Material Drying
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PVDF Lithium Battery Binder Slurry Processing Problems
Problem Phenomenon
【Problem phenomenon】PVDF cathode binder slurry gels and viscosity drifts, and coating areal density is uneven
Cause Analysis
PVDF dissolution in NMP is sensitive to moisture, and trace water causes slurry gelation; insufficient dissolution temperature and stirring cause incomplete swelling and unstable viscosity; slurry processing directly affects electrode quality
Solution
Strictly control moisture in raw materials and NMP, and dehumidify the workshop; dissolve according to solid content and temperature procedures and verify the viscosity window; use the slurry within a time limit to prevent post-gelation; After adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Lithium battery slurry gelation is mostly due to moisture; dehumidification plus procedural dissolution is the foundation; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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