Welcome to Boliven.com, the leading portal for R&D, business development and IP professionals

Free & easy searching » Analyze & Download search results » Work collaboratively with colleagues » We keep you updated »

Click here to Sign Up. It's Free To Join.

Filing Information

Inventor(s)	Sankar Dasgupta · Rakesh Bhola · James K. Jacobs ·
Assignee(s)	None listed in document.  View assignee updates
Attorney/Agent(s)	H. Samuel Frost · Bereskin & Parr LLP ·
Primary Examiner	Patrick Ryan ·
Assistant Examiner	Monique Wills ·
Application Number	US10799759
Filing date	03/15/2004
Issue date	09/15/2009
Prior Publication Data	US20040175626 - 09/09/2004
Predicted expiration date	12/05/2020
Patent term adjustment	894
U.S. Classifications	429/309  ·
International Classifications	H01M1040 ·
Related U.S. Application Data	This application claims the benefit of U.S. Provisional Application No. 60/082,341, filed Apr. 20, 1998, and is a Continuation-in-Part Application of Complete application Ser. No. 09/104,277, filed on Jun. 25, 1998 and a Continued Prosecution Application filed Jun. 12, 2001.

Patent Family

Abstract

The composite electrolyte for use in a thin plate rechargeable lithium battery comprises a porous or micro-porous inert, multi-layered polymer separator laminate which carries an adherent second polymer coating containing a dissociable lithium compound, and the multi-layered separator having adherent solid second polymer layer, is impregnated with an organic liquid containing another lithium salt. The porous or micro-porous separator laminate is made of multiple polymer layers, at least one of the member layers having melting temperature at least 20-C below the melting temperature of the other polymer member layers. The composite porous electrolyte is inserted between the electrodes of a rechargeable lithium battery. In another embodiment the porous polymer separator sheet has an adherent, dissociable lithium compound containing, solid second polymer layer on each of its major faces.

Independent Claims | See all claims (13)

1. 1. A composite electrolyte for a rechargeable lithium battery comprising: an inert, first, porous, laminate layer of a first polymer, having a first multiplicity of pores including walls, and two major faces, and having an adherent, solid, second layer of a second polymer deposited on at least one of said major faces, said adherent, solid, second polymer layer containing a first lithium compound having dissociable lithium ions, wherein said adherent, solid, second polymer layer partially fills one portion of said first multiplicity of pores of said inert, first, porous laminate layer, thereby providing a composite, porous, polymer structure of at least two polymer layers, having a second portion of said first multiplicity of pores unfilled, and wherein said unfilled second portion of said pores of said composite, porous, polymer structure is impregnated with an organic liquid containing a second lithium compound having dissociable lithium ions, and wherein said inert, first, porous laminate layer is comprised of a second multiplicity of porous sub-layers, and at least two of said second multiplicity of porous sub-layers have different melting temperatures.