A lithium (Li) ion battery comprising a first electrode, a second electrode, and a shutdown polymer additive being provided on an outer surface of the first electrode, the shutdown polymer additive comprising a plurality of PE microspheres, the shutdown polymer additive providing an operating mode, wherein - a temperature of the battery is below a melting temperature of the PE, and - the conductive network allows lithium ions to pass through the network for moving between the first electrode and the second electrode, and the shutdown polymer additive providing a shutdown mode, wherein - the temperature of the battery is at the melting temperature of the PE, and - the PE layers melt to form essentially one insulating film, wherein the insulating film prevents the Li ions from moving between the first electrode and the second electrode, characterized in that the shutdown polymer additive comprises: - at least two polyethylene (PE) layers, each PE layer comprising a plurality of PE microspheres, wherein the PE microsphere is wrapped with carbon nanotubes (CNT), wherein the PE microspheres interconnect with each other such that the carbon nanotubes form a conductive network, wherein the PE layers are provided at predetermined areas of the outer surface of the first electrode, and wherein the PE layers are separated from each other by a predetermined distance. a first electrode, a second electrode, and a shutdown polymer additive being provided on an outer surface of the first electrode, the shutdown polymer additive comprising a plurality of PE microspheres, the shutdown polymer additive providing an operating mode, wherein - a temperature of the battery is below a melting temperature of the PE, and - the conductive network allows lithium ions to pass through the network for moving between the first electrode and the second electrode, and the shutdown polymer additive providing a shutdown mode, wherein - the temperature of the battery is at the melting temperature of the PE, and - the PE layers melt to form essentially one insulating film, wherein the insulating film prevents the Li ions from moving between the first electrode and the second electrode, characterized in that the shutdown polymer additive comprises: - at least two polyethylene (PE) layers, each PE layer comprising a plurality of PE microspheres, - a temperature of the battery is below a melting temperature of the PE, and - the conductive network allows lithium ions to pass through the network for moving between the first electrode and the second electrode, - the temperature of the battery is at the melting temperature of the PE, and - the PE layers melt to form essentially one insulating film, wherein the insulating film prevents the Li ions from moving between the first electrode and the second electrode, - at least two polyethylene (PE) layers, each PE layer comprising a plurality of PE microspheres, wherein the PE microsphere is wrapped with carbon nanotubes (CNT), wherein the PE microspheres interconnect with each other such that the carbon nanotubes form a conductive network, wherein the PE layers are provided at predetermined areas of the outer surface of the first electrode, and wherein the PE layers are separated from each other by a predetermined distance. <EOS>