The invention belongs to the technical field of
lithium ion batteries and particularly relates to a membrane for a
lithium ion battery, which is good in safety performance and mechanical performance. The membrane for the
lithium ion battery comprises a
porous membrane substrate, a
ceramic material layer coated on the surface of the
porous membrane substrate, and a
polymer sticking layer which is coated on the
ceramic material layer and is located on the
surface layer. Compared with the prior art, the
ceramic material layer can form a microcosmic
physical separation on the surface of the membrane so as to reduce the piercing effect of a lithium pine-tree
crystal on the membrane; the ceramic material layer coated on the
porous membrane substrate can improve the
heat resistance of the membrane; the
polymer sticking layer which is coated on the ceramic material layer and has a sticking effect can be used for preventing an inner
short circuit caused by staggering of the membrane and an
electrode, so that the safety performance of the battery is enhanced. In addition, the membrane, an
anode sheet and a
cathode sheet are joined together through the effect of the
polymer sticking layer, so that the mechanical performance of the battery can be enhanced. Furthermore, the invention further discloses the
lithium ion battery containing the membrane.