Abstract: The present disclosure provides a separator and a lithium-ion secondary battery. The separator comprises: a microporous membrane having micropores; and a coating provided on a surface of the microporous membrane. The coating comprises polymer particles and binder particles. The polymer particle is a hollow shell structure which comprises a shell and a cavity positioned in the shell, an outer surface of the shell is distributed with nanopores which are communicated with the cavity, a particle diameter of the polymer particle is larger than a pore size of the micropore of the microporous membrane; a particle diameter of the binder particle is larger than the pore size of the micropore of the microporous membrane. The lithium-ion secondary battery comprises: a positive electrode plate; a negative electrode plate; the aforementioned separator interposed between the positive electrode plate and the negative electrode plate; and an electrolyte.

Abstract: The present disclosure relates to a separator of a lithium-ion battery and a preparation method thereof, the separator comprises a substrate membrane and a coating provided on a surface of the substrate membrane, the coating comprises ceramic particles, an adhesive and a solid polymer wax which has a melting point of 85˜120° C., a molecular weight of 1,000˜25,000 and a particle size of 0.5˜10 ?m. When the lithium-ion battery is heated due to overcharge and the like to make the interior temperature reach the melting point of the solid polymer wax, the solid polymer wax can be melt and enter among the ceramic particles and into the micropores of the substrate membrane by capillarity so as to function as electrical disconnection, which can effectively cut off the channel of the lithium ions and stop the overcharge, and ensure the safety performance of the lithium-ion battery under the situation of overcharge.

Abstract: The present disclosure provides a separator and a lithium-ion secondary battery. The separator comprises: a microporous membrane having micropores; and a coating provided on a surface of the microporous membrane. The coating comprises polymer particles and binder particles. The polymer particle is a hollow shell structure which comprises a shell and a cavity positioned in the shell, an outer surface of the shell is distributed with nanopores which are communicated with the cavity, a particle diameter of the polymer particle is larger than a pore size of the micropore of the microporous membrane; a particle diameter of the binder particle is larger than the pore size of the micropore of the microporous membrane. The lithium-ion secondary battery comprises: a positive electrode plate; a negative electrode plate; the aforementioned separator interposed between the positive electrode plate and the negative electrode plate; and an electrolyte.

Abstract: The present disclosure relates to a separator of a lithium-ion battery and a preparation method thereof, the separator comprises a substrate membrane and a coating provided on a surface of the substrate membrane, the coating comprises ceramic particles, an adhesive and a solid polymer wax which has a melting point of 85˜120° C., a molecular weight of 1,000˜25,000 and a particle size of 0.5˜10 ?m. When the lithium-ion battery is heated due to overcharge and the like to make the interior temperature reach the melting point of the solid polymer wax, the solid polymer wax can be melt and enter among the ceramic particles and into the micropores of the substrate membrane by capillarity so as to function as electrical disconnection, which can effectively cut off the channel of the lithium ions and stop the overcharge, and ensure the safety performance of the lithium-ion battery under the situation of overcharge.