Patent ID: 9225036
Filing Date: 2015-12-29
Classification: H01M,Y02E,Y02T

Abstract:
1. An electrochemical device comprising a cathode, an anode, a separator and an electrolyte, wherein the electrochemical device includes an additive introduced into at least one selected from a group consisting of the cathode, the anode, the separator, the electrolyte, a housing device and an empty space inside the electrochemical device for improvement in safety of the electrochemical device, wherein the additive comprises a particle having a spherical shape, said particle comprising an inner core and an outer coating layer present on a surface of the inner core, wherein the inner core is formed using a volume-expandable material fused at a temperature of more than 100° C. while the outer coating layer is formed using a conductive material with higher conductivity than that of the inner core and covers an outer face of the inner core, wherein the outer coating layer comprises at least one or more selected from a group consisting of carbon materials, electron-conductive inorganic materials and electron-conductive polymer, wherein a thickness of the outer coating layer ranges from 0.5 to 50% of the size of the inner core and the thickness of the outer coating layer ranges from 50 to 150 nm, wherein the carbon materials are selected from the group consisting of carbon black, acetylene black and super-P, wherein the electron-conductive inorganic materials are selected from the group consisting of indium-tin oxide (In wherein the electron-conductive polymer is selected from the group consisting of polypyrrole, polyaniline, polythiophene and polyacetylene.