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用于热安全隔膜应用的“陶瓷基聚合物”膜

"Polymer-in-Ceramic" Membrane for Thermally Safe Separator Applications.

作者信息

Luo Lin, Gao Zhihao, Zheng Zongmin, Zhang Jianmin

机构信息

College of Mechanical and Electrical Engineering, Power & Energy Storage System Research Center, Qingdao University, Qingdao 266071, China.

National Engineering Research Center for Intelligent Electrical Vehicle Power System (Qingdao), Qingdao 266071, China.

出版信息

ACS Omega. 2022 Sep 28;7(40):35727-35734. doi: 10.1021/acsomega.2c03689. eCollection 2022 Oct 11.

DOI:10.1021/acsomega.2c03689
PMID:36249377
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9557889/
Abstract

In this work, a facile casting method was utilized to prepare "polymer-in-ceramic" microporous membranes for thermally safe battery separator applications; that is, a series of composite membranes composed of silicon dioxide (SiO) as a matrix and polyvinylidene fluoride (PVDF) as a binder were prepared. The effects of different SiO contents on various physical properties of membranes such as the porosity, electrolyte absorption rate, electrochemical stability, and especially thermal stability of the SiO/PVDF composite membranes were systematically studied. Compared with a commercial polypropylene separator, the SiO/PVDF membrane has a higher porosity (66.0%), electrolyte absorption (239%), and ion conductivity (1.0 mS·cm) and superior thermal stability (only 2.1% shrinkage at 200 °C for 2 h) and flame retardancy. When the content of SiO in the membrane reached 60% (i.e., PS6), LiFePO/PS6/Li half-cells exhibited excellent cycle stability (138.2 mA h·g discharging capacity after 100 cycles at 1C) and Coulombic efficiency (99.1%). The above advantages coupled with the potential for rapid and large-scale production reveal that the "polymer-in-ceramic" SiO/PVDF membrane has prospective separator applications in secondary lithium-ion batteries.

摘要

在本工作中，采用一种简便的流延法制备用于热安全电池隔膜应用的“陶瓷基聚合物”微孔膜；即制备了一系列以二氧化硅（SiO₂）为基体、聚偏氟乙烯（PVDF）为粘结剂的复合膜。系统研究了不同SiO₂含量对SiO₂/PVDF复合膜的各种物理性能的影响，如孔隙率、电解液吸收率、电化学稳定性，尤其是热稳定性。与商用聚丙烯隔膜相比，SiO₂/PVDF膜具有更高的孔隙率（66.0%）、电解液吸收率（239%）和离子电导率（1.0 mS·cm⁻¹），以及优异的热稳定性（在200℃下2小时仅收缩2.1%）和阻燃性。当膜中SiO₂含量达到60%（即PS6）时，LiFePO₄/PS6/Li半电池表现出优异的循环稳定性（在1C下100次循环后放电容量为138.2 mA h·g⁻¹）和库仑效率（99.1%）。上述优点以及快速大规模生产的潜力表明，“陶瓷基聚合物”SiO₂/PVDF膜在二次锂离子电池隔膜应用方面具有广阔前景。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2a38/9557889/2f91a17ae9eb/ao2c03689_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2a38/9557889/7586532bc1ed/ao2c03689_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2a38/9557889/9c2220500009/ao2c03689_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2a38/9557889/3f55065d7bc2/ao2c03689_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2a38/9557889/daa3e11ac602/ao2c03689_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2a38/9557889/2f91a17ae9eb/ao2c03689_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2a38/9557889/7586532bc1ed/ao2c03689_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2a38/9557889/9c2220500009/ao2c03689_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2a38/9557889/3f55065d7bc2/ao2c03689_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2a38/9557889/daa3e11ac602/ao2c03689_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2a38/9557889/2f91a17ae9eb/ao2c03689_0006.jpg

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Electroless Formation of a Fluorinated Li/Na Hybrid Interphase for Robust Lithium Anodes.用于坚固锂负极的氟化锂/钠混合界面的无电镀积法
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