{"title":"Tuneable and efficient manufacturing of Li-ion battery separators using photopolymerization-induced phase separation","authors":"Samuel Emilsson, Göran Lindbergh, Mats Johansson","doi":"10.1039/d4ta03701d","DOIUrl":null,"url":null,"abstract":"In an effort to increase the thermomechanical stability of lithium-ion battery separators, thermoset membranes (TM) are a viable alternative to commercial polyolefin separators. We present an efficient and scalable method to produce thin TMs via photopolymerization-induced phase separation (PIPS) in ambient conditions. The pore size is controllable and tuneable by varying the ratio between propylene carbonate (PC) and tetraethylene glycol (TEG) as porogens. The TMs maintain dimensional stability above 200 ○C and sufficient mechanical stiffness. By incorportating a small amount of a thiol monomer, the brittleness of the TMs was supressed, and a high Young’s modulus is achieved (880 MPa). The ionic conductivity of the optimized TMs were around 1 mS cm-2, with a low MacMullin number, NM (4.9). In symmetrical Li/Li cells, the TMs behaved similar to the commerical PE reference, effectively supressing short circuits for 1000+ hours although continous overpotential build up and electrolyte consumption eventually led to cell failure. In LiFePO4/Li half-cells, similar rate capabilities were achieved for the TMs compared to the reference showing its viability as a separator material.","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":null,"pages":null},"PeriodicalIF":10.7000,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Materials Chemistry A","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1039/d4ta03701d","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
In an effort to increase the thermomechanical stability of lithium-ion battery separators, thermoset membranes (TM) are a viable alternative to commercial polyolefin separators. We present an efficient and scalable method to produce thin TMs via photopolymerization-induced phase separation (PIPS) in ambient conditions. The pore size is controllable and tuneable by varying the ratio between propylene carbonate (PC) and tetraethylene glycol (TEG) as porogens. The TMs maintain dimensional stability above 200 ○C and sufficient mechanical stiffness. By incorportating a small amount of a thiol monomer, the brittleness of the TMs was supressed, and a high Young’s modulus is achieved (880 MPa). The ionic conductivity of the optimized TMs were around 1 mS cm-2, with a low MacMullin number, NM (4.9). In symmetrical Li/Li cells, the TMs behaved similar to the commerical PE reference, effectively supressing short circuits for 1000+ hours although continous overpotential build up and electrolyte consumption eventually led to cell failure. In LiFePO4/Li half-cells, similar rate capabilities were achieved for the TMs compared to the reference showing its viability as a separator material.
期刊介绍:
The Journal of Materials Chemistry A, B & C covers a wide range of high-quality studies in the field of materials chemistry, with each section focusing on specific applications of the materials studied. Journal of Materials Chemistry A emphasizes applications in energy and sustainability, including topics such as artificial photosynthesis, batteries, and fuel cells. Journal of Materials Chemistry B focuses on applications in biology and medicine, while Journal of Materials Chemistry C covers applications in optical, magnetic, and electronic devices. Example topic areas within the scope of Journal of Materials Chemistry A include catalysis, green/sustainable materials, sensors, and water treatment, among others.