Samsung Sdi Co., Inc.

Jeong-Ki Ha

Yong-Beom Lee

Duck-Chul Hwang

Keun-Won Song

Disclosed is a lithium secondary battery that includes a separator including a coating layer including an inorganic compound, a polymer and an organic/inorganic bonding silane compound formed from an organic/inorganic bonding silane compound having a first reactive functional group; and an electrode contacting the coating layer, and including an active material and a binder formed from a binder having a second reactive functional group, wherein the first reactive functional group is reactive with the second reactive functional group, and the lithium secondary battery includes a chemical bond generated by reacting the first reactive functional group with the second reactive functional group.

Lithium secondary battery

A method of preparing a lithium secondary battery is disclosed, the method including coating a coating layer-forming composition including an inorganic compound and an organic/inorganic bindable silane compound having a first reactive functional group on a substrate to form a separator including a coating layer; preparing an electrode including an active material and a binder having a second reactive functional group; stacking the electrode to contact the coating layer of the separator, and adding an electrolyte to the electrode and separator to prepare a lithium secondary battery; and heat-treating the lithium secondary battery to react the first reactive functional group with the second reactive functional group and form a chemical bond.

Method of preparing lithium secondary battery

A separator for a battery having a porous base material layer and a polymer coating layer formed on at least a surface of the base material layer. The polymer coating layer includes a first fluorinated copolymer and a non-fluorinated polymer. A weight ratio of the first fluorinated copolymer to the non-fluorinated polymer is in a range of 3:1 to 1:3.

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Yongin-si, South Korea

Jeong-Ki Ha