Separator for lithium ion secondary battery, method for manufacture thereof, and lithium ion secondary battery

  • US 8,741,489 B2
  • Filed: 09/11/2009
  • Issued: 06/03/2014
  • Est. Priority Date: 09/12/2008
  • Status: Active Grant
First Claim
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1. A separator for lithium ion secondary batteries, comprising an inorganic layer formed from inorganic particles, and a porous base material consisting essentially of an organic resin and selected from a woven fabric, a knitted fabric, and a non-woven fabric, wherein the inorganic particles have a particle diameter distribution in which the 50% cumulative particle diameter D50 is in the range of 100 nm to 500 nm, the 10% cumulative particle diameter D10 is 0.5D50 or more, and the 90% cumulative particle diameter D90 is 2D50 or less, and wherein the inorganic layer is formed on the porous base material.

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