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非对称涂层LAGP/PP/PVDF-HFP复合隔膜及其对改善NCM电池性能的作用。

Asymmetrically coated LAGP/PP/PVDF-HFP composite separator film and its effect on the improvement of NCM battery performance.

作者信息

Liang Tian, Cao Jian-Hua, Liang Wei-Hua, Li Quan, He Lei, Wu Da-Yong

机构信息

Technical Institute of Physics and Chemistry, Chinese Academy of Science 29 zhongguancun east road, Haidian District Beijing 100190 P. R. China

University of Chinese Academy of Science Beijing 100049 P. R. China.

出版信息

RSC Adv. 2019 Dec 12;9(70):41151-41160. doi: 10.1039/c9ra09200e. eCollection 2019 Dec 9.

DOI:10.1039/c9ra09200e
PMID:35540032
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9076374/
Abstract

LiAlGe(PO) (LAGP) is an inorganic solid electrolyte with a Na superionic conductor (NASICON) structure that provides a channel for lithium ion transport. We coated LAGP particles on one side of a polypropylene (PP) separator film to improve the ionic conductivity of the separator, and water-dispersed polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) on the other side to reduce the interfacial resistance between the separator and the lithium metal anode. The results show that the LAGP/PP/PVDF-HFP separator has a high ionic conductivity (1.06 mS cm) at room temperature (PP separator: 0.70 mS cm), and an electrochemical window of 5.2 V ( Li/Li). The capacity retention of a NCM|LAGP/PP/PVDF-HFP|graphite full cell is 81.0% after 300 charge-discharge cycles at 0.2C. When used in a NCM|LAGP/PP/PVDF-HFP|Li half-cell system, the initial discharge capacity is 172.5 mA h g at 0.2C, and the capacity retention is 83.2% after 300 cycles. More significantly, the surface of the Li anode is smooth and flat after 200 cycles. The interface resistance increased from 7 to 109 Ω after 100 cycles at 0.2C. This indicates that the synergistic effect of the asymmetric coated LAGP and PVDF-HFP is beneficial to inhibiting the growth of lithium dendrites in the battery and reduces the interface resistance.

摘要

锂铝锗（磷酸）（LAGP）是一种具有钠超离子导体（NASICON）结构的无机固体电解质，为锂离子传输提供通道。我们在聚丙烯（PP）隔膜的一侧涂覆LAGP颗粒以提高隔膜的离子电导率，在另一侧涂覆水分散的聚偏氟乙烯-六氟丙烯（PVDF-HFP）以降低隔膜与锂金属负极之间的界面电阻。结果表明，LAGP/PP/PVDF-HFP隔膜在室温下具有高离子电导率（1.06 mS/cm，PP隔膜为0.70 mS/cm）以及5.2 V（Li/Li）的电化学窗口。NCM|LAGP/PP/PVDF-HFP|石墨全电池在0.2C下进行300次充放电循环后的容量保持率为81.0%。当用于NCM|LAGP/PP/PVDF-HFP|Li半电池系统时，在0.2C下的初始放电容量为172.5 mA h/g，300次循环后的容量保持率为83.2%。更显著的是，锂负极在200次循环后表面光滑平整。在0.2C下100次循环后，界面电阻从7增加到109Ω。这表明不对称涂覆的LAGP和PVDF-HFP的协同效应有利于抑制电池中锂枝晶的生长并降低界面电阻。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34cb/9076374/ead1fc846fee/c9ra09200e-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34cb/9076374/4709edff6695/c9ra09200e-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34cb/9076374/50a60b6883de/c9ra09200e-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34cb/9076374/609e3062df31/c9ra09200e-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34cb/9076374/ac89156392cf/c9ra09200e-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34cb/9076374/0925cd5b39f0/c9ra09200e-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34cb/9076374/b552a305a3e8/c9ra09200e-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34cb/9076374/283b5df3946f/c9ra09200e-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34cb/9076374/e07ce06d12b2/c9ra09200e-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34cb/9076374/ead1fc846fee/c9ra09200e-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34cb/9076374/4709edff6695/c9ra09200e-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34cb/9076374/50a60b6883de/c9ra09200e-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34cb/9076374/609e3062df31/c9ra09200e-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34cb/9076374/ac89156392cf/c9ra09200e-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34cb/9076374/0925cd5b39f0/c9ra09200e-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34cb/9076374/b552a305a3e8/c9ra09200e-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34cb/9076374/283b5df3946f/c9ra09200e-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34cb/9076374/e07ce06d12b2/c9ra09200e-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/34cb/9076374/ead1fc846fee/c9ra09200e-f9.jpg

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