Method for drying organic liquid electrolytes

• US 20040096746A1
• Filed: 06/13/2003
• Published: 05/20/2004
• Est. Priority Date: 09/27/2000
• Status: Abandoned Application

• Current Assignee: Chemetall GmbH (BASF SE), Somerset Pharmaceuticals, Inc. (Pfizer Inc.)
• Original Assignee: Somerset Pharmaceuticals, Inc. (Pfizer Inc.)
• Inventors: Schade, Klaus, Wietelmann, Ulrich, Lischka, Uwe
• Application Number:
  US10/381,126
• Publication Number:
  US 20040096746A1
• Time in Patent Office: Days
• US Class Current: 429/324
• CPC Class Codes: B01D 15/00 Separating processes involving the treatment of liquids with solid sorbents using liquid sorbents B01D11/00; ion exchange processes or materials, sorbent materials in general B01J, e.g. sorbents for chromatography B01J20/281; for investigating or analysing materials G01N30/00; Apparatus therefor
• CPC Class Codes: B01J 20/04 comprising compounds of alkali metals, alkaline earth metals or magnesium
• CPC Class Codes: H01G 11/04 Hybrid capacitors
• CPC Class Codes: H01G 11/20 Reformation or processes for removal of impurities, e.g. scavenging
• CPC Class Codes: H01G 11/34 characterised by carbonisation or activation of carbon
• CPC Class Codes: H01G 11/58 Liquid electrolytes
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0566 Liquid materials
• CPC Class Codes: H01M 6/162 characterised by the electrolyte
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors

Abstract

A method is described for removing water and other protic impurities from an organic liquid electrolyte, wherein the organic liquid electrolyte is brought into contact with one or more insoluble alkali metal hydride(s) and the insoluble reaction by-products formed thereby are separated off.

Claims

1. Method of removing water and other protic impurities from an organic liquid electrolyte, characterised in that the organic liquid electrolyte is brought into contact with one or more insoluble alkali metal hydride(s) and the insoluble reaction by-products formed thereby are separated off.

2. Method according to claim 1, characterised in that LiH and/or NaH is used as the alkali metal hydride.

3. Method according to claim 2, characterised in that LiH alone is used as the alkali metal hydride.

4. Method according to any one of claims 1 to 3, characterised in that the content of protic compounds in the liquid electrolyte to be dried is <

0.6 mmol/g.

5. Method according to any one of claims 1 to 4, characterised in that the temperature is from −

20 to 150°

C.

6. Method according to claim 5, characterised in that the temperature is from 0 to 90°

C.

7. Method according to any one of claims 1 to 6, characterized in that the amount of metal hydride corresponds at least to the stoichiometric amount of protic impurities.

8. Method according to claim 7, characterised in that the amount of metal hydride corresponds to from 2 to 100 times the stoichiometric amount of protic impurities.

9. Method according to any one of claims 1 to 8, characterised in that the metal hydride is activated by milling under an inert gas atmosphere.

10. Method according to any one of claims 1 to 9, characterized in that the liquid electrolyte is stirred with the metal hydride.

11. Method according to any one of claims 1 to 9, characterised in that the liquid electrolyte passes over a fixed bed containing the metal hydride.

12. Method according to any one of claims 1 to 11, characterised in that the insoluble reaction by-products are separated off by filtration or centrifugation.

13. Use of the organic liquid electrolyte dried according to any one of claims 1 to 12 for electrolytic cells or supercapacitors.

14. Use of the organic liquid electrolyte dried according to any one of claims 1 to 12 for lithium batteries.