Polylactam coated separator membranes for lithium ion secondary batteries and related coating formulations

A polylactam ceramic coated microporous battery separator membrane for a secondary lithium ion battery where the polylactam is defined by the chemical structure:

• where R1, R2, R3, and R4 can be an alkyl or aromatic substituents and R5 can be an alkyl, aromatic, or fused ring and;
• where the preferred polylactam can be a homopolymer or a copolymer where co-polymeric ‘X’ group can be a derived from vinyl, alkyl vinyl, substituted alkyl vinyl, vinyl alcohol, vinyl acetate, acrylic acid, alkyl acrylate, acrylonitrile, maleic anhydride, maleic imide, styrene, polyvinylpyrrolidone (PVP),
• polyvinylvalerolactam, polyvinylcaprolactam (PVCap), polyamide, or polyimide and;
• where ‘m’ can have values between 1 and 10, and preferably is between a value of 2 and 4.

A polylactam coated battery separator membrane for a secondary lithium ion battery where the polylactam is defined by the chemical structure:

• where R1, R2, R3, and R4 can be an alkyl or aromatic substituents and R5 can be an alkyl, aromatic, or fused ring and;
• where the preferred polylactam can be a homopolymer or a copolymer where co-polymeric ‘X’ group can be a derived from vinyl, alkyl vinyl, substituted alkyl vinyl, vinyl alcohol, vinyl acetate, acrylic acid, alkyl acrylate, acrylonitrile, maleic anhydride, maleic imide, styrene, polyvinylpyrrolidone (PVP),
• polyvinylvalerolactam, polyvinylcaprolactam (PVCap), polyamide, or polyimide and;
• where ‘m’ can have values between 1 and 10, and preferably is between a value of 2 and 4.

A ceramic coated microporous battery separator membrane where the ceramic coating includes ceramic particules and a polylactam defined by the chemical structure:

• where R1, R2, R3, and R4 are selected from the group consisting of alkyl and aromatic substituents and R5 is selected from the group consisting of alkyl, aromatic, and fused ring substituents and;
• where R1, R2, R3, and R4 are selected from the group consisting of alkyl and aromatic substituents and R5 is selected from the group consisting of alkyl, aromatic, and fused ring substituents and;
• where the polylactam is a homopolymer or a copolymer, where co-polymeric ‘X’ group is derived from vinyl, alkyl vinyl, substituted alkyl vinyl, vinyl alcohol, vinyl acetate, acrylic acid, alkyl acrylate, acrylonitrile, maleic anhydride, maleic imide, styrene, polyvinylpyrrolidone (PVP), polyvinylvalerolactam, polyvinylcaprolactam (PVCap), polyamide, or polyimide;
• where ‘m’ has a value between 1 and 10.