Asymmetrical separator

An asymmetric separator comprising:

• a base having two sides, wherein each side independently contacts an electrode of a battery, wherein the base comprises a nonwoven, wherein the base is coated on one of the two sides with a first material mixture and is coated on another of the two sides with a second material mixture,
• wherein the two coated sides have a different material consistency and the first material mixture and the second material mixture at least partially penetrate into the nonwoven,
• wherein the first material mixture comprises Al2O3 particles configured to set a porosity of the side coated with the first material mixture,
• wherein the second material mixture comprises polyvinylidene fluoride particles having a mean particle size in a range from 0.2 μm to 10 μm and binder particles,
• wherein the polyvinylidene fluoride particles are configured to set a porosity of the side coated with the second material mixture,
• wherein at least a portion of the polyvinylidene fluoride particles is disposed on an outer surface of the side coated with the second material mixture so as to enable direct contact with the electrode in contact with the side coated with the second material mixture,
• wherein the polyvinylidene fluoride particles are bound to the nonwoven using the binder particles,
• wherein the nonwoven has a melting point higher than 140° C., and
• wherein the separator has a maximum shrinkage of 5% at a temperature of 150° C.