NOVELTY - The battery (10) has a porous polymer separator membrane with sides consisting of surface areas and open pores interconnecting sides of the membrane. The open pores comprise surface areas. Surface areas of a separator exhibit co-extensive coating of separately and sequentially applied molecules layers of electrically resistive ceramic material, where the coating adapts to the surface areas of the separator without closing the open pores. The porous polymer separator membrane is formed of polyolefin.    USE - Lithium ion battery for use in a portable consumer electronics apparatus e.g. laptop computer, mobile phone and wireless tool, and for use in a vehicle e.g. hybrid vehicle and electric vehicle for providing energy to an electric motor for propulsion of wheels.    ADVANTAGE - The surface areas of the separator exhibit the co-extensive coating of the separately and sequentially applied molecules layers of the electrically resistive ceramic material, where the coating adapts to the surface areas of the separator without closing the open pores, thus ensuring reduced environmental impacts without involvement of chlorinated solvents and uniformity of the coating at the separator.    DETAILED DESCRIPTION - The coating of the surface areas of the separator comprises molecules including atoms of metal element selected from aluminum, calcium, magnesium, silicon, titanium and zirconium or aluminum oxide and atoms of non-metal element selected from carbon, nitrogen and oxygen. Trimethylaluminum is used as a source for aluminum atoms. An INDEPENDENT CLAIM is also included for a method for forming a conformal, electrical resistive ceramic coating on a porous polyolefin polymer membrane separator for a lithium ion battery.    DESCRIPTION OF DRAWING(S) - The drawing shows an enlarged schematic perspective view of a single cell of a lithium ion battery in a discharge mode.    Lithium ion battery (10)    Negative electrode (12)    Negative electrode current collector (12a)    Positive electrode (14)    Microporous polymer separator (16)