TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The polymerizable compounds further include a third polymerizable compound having a highly polar functional group and polymerizable functional group, where the polymer further has the highly polar functional group. The aromatic functional group has the halogen containing functional group, where the halogen is bromine or chlorine. The polymerizable compounds include the first polymerizable compound of formula (Z1-X-A) (I) or Z1-A (II) and the second and third polymerizable compounds (Z2-Y1) (III) or Z3-W1 (IV). The overcharge inhibitor includes a polymer obtained from the polymerizable compounds through polymerization. The polymer includes a polymer of formula (-(Zp1-X-A)a-(Zp2-Y1)b-(Zp3-W1)c-) (V), (-(Zp1-A)a-(Zp2-Y1)b-(Zp3-W1)c-) (VI) or poly vinyl benzene (VII). The mixture further includes the third polymerizable compound having the highly polar functional group and the polymerizable functional group. Preferred Method: The method further comprises a step of adding a polymerization initiator to the mixture to perform a reaction.Z1-Z3 = polymerizable functional groups;X = hydrocarbon or 1-20C oxyalkylene;A = aromatic functional group;Y1 = halogen-containing functional group;W1 = highly polar functional group;Zp1-Zp3 = residues of polymerizable functional groups;a-c = ratios on molar basis;R1 = H, aliphatic hydrocarbon, alicyclic hydrocarbon or aromatic;R2 = halo-containing functional group;R3 = functional group having at least one oxyalkylene, CN, NH2 or OH; andR4-R6 = H or hydrocarbon. EXAMPLE - Acrylic acid 4-cyclohexyl-phenyl ester (monomer-1) (46 g), 2-(2-(2-methoxy-ethoxy)-ethoxy)-3-methyl-buta-1,3-diene (monomer-2) (113 g) and 1-bromo-2-vinyl-benzene (monomer-3) (36.4 g) was mixed to obtain a mixture. The mixture was combined with azobisisobutyronitrile serving as a polymerization initiator (1 part by weight), followed by stirring until azobisisobutyronitrile was dissolved. The reaction solution was sealed and reacted on an oil bath at 60 degrees C for 3 hours. After the completion of reaction, the reaction solution was added to methanol (200 ml) to give white precipitates. The precipitates were collected from the mixture by filtration, dried at 60 degrees C under a reduced pressure to yield polymer A. Polymer A (3 wt.%) was added to an electrolytic solution (comprising electrolytic salt: lithium hexafluorophosphate, solvent: ethylene carbonate/dimethyl carbonate/ethyl methyl carbonate is 1:1:1 (by volume)) to form a battery.