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A platform for research: civil engineering, architecture and urbanism
Novel porous membranes with enhanced stability as lithium ion battery separator
With the recent advance in consumer devices such a smartphones, tablets, laptops and power tools, and the future potential growth of the electric vehicle market, energy storage is of global interest, with the Li-ion technology showing the highest potential. Many research groups are working on the development of new materials for electrode materials in hopes of increasing energy density. Less research is committed to separators which are a crucial part in state of the art Li-ion batteries as they prevent contact between anode and cathode and therefore avoid short-circuiting of the battery while at the same time allowing sufficient flow of Li-ions. Especially for electric vehicles, safety is an integral part of the viability of this technology, requiring separators that combine high performance and high mechanical and thermal stability. This work outlines the current state of the art manufacturing process of battery separator membranes as well as the new EVAPORE® process developed by Brückner. The EVAPORE® process is used as a basis for the research presented herein. As this process was previously only possible in large scale on Brückners pilot line, a laboratory method was developed as a quick and cost-effective alternative. Using this method, an in-depth analysis of the morphology of separator membranes and pore formation mechanisms was carried out and is presented herein, deepening the general understanding of the EVAPORE® process. On the basis of the EVAPORE® process, a range of commercial temperature stable polymers were screened for their applicability in the process with the ultimate goal of increasing thermal stability of the separator. To that end, polymers were first evaluated based on their stability in typical battery electrolyte LP71, a requirement for use in modern Li-ion batteries. The most promising candidates were then used in the laboratory method to identify a suitable polymer-solvent combination which was then extruded and processed on a laboratory line and analyzed in terms of their ...
Novel porous membranes with enhanced stability as lithium ion battery separator
With the recent advance in consumer devices such a smartphones, tablets, laptops and power tools, and the future potential growth of the electric vehicle market, energy storage is of global interest, with the Li-ion technology showing the highest potential. Many research groups are working on the development of new materials for electrode materials in hopes of increasing energy density. Less research is committed to separators which are a crucial part in state of the art Li-ion batteries as they prevent contact between anode and cathode and therefore avoid short-circuiting of the battery while at the same time allowing sufficient flow of Li-ions. Especially for electric vehicles, safety is an integral part of the viability of this technology, requiring separators that combine high performance and high mechanical and thermal stability. This work outlines the current state of the art manufacturing process of battery separator membranes as well as the new EVAPORE® process developed by Brückner. The EVAPORE® process is used as a basis for the research presented herein. As this process was previously only possible in large scale on Brückners pilot line, a laboratory method was developed as a quick and cost-effective alternative. Using this method, an in-depth analysis of the morphology of separator membranes and pore formation mechanisms was carried out and is presented herein, deepening the general understanding of the EVAPORE® process. On the basis of the EVAPORE® process, a range of commercial temperature stable polymers were screened for their applicability in the process with the ultimate goal of increasing thermal stability of the separator. To that end, polymers were first evaluated based on their stability in typical battery electrolyte LP71, a requirement for use in modern Li-ion batteries. The most promising candidates were then used in the laboratory method to identify a suitable polymer-solvent combination which was then extruded and processed on a laboratory line and analyzed in terms of their ...
Novel porous membranes with enhanced stability as lithium ion battery separator
Knoche, Thomas (author) / Ulbricht, Mathias
2016-11-29
Theses
Electronic Resource
English
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