Patent watch: ELECTROCHEMICAL DEVICE WITH ALTERNATIVE SEPARATOR SYSTEM

New patent application from LG Chem: Provided is an electrochemical device comprising multi-stacked unit cells of full cells or bicells and a separation film disposed therebetween, whereby the separation film and separators are alternately stacked between electrode layers with an opposite polarity. Herein, as the separation film is formed of a material having a higher thermal shrinkage rate than that of the separator, the thermal stability of the device can be secured by stable induction of shutdown via thermal behavior of the separation film, without causing short-circuiting due to thermal shrinkage of the separator even when a temperature of a battery suddenly rises by internal or external factors.

Application number: 13/107,122 
Publication number: US 2011/0217586 A1 Filing date: May 13, 2011 
Inventors: Je Young KIM, Pil Kyu PARK, Soonho AHN Original Assignee: LG CHEM, LTD.

  original separator placementOriginal separator placement New sep placement New separator placement

Also some Claims suggested that the separator is formed of a ceramic material or an engineering plastic having a melting point of more than 200° C. wherein the ceramic material is selected from the group consisting of Pb(Zr,Ti)O3, Pb1−xLaxZr1−yTiyO3 wherein x and y are independently in the range of 0 to 1, PB(Mg3Nb2/3)O3-PbTiO3, BaTiO3, HfO2, SrTiO3, TiO2, SiO2, Al2O3, ZrO2, SnO2, CeO2, MgO, CaO, Y2O3 and any combination thereof and the engineering plastic is selected from the group consisting of polyester, polysulfone, polyimide, polyamide, polyacetal and any combination thereof.
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