FLEXIBLE BATTERY ELECTRODES AND THE PRODUCTION THEREOF

• US 20130209877A1
• Filed: 08/12/2011
• Published: 08/15/2013
• Est. Priority Date: 08/17/2010
• Status: Abandoned Application

• Current Assignee: VARTA Micro Innovation GmbH (VARTA AG)
• Original Assignee: VARTA Micro Innovation GmbH (VARTA AG)
• Inventors: Koller, Stefan, Kren, Harald, Droisner, Andrea
• Application Number:
  US13/816,866
• Publication Number:
  US 20130209877A1
• Time in Patent Office: Days
• US Class Current: 429/211
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 4/0404 by coating on electrode collectors
• CPC Class Codes: H01M 4/0435 Rolling or calendering
• CPC Class Codes: H01M 4/139 Processes of manufacture
• CPC Class Codes: H01M 4/38 of elements or alloys
• CPC Class Codes: H01M 4/386 Silicon or alloys based on silicon
• CPC Class Codes: H01M 4/387 Tin or alloys based on tin
• CPC Class Codes: H01M 4/463 Aluminium based
• CPC Class Codes: H01M 4/604 containing aliphatic main chain polymers
• CPC Class Codes: H01M 4/621 Binders
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A paste for producing electrodes for lithium ion batteries includes as electrochemically active material particles of at least one of a metal/semimetal selected from the group consisting of silicon, aluminium, antimony, tin, cobalt and carbon-based particles which intercalate lithium, a binder based on a polysaccharide, water as a solvent, and an aliphatic polyester having a molar mass of 150 to 500 g/mol or an hydroxycarboxylic ester having a molar mass of 150 to 500 g/mol as a plasticizer.

Claims

1-12. -12. (canceled)

13. A paste for producing electrodes for lithium ion batteries comprising:

electrochemically active material particles comprising at least one of a metal/semimetal selected from the group consisting of silicon, aluminium, antimony, tin, cobalt and carbon-based particles which intercalate lithium,

a binder based on a polysaccharide,

water as a solvent, and

an aliphatic polyester having a molar mass of 150 to 500 g/mol or an hydroxycarboxylic ester having a molar mass of 150 to 500 g/mol as a plasticizer.

14. The paste as claimed in claim 13, wherein the plasticizer has a boiling point of 120°

C. to 350°

C.

15. The paste as claimed in claim 13, wherein the plasticizer has a boiling point of 200°

C. to 300°

C.

16. The paste as claimed in claim 13, wherein the plasticizer is an aliphatic polyester or comprises an aliphatic polyester

having 7 to 12 carbon atoms,

consisting of the elements carbon (C), hydrogen (O) and oxygen (O),

having a molar mass of 150 to 300 g/mol and

a boiling point of 200°

C. to 300°

C.

17. The paste as claimed in claim 13, wherein the plasticizer is a hydroxycarboxylic ester or comprises a hydroxycarboxylic ester

having 7 to 12 carbon atoms,

consisting of the elements carbon (C), hydrogen (O) and oxygen (O),

having a molar mass of 50 to 300 g/mol and

a boiling point of 200°

C. to 300°

C.

18. The paste as claimed in claim 13, wherein the at least one plasticizer is glyceryl triacetate and/or triethyl citrate.

19. The paste as claimed in claim 13, wherein the binder is carboxymethylcellulose (CMC).

20. The paste as claimed in claim 13, further comprising a solubilizing or dissolution-promoting additive to increase solubility of the plasticizer in the solvent.

21. A process of producing electrodes for lithium ion batteries comprising

applying a paste as claimed in claim 13 to a current collector to form an electrode layer on the power lead,

heat treating the paste to at least partially remove solvent present in the layer,

pressing or calendering the electrode layer on the sheet-like current collector, and

optionally, heat treating the layer to remove residual solvent from the layer.

22. An electrode comprising:

a matrix composed of a binder based on a polysaccharide,

particles of at least one of a metal/semimetal selected from the group consisting of silicon, aluminium, antimony, tin, cobalt and carbon-based particles which intercalate lithium which are embedded in the matrix, and

an aliphatic polyester having a molar mass of 150 to 500 g/mol or an hydroxycarboxylic ester having a molar mass of 150 to 500 g/mol as a plasticizer.

23. The electrode as claimed in claim 22, which is a flat layer on a current collector.

24. A lithium on battery comprising an electrode as claimed in claim 22.