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Separator is an essential component of lithium-ion battery, affecting the electrochemical performance and safety of battery. The material-structure-tensile property relationship is significant, herein, a multi-scale modeling method is proposed to explore cellulose separator. Theoretical calculation is utilized to study the composite material in material scale. A multi-layered model is established to survey single fiber in micro scale. Random fibrous networks are applied as representative volumetric element (RVE) models to investigate the fibrous network in meso scale. The multi-scale modeling method manages to conduct reliable simulation on tensile property of cellulose separator, and provide behavior predicting function on further study. A multi-scale modelling method is proposed for cellulose separator Scales including composite materials, single fiber, and fibrous network are studied One-step method is realized combining modelling and simulation of RVE models Relationship between structural parameters. A multi-scale modelling method is proposed for cellulose separator Scales including composite materials, single fiber, and fibrous network are studied One-step method is realized combining modelling and simulation of RVE models Relationship between structural parameters and tensile properties are predicted and tensile properties are predicted.

Multi-scale modeling study on fibrous network of cellulose separator for lithium-ion battery