Performance and application of special polypropylene T 98 series products for lithium ion battery separator
In order to meet the domestic market de-mand for special materials for lithium ion battery separator,special polypropylene(PP)T 98 series products for lithium ion battery separator was pro-duced by using Spheripol double ring tube process by Dushanzi Petrochemical Company of PetroChina.The basic properties,mechanical properties,ther-mal properties,relative molecular weight and its distribution of T 98 G/T 98 F/T 98 D/T 98 CD and the properties of diaphragm products were analyzed.The results showed that compared with typical im-ported benchmark samples,the oxidation induced time of T 98 series products(about 38 min)was longer,the number average molecular weight(about 12.0×104)was larger,and the relative molecular weight distribution(about 3.1)was narrower.T 98 F/T 98 G was suitable for dry biaxial drawing process and T 98 D/T 98 CD was suitable for dry uniaxial drawing process.Compared with imported sample products,the range between the breathable layers of the lithium ion battery separator products produced by T 98 D/T 98 CD decreased by 8.8%and 19.8%respectively,and the longitudinal tensile strength increased by 11.6%and 25.4%respectively.The separator pore size concentration was good,the dis-tribution was uniform,and no obvious double peaks.
polypropylenelithium ion battery separatormelt flow rateoxidation induced timetensile strength
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