3-Methyl-2-oxazolidinone (JEFFSOL® MEOX) as a Substitute Solvent for NMP in Battery Manufacturing

IF 3.1 4区 工程技术 Q2 ELECTROCHEMISTRY Journal of The Electrochemical Society Pub Date : 2024-09-17 DOI:10.1149/1945-7111/ad77b1
Jean E. Marshall, Victoria White, Ke Zhang, Philip Bellchambers, Jerzy Gazda, Mark Copley, Louis F. J. Piper and Matthew J. Capener
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Abstract

This work presents 3-Methyl-2-oxazolidinone (JEFFSOL® MEOX) as a substitute solvent for N-methyl-2-pyrrolidone (NMP) in the manufacture of Li-ion batteries. NMP is a good solvent for polyvinylidene difluoride (PVDF, a common binder material), and also has a high boiling point (202 °C), allowing for gradual drying of electrode slurries to form homogeneous coatings. However, NMP has a reprotoxic effect and its use is attracting increasing legislative pressure; it would be advantageous to the battery-making industry to find a more benign alternative. Of the few other solvents that will readily dissolve PVDF, examples such as dimethylformamide are also significantly toxic, so further investigation is necessary to find a credible alternative solvent system. We show that JEFFSOL® MEOX (boiling point 225 °C) is capable of dissolving PVDF at accessible temperatures (40 °C–50 °C), and that at a similar ratio of active material:binder:solvent, both JEFFSOL® MEOX and NMP produce electrode slurries with a viscosity of 5–6 Pa.s at 25 °C and at a shear rate of 10 s−1. Cells formed using JEFFSOL® MEOX-made and NMP-made cathode coatings showed comparable electrochemical performance.
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电池生产中 3-甲基-2-噁唑烷酮(JEFFSOL® MEOX)作为 NMP 的替代溶剂
本研究提出了 3-甲基-2-噁唑烷酮(JEFFSOL® MEOX)作为 N-甲基-2-吡咯烷酮(NMP)的替代溶剂,用于制造锂离子电池。NMP 是聚偏二氟乙烯(PVDF,一种常见的粘合剂材料)的良好溶剂,而且沸点高(202 °C),可使电极浆料逐渐干燥,形成均匀的涂层。然而,NMP 具有再毒性,其使用正面临越来越大的立法压力;如果能找到一种更无害的替代品,将对电池制造行业大有裨益。在其他少数几种可轻易溶解 PVDF 的溶剂中,二甲基甲酰胺等也有剧毒,因此有必要进行进一步调查,以找到可靠的替代溶剂系统。我们的研究表明,JEFFSOL® MEOX(沸点 225 °C)能够在可接受的温度(40 °C-50 °C)下溶解 PVDF,而且在活性材料:粘合剂:溶剂的比例相似的情况下,JEFFSOL® MEOX 和 NMP 在 25 °C、剪切速率为 10 s-1 的条件下产生的电极浆液粘度为 5-6 Pa.s。使用 JEFFSOL® MEOX 和 NMP 阴极涂层形成的电池具有相似的电化学性能。
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来源期刊
CiteScore
7.20
自引率
12.80%
发文量
1369
审稿时长
1.5 months
期刊介绍: The Journal of The Electrochemical Society (JES) is the leader in the field of solid-state and electrochemical science and technology. This peer-reviewed journal publishes an average of 450 pages of 70 articles each month. Articles are posted online, with a monthly paper edition following electronic publication. The ECS membership benefits package includes access to the electronic edition of this journal.
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