基于工艺-组分协同优化的勃姆石涂覆锂电池隔膜性能OA

This study demonstrates a significant enhancement in the overall performance of polypropylene(PP)separators through the synergistic optimization of boehmite(γ-AlOOH)ceramic slurry formulation and coating process.An aqueous slurry was prepared via ball milling,with a systematic investigation conducted on the ball milling time,pH value,and binder content.The results indicated that ball milling for 60 minutes reduced the particle D50 to approximately 410 nm.When the slurry pH was maintained between 9.5 and 10.5,the centrifugal sedimentation rate was optimized to below 9%.Coupled with the incorporation of 8%polyacrylate binder,the coating peel strength was increased to approximately 1.8 N/13 mm.The separator coated with a 30%boehmite loading exhibited superior overall performance:puncture strength was enhanced to 715 g,electrolyte uptake reached 114%,and the thermal shrinkage rates at 130℃were approximately 2.40%and 0.87%in the transverse(TD)and machine(MD)directions,respectively.Furthermore,FTIR(characteristic Al—O peak at 748 cm-1),EDS(characteristic Al element signal),and SEM analyses confirmed the uniform distribution and successful loading of the particles(30%boehmite sample).This research provides crucial insights into the synergistic optimization of process parameters and component formulation for the development of high-safety lithium-ion battery separators.