Loading patent…
AssigneeSK ie technology Co., Ltd.
InventorIn Hwa JUNG
Estimating the term…
Provided are a polyolefin-based microporous membrane and methods for manufacturing the same, a separator comprising the polyolefin-based microporous membrane, and a secondary battery comprising the separator. The polyolefin-based microporous membrane or the separator comprising the same comprises a polyolefin, and has a gas permeability of about 2.5×10−5 Darcy or more, a shrinkage rate in the transverse direction (TD) at 120° C. of about 10% or less, and a BDV index of about 15 or more as represented by the following Equation 1: BDV index = ( ( P 2 + M 4 ) D × d × ε ) × 1 0 0 [ Equation 1 ] wherein the variables are defined as follows: P: puncture strength (N/μm) of the polyolefin-based microporous membrane; M: viscosity average molecular weight (×105 g/mol) of polyolefin; D: gas permeability (×10−5 Darcy) of the polyolefin-based microporous membrane; d: average pore size (nm) of the polyolefin-based microporous membrane; and ε: porosity of the polyolefin-based microporous membrane.)
A polyolefin-based microporous membrane comprising a polyolefin-based resin, wherein the polyolefin-based microporous membrane has a gas permeability of about 2.5×10−5 Darcy or more, a shrinkage rate in the transverse direction (TD) at 120° C. of about 10% or less, and a BDV index of about 15 or more as represented by the following Equation 1:
A method for manufacturing a polyolefin-based microporous membrane, the method comprising:
A separator comprising a polyolefin-based microporous membrane, wherein the polyolefin-based microporous membrane includes a polyolefin, and has a gas permeability of about 2.5×10−5 Darcy or more, a shrinkage rate in the transverse direction (TD) at 120° C. of about 10% or less, and a BDV index of about 15 or more as represented by the following Equation 1:
Dependencies are inferred from the claim text.