Lg Electronics Inc.

Misun Lee

Eunseck Kang

Koun Park

Kyungho Jung

Juchul Lee

Dongwook Lee

Hongcheol Lee

Eunja Lim

The present disclosure is applicable to the technical field related to a secondary battery, and relates to, for example, a separator structure for the secondary battery, a method for preparing the same, and the secondary battery using the same. A separator structure disposed inside a secondary battery includes a porous support body including a first face and a second face, and a cellulose nano fiber subjected to an ionic surface treatment located on at least one of the first face and the second face of the support body.

Separator structure for secondary battery, method for making the separator, and the secondary battery using the same

A method according to the present disclosure may includes preparing a urea solution by dissolving urea in distilled water, adding phosphoric acid to the urea solution, adding pulp to the solution in which urea and phosphoric acid are dissolved, heating the solution such that the urea and the phosphoric acid each react with the pulp and preparing nanocellulose by washing the pulp which is completely reacted, and then grinding the pulp, in which a weight of the phosphoric acid is 10 to 50% based on a weight of the pulp.

Method for preparing nanocellulose

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Seoul, South Korea

Misun Lee