Solid Polyurethane Electrolyte

Title: POLYURETHANE BASED MEMBRANES AND/OR SEPARATORS FOR ELECTROCHEMICAL CELLS

 Number/Link: WO2013/062990

Applicant/Assignee: Lubrizol

Publication date: 2/05/2013

Gist”:  TPU prepared from a DEG-adipate polyester diol, HQEE and 4,4′-MDI can be used as Li ion-conducting electrolytes  in electrochemical cells.

Why it is interesting: Because of the rapidly increasing use of phones, tablets, electric cars etc. research into improved batteries is a very hot topic. Many modern batteries use Li+-conducting seperators or ‘membranes’ with specific conductivity, solvent swelling and heat-resistance properties.  According to this invention  improved separator membranes can be produced from (a surprisingly simple) thermoplastic polyurethane based on (preferably) 4,4′-MDI, hydroquinone bis (hydroxyethyl)ether as chain extender and a DEG-adipic polyester diol with a MW of 2000 to 3000.  Lithium conductivity can (optionally) be further improved by incorporating Li+-conducting solids like Li-Borates, Li- silicates, Li salts or complexes and the like.

Schematic Li-polymer battery.

Schematic Li-polymer battery.

Reticulated Foam-Fiber Composites

Title: A RETICULATED OPEN-CELL FOAM MODIFIED BY FIBERS EXTENDING ACROSS AND BETWEEN THE CELLS OF SAID FOAM AND PREPARATION METHODS THEREOF

 Number/Link: WO2013010245

Applicant/Assignee: EPIC VENTURES INC

Publication date: 24-01-2013

Gist”: Reticulated polyurethane foams containing fibers extending across and between cells. The foams can then be impregnated with metals (Nickel) and the polymer pyrolized resulting in porous metal structures useful in batteries.

Why it is interesting:  Reticulated foams (i.e. foams consisting only of a ‘strut skeleton’ and having no cell membranes) are well known, but the application is not clear about which process is to be used in this case, neither does it provide an example of a formulation. Chopped metal, glass or carbon  fibers are added to the foam-forming composition supposedly ‘resulting’ in a reticulated foam/fibre composite.  The fibers extend over about 5 cell diameters (e.g. 1-1.5 mm ) and are used in 10-30% v/v. Foams like this could be interesting for filtration, heat exchange and especially sound absorption -with  the fibers adding extra “tortuosity”. The patent is mainly concerned with the subsequent production of metal foams for use in batteries e.g.

Reticulated Foams with Fibers

Reticulated Foam with Fibers

  • Pages

  • Categories

  • Enter your email address to follow this blog and receive notifications of new posts by email.

    Join 1,085 other followers

  • Follow Innovation in PU on Twitter