Boehmite-based ceramic separator for lithium-ion batteries

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• 作者：J. Holtmann ; M. Schäfer ; A. Niemöller ; M. Winter…
• 关键词：Composite membrane ; Ceramic separator ; Boehmite ; MacMullin number ; Dimensional stability ; C ; rate capability ; Lithium ; ion batteries
• 刊名：Journal of Applied Electrochemistry
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：46
• 期：1
• 页码：69-76
• 全文大小：1,276 KB
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• 作者单位：J. Holtmann (1)
  M. Schäfer (2)
  A. Niemöller (2)
  M. Winter (1) (3)
  Alexandra Lex-Balducci (1)
  Shahmahmood Obeidi (1)
  
  1. MEET Battery Research Center, Institute for Physical Chemistry, University of Münster, Corrensstraße 46, 48149, Münster, Germany
  2. Sihl GmbH, Kreuzauer Str. 33, 52355, Düren, Germany
  3. Helmhotz Institute Münster “Ionics in Energy Storage”, Corrensstraße 80, 48149, Münster, Germany
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Electrochemistry
  Physical Chemistry
  Industrial Chemistry and Chemical Engineering
  
• 出版者：Springer Netherlands
• ISSN：1572-8838

文摘

A free-standing ceramic separator for lithium-ion batteries based on synthesized and surface-functionalized boehmite nanoparticles (AlO(OH)) was prepared by means of a pilot coating machine. For this composite membrane, polyvinylidene difluoride (PVdF) homopolymer was used as a binder. The separator displays a homogeneous morphology with a thickness of 22 µm. The mean pore size of the separator is 64 nm and the MacMullin number is 5.1. The constant current cycling behavior and C-rate capability up to 5 C are comparable to those of a commercial tri-layer polyolefin separator. Even though the mechanical properties of the ceramic separator are in some regards comparable to those of the polyolefin separator, however, they need to be improved so that the ceramic separator is able to withstand the stressful cell assembly process. Moreover, the boehmite-based ceramic separator displays a superior wettability and thermal stability compared to state-of-the-art polyolefin separators and is, therefore very promising for application in lithium-ion batteries.