Polymer electrolyte with effective leakage resistance and lithium battery using the same

A method of preparing a polymer electrolyte comprising a polymerized product of a polymer electrolyte forming composition comprising

• polyester (meth)acrylate having a polyester polyol moiety having three or more hydroxide (—OH) groups, at least one hydroxide group being substituted by a (meth)acrylic ester group and at least one hydroxide group being substituted by a radical non-reactive group, or its polymer;
• at least one selected from polyalkylene glycol di(meth)acrylates represented by Formula 1 and polyalkylene glycol (meth)acrylates represented by Formula 2;
• and
• an electrolytic solution having a lithium salt and an organic solvent:
• 6
• wherein R1, R2, R3 and R4 are independently H or CH3, and n and m are independently an integer from 1 to 100,000,
• the method comprising:
• obtaining a polymer electrolyte forming composition by mixing polyester (meth)acrylate having a polyester polyol moiety having three or more hydroxide (—OH) groups, at least one hydroxde group being substituted by (meth)acrylic ester group and at least one hydroxide group being substituted by radical non-reactive group, or its polymer, at least one selected from polyalkylene glycol di(meth)acrylates represented by Formula 1 and polyalkylene glycol (meth)acrylates represented by Formula 2, and an electrolytic solution having a lithium salt and an organic solvent:
• 7
• wherein R1, R2, R3 and R4 are independently H or CH3, and n and m are independently an integer from 1 to 100,000;
• and
• casting the polymer electrolyte forming composition and polymerizing by heat or light.

A lithium battery comprising:

• a cathode;
• an anode;
• and
• a polymer electrolyte comprising a polymerized product of a polymer electrolyte forming composition comprising
• polyester (meth)acrylate having a polyester polyol moiety having three or more hydroxide (—OH) groups, at least one hydroxide group being substituted by a (meth)acrylic ester group and at least one hydroxide group being substituted by a radical non-reactive group, or its polymer;
• at least one selected from polyalkylene glycol di(meth)acrylates represented by Formula 1 and polyalkylene glycol (meth)acrylates represented by Formula 2;
• and
• an electrolytic solution having a lithium salt and an organic solvent:
• 8
• wherein R1, R2, R3 and R4 are independently H or CH3, and n and m are independently an integer from 1 to 100,000. comprising an insulating resin between the cathode and the anode.

A method of preparing a lithium battery comprising:

• obtaining a polymer electrolyte forming composition by mixing polyester (meth)acrylate having a polyester polyol moiety having three or more hydroxide (—OH) groups, at least one hydroxide group being substituted by a (meth)acrylic ester group and at least one hydroxide group being substituted by a radical non-reactive group, or its polymer, at least one selected from polyalkylene glycol di(meth)acrylate represented by Formula 1 and polyalkylene glycol (meth)acrylates) represented by Formula 2, and an electrolytic solution having a lithium salt and an organic solvent;
• inserting a separator made of an insulating resin having a network structure between a cathode and an anode to form an electrode assembly and accommodating the electrode assembly into a battery case;
• and
• forming the polymer electrolyte by injecting the polymer electrolyte forming composition into a resulting product and polymerizing by heat or light:
• 9
• wherein R1, R2, R3 and R4 are independently H or CH3, and n and m are independently an integer from 1 to 100,000.