Degradation kinetics of ultra-high molecular-weight polyethylene for wet-process separator of lithium-ion battery
The paper reported an investigation on the degradation kinetics of ultra-high molecular-weight polyethylene(PE-UHMW)used for wet-process separator of lithium-ion battery under different conditions such as temperature,synthetic oil concentration,and shear force.A degradation rate curve was fitted to obtain a kinetic model suitable for the degrada-tion behavior of PE-UHMW.The degradation kinetics of PE-UHMW at various temperatures and white oil concentra-tions was consistent with the first-order kinetic model;however,its degradation kinetics under a shear stress conformed to the second-order kinetic model.The degradation rate of PE-UHMW increased with an increase in the temperature and shear force;however,its degradation rate was reduced by the addition of white oil.
lithium battery wet-process separatorultra-high molecular weight polyethylenedegradation kinetics model
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