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Main Title: Preparation of a Self‐Supported SiO2 Membrane as a Separator for Lithium‐Ion Batteries
Author(s): Kyeremateng, Neil Amponsah
Gukte, Dion
Ferch, Marc
Buk, Jan
Hrebicek, Tomas
Hahn, Robert
Type: Article
Abstract: For the first time, electrophoretic deposition (EPD) has been employed to prepare a self‐supported, inorganic membrane consisting of SiO2 nano‐fibers, as a separator for lithium‐ion batteries. The SiO2 nano‐fibers that were fabricated by a low‐cost force spinning technique were deposited by EPD directly onto LiNi0.8Co0.15Al0.05O2 cathode material. Citric acid charging agent and anhydrous acetone solvent were used. The resulting porosity and tortuosity of the EPD SiO2 separator were 71.42 %, and 1.70, respectively. The slightly higher tortuosity of the EPD‐SiO2‐fiber separator (60 μm) led to a lower rate capability in comparison to commercial GF/A glass fiber separator (260 μm). On the other hand, the latter exhibited lower self‐discharge than the former in full‐cells with a graphite anode; this is proposed to be related to the different purities of the two materials that impart different electronic properties or the presence of 20 wt % PVDF in the EPD‐SiO2 separator. Indeed, the deposited membrane has good characteristics as a battery separator and the EPD process is extremely feasible for the fabrication of miniaturized lithium‐ion batteries on wafer level.
Subject(s): electrophoretic deposition
silica nanofibers
energy storage
Issue Date: 3-Feb-2020
Date Available: 17-May-2021
Language Code: en
DDC Class: 600 Technik, Technologie
Journal Title: Batteries & Supercaps
Publisher: Wiley
Volume: 3
Issue: 5
Publisher DOI: 10.1002/batt.201900169
Page Start: 456
Page End: 462
EISSN: 2566-6223
TU Affiliation(s): Fak. 3 Prozesswissenschaften » Inst. Prozess- und Verfahrenstechnik » FG Verfahrenstechnik
Appears in Collections:Technische Universität Berlin » Publications

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