VDF-HFP)复合锂离子电池隔膜. 分析了隔膜的形态结构、热收缩性能、拉伸性能、电化学性能以及隔膜在电池中的循环性能. 测试结果表明, 该复合隔膜比纯P(VdF-HFP)膜拥有更高的吸液率, 隔膜更容易吸收电解液从而形成凝胶聚合物电解质(GPEs). 该复合隔膜的拉伸强度在4 MPa左右, 相对应的断裂伸长率为261.57%. 复合隔膜在室温下的离子电导率为1.61×10^-3 S/cm, 且表现出了较高的电化学稳定性(电化学稳定窗口达到5.4 V). 在电池的循环测试中, 使用钴酸锂(LiCoCO₂)作为正极材料, 由该复合隔膜组装的电池的首次放电比容量达到了理想的水平, 为145 mA·h·g^-1.

关键词: 锂离子电池, 凝胶聚合物电解质, 静电纺丝, 静电雾化沉积

Abstract:

A novel sandwiched composite membrane(SCM) was prepared by depositing alumina micro-particles between two layers of electrospun poly(vinylidene fluoride-co-hexafluor-opropylene)[P(VDF-HFP)] nanofibers through electrostatic spray deposition. The morphologies, thermal shrinkage, tensile properties and electrochemical properties of the separator and battery performance for cells made with the SCM were investigated. The results show a higher uptake of electrolyte for the SCM than the pure P(VDF-HFP) membrane(PHM). SCM can easily absorb the electrolyte to form gel polymer electrolytes(GPEs). The tensile strength of the SCM membrane is about 4.00 MPa when the elongation at break is 261.57%. The ionic conductivity of SCM GPEs is 1.61×10^-3S/cm at room temperature and GPE shows a high electrochemical stability potential of 5.4 V. With LiCoCO₂ as the cathode, the cell with SCM GPEs exhibits a high initial discharge capacity of 145 mA·h·g^-1.

Key words: Lithium ion battery(LIB), Gel polymer electrolyte(GPE), Electrospin, Electrostatic spray deposition

中图分类号:

O631
TS176

TrendMD:

周锦涛, 焦晓宁, 于宾, 任元林, 康卫民. 基于静电纺丝和静电喷射技术的P(VDF-HFP)/Al₂O₃/P(VDF-HFP)复合隔膜的制备与电化学性能分析. 高等学校化学学报, 2017, 38(6): 1018.

ZHOU Jintao, JIAO Xiaoning, YU Bin, REN Yuanlin, KANG Weimin. Preparation and Electrochemical Characterization of P(VDF-HFP)/Al₂O₃/P(VDF-HFP) Membranes for LIBs by Electrospinning and Electrospraying. Chem. J. Chinese Universities, 2017, 38(6): 1018.

图/表 9

Fig.1 Scheme of the preparation of the sandwiched composite membrane(SCM)(A) Outer P(VDF-HFP) layer; (B) P(VDF-HFP)/Al2O3 layers; (C) P(VDF-HFP)/Al2O3/P(VDF-HFP) layers

Fig.2 SEM photographs of the composite membrane (A) Cross-section; (B) outer layer; (C) inner layer.

Fig.3 Photographs of the membranes before and after thermal treatment

Fig.4 Tensile properties of SCM(a) and PHM(b) membranes

Fig.5 Electrochemical impedance spectra of SCM(a) and PHM(b) GPEs

Fig.6 Electrochemical stability of PHM(a) and SCM(b) GPEs

Fig.7 Variation of the AC impedance behavior of PHM(a) and SCM(b) GPEs

Fig.8 Initial charge-discharge curves for the cells with PHM(a) and SCM(b) GPEs

Fig.9 Cycle performance for the cells with PHM(a) and SCM(b) GPEs

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基于静电纺丝和静电喷射技术的P(VDF-HFP)/Al₂O₃/P(VDF-HFP)复合隔膜的制备与电化学性能分析

Preparation and Electrochemical Characterization of P(VDF-HFP)/Al₂O₃/P(VDF-HFP) Membranes for LIBs by Electrospinning and Electrospraying

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