PET基陶瓷隔膜的制备及性能研究

doi:10.15541/jim20160159

无机材料学报 ›› 2016, Vol. 31 ›› Issue (12): 1301-1305.DOI: 10.15541/jim20160159

PET基陶瓷隔膜的制备及性能研究

谢晓华¹, 李晓哲^{1, 2}, 李为标^{1, 3}, 邵光杰², 夏保佳¹

(1. 中国科学院上海微系统与信息技术研究所, 上海201800; 2. 燕山大学环境与化学工程学院, 河北省应用化学重点实验室, 秦皇岛066004; 3. 上海大学理学院, 化学系, 上海201900)

收稿日期:2016-03-21 修回日期:2016-03-28 出版日期:2016-12-16 网络出版日期:2016-11-23
作者简介:谢晓华(1979–), 女, 副研究员. E-mail: xiaohuaxie@126.com
基金资助:
上海市基础研究重点项目(12JC1410000);国家自然科学基金(21303245);Key Basic Research Programs of Science and Technology Commission of Shanghai Municipality (12JC1410000);National Natural Science Foundation of China (21303245)

Fabrication and Performance of PET-ceramic Separators

XIE Xiao-Hua¹, LI Xiao-Zhe^{1, 2}, LI Wei-Biao^{1, 3}, SHAO Guang-Jie², XIA Bao-Jia¹

(1. Shanghai Institute of Microsystem And Information Technology, Chinese Academy of Sciences , Shanghai 201800, China; 2. Hebei Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China; 3. Department of Chemistry, Shanghai University, Shanghai 201900, China)

Received:2016-03-21 Revised:2016-03-28 Published:2016-12-16 Online:2016-11-23
About author:XIE Xiao-Hua. E-mail: xiaohuaxie@126.com

摘要/Abstract

摘要：

以聚偏氟乙烯-六氟丙烯共聚物(PVDF-HFP)为粘结剂, 用浸涂法在对苯二甲酸乙二醇酯(PET)隔膜上同时涂覆不同粒径的SiO₂和Al₂O₃, 使PET的大孔得到更有效的填充, 充分发挥了两种陶瓷及其粒径的各自优势。系统考察了SiO₂与Al₂O₃相对含量对陶瓷隔膜的表面形貌、孔隙率、吸液率、热稳定性、离子电导率和电化学阻抗谱(EIS)的影响。研究了SiO₂/Al₂O₃为3/7(wt%)的陶瓷隔膜组装成MCMB/LiNi_1/3Co_1/3Mn_1/3O₂电池的电化学性能, 并与商业聚丙烯(PP)隔膜对比。结果表明: 该陶瓷隔膜具有更好的综合性能, 100次循环后的容量保持率为93.9%, 10C电流下仍具有82.7 mAh/g的容量, 优于商业PP隔膜。

关键词: PET, 陶瓷隔膜, 热稳定性, 电化学性能

Abstract:

Ceramic-coating separators were prepared with poly(ethylene terephthalate) (PET) nonwoven membrane as the substrate. Different particle sizes and variable ratios of SiO₂ and Al₂O₃ were coated on the PET surface by dip coating technology, using PVDF-HFP as the binder. The separators took advantage of both kinds of ceramic particles, so that the big pores of PET were filled more effectively. Surface morphology, porosity, electrolyte wettability, thermal stability, ionic conductivity, and electrochemical impedance spectroscope (EIS) of composite separators with different ratios of SiO₂to Al₂O₃ were systematically investigated, and separators with ratio of SiO₂/Al₂O₃=3/7 showed superior performance. Electrochemical properties of MCMB / LiNi_1/3Co_1/3Mn_1/3O₂2025-type coin cells assembled by the ceramic separators with ratio of SiO₂/Al₂O₃=3/7 were also tested, as compared with commercialized PP separators. The results demonstrated that the ceramic separators performed with 93.9% capacity retention after 100 cycles and capacity of 82.7 mAh/g at 10C rate, better than PP separators.

Key words: PET, ceramic separator, thermal stability, electrochemical properties

中图分类号:

TM912

谢晓华, 李晓哲, 李为标, 邵光杰, 夏保佳. PET基陶瓷隔膜的制备及性能研究[J]. 无机材料学报, 2016, 31(12): 1301-1305.

XIE Xiao-Hua, LI Xiao-Zhe, LI Wei-Biao, SHAO Guang-Jie, XIA Bao-Jia. Fabrication and Performance of PET-ceramic Separators[J]. Journal of Inorganic Materials, 2016, 31(12): 1301-1305.

图/表 7

图1 (a) S-0、(b)S-1、(c)S-2、(d)S-3和(e)S-4PET基陶瓷隔膜的SEM照片

Fig. 1 SEM images of PET-ceramic separator^(a) S-0; (b) S-1; (c) S-2; (d) S-3; (e) S-4

图2 PET基陶瓷隔膜及PP隔膜的孔隙率(a)、吸液率(b)和离子电导率(c)

Fig. 2 Porosity (a), electrolyte wettability (b), ionic conductivity (c) of PET-ceramic separator and PP separator

图3 S-1隔膜和PP膜的热稳定性

Fig. 3 Thermal stability of S-1 separator and PP separator

图4 S-1隔膜和PP隔膜的LSV曲线

Fig. 4 LSV curves of S-1 separator and PP separator

图5 S-1隔膜和PP隔膜组装电池的自放电曲线

Fig. 5 Self-discharge curves of cells fabricated with S-1 separator and PP separator

图6 S-1隔膜和PP隔膜电池的倍率(a)和循环(b)性能

Fig. 6 Rate capacity (a) and cycle performance (b) of cells fabricated with S-1 separator and PP separator

图7 S-1隔膜和PP隔膜电池的电化学阻抗谱

Fig. 7 Electrochemical impedance spectroscopy of cells fabricated with S-1 separator and PP separator

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PET基陶瓷隔膜的制备及性能研究

Fabrication and Performance of PET-ceramic Separators

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