Article Synopsis
- Polyethylene terephthalate (PET) tape is commonly used in lithium-ion battery production to keep electrode stacks secure, but its chemical stability can lead to issues like unwanted self-discharge.
- In experiments, it was discovered that PET can break down into dimethyl terephthalate in the presence of common electrolyte solvents, worsening battery performance.
- Researchers found that using chemically stable alternatives like polypropylene and polyimide tape can significantly reduce self-discharge in lithium-ion cells.
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Article Abstract
Polyethylene terephthalate (PET) tape is widely used by well-known lithium-ion battery manufacturers to prevent electrode stacks from unwinding during assembly. PET tape is selected since it has suitable mechanical and electrical properties, but its chemical stability has been largely overlooked. In the absence of effective electrolyte additives, PET can depolymerize into its monomer dimethyl terephthalate, which is an unwanted redox shuttle that induces substantial self-discharge in a lithium-ion cell. This study presents a chemical screening experiment to probe the PET decomposition mechanism involving in situ generated methanol and lithium methoxide from dimethyl carbonate, one of the most common electrolyte solvents in lithium-ion cells. By screening other polymers, it is found that polypropylene and polyimide (Kapton) are stable in the electrolyte. Finally, it is demonstrated that reversible self-discharge of LiFePO-graphite cells can be virtually eliminated by replacing PET jellyroll tape with chemically stable polypropylene tape.
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