SURFACE-COATED CATHODE ACTIVE MATERIAL, METHOD FOR PREPARING SAME, AND LITHIUM SECONDARY BATTERY INCLUDING SAME

Title:

SURFACE-COATED CATHODE ACTIVE MATERIAL, METHOD FOR PREPARING SAME, AND LITHIUM SECONDARY BATTERY INCLUDING SAME

Document Type and Number:

WIPO Patent Application WO/2015/115815

Kind Code:

A1

Abstract:

The present invention provides a surface-coated cathode active material and a method for preparing the same, the surface-coated cathode active material comprising: a cathode active material; and a nanofilm coated on a surface of the cathode active material, wherein the nanofilm includes polyimide (PI) and a fibrous carbon material. According to one embodiment of the present invention, when a surface of a cathode active material is coated with a nanofilm including polyimide and a fibrous carbon material, a direct contact with an electrolyte of the cathode active material is prevented so as to suppress a side reaction between the cathode active material and the electrolyte, such that the life of a secondary battery is capable of being remarkably improved. Particularly, it is possible to improve life and conductivity under high-temperature and high-voltage conditions.

Inventors:

JANG WOOK (KR)
LEE SANG YOUNG (KR)
CHO SEUNG BEOM (KR)
PARK JANG HOON (KR)
KIM JU MYUNG (KR)

Application Number:

PCT/KR2015/000936

Publication Date:

August 06, 2015

Filing Date:

January 28, 2015

Export Citation:

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Assignee:

LG CHEMICAL LTD (KR)
UNIST ACADEMY IND RES CORP (KR)

International Classes:

H01M4/62; H01M4/13; H01M4/505; H01M4/525; H01M10/052

Foreign References:

KR20100081947A	2010-07-15
KR20130139711A	2013-12-23
KR20110126418A	2011-11-23
KR20080071387A	2008-08-04

Other References:

PARK, JANG-HOON ET AL.: "Polyimide gel polymer electrolyte-nanoencapsulated LiCo02 cathode materials for high-voltage Li-ion batteries", ELECTROCHEMISTRY COMMUNICATIONS, vol. 12, no. 8, 2 June 2010 (2010-06-02), pages 1099 - 1102, XP027137114

Attorney, Agent or Firm:

BAE, KIM & LEE IP GROUP (KR)
특허법인 태평양 (KR)

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