Process for the degradation of a poly(alkene carbonate), uses for preparing a lithium-ion battery electrode and the sintering of ceramics

Patent metadata

Field	Value
Publication number	US-12199266-B2
Application number	US-202117547414-A
Country	US
Kind code	B2
Filing date	Dec 10, 2021
Priority date	Oct 28, 2016
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

Provided is a process for the degradation of at least one polymer of an alkene carbonate, a polymeric composition for a lithium-ion battery electrode having a degradation residue obtained by this process, a process for the preparation thereof, an electrode and a battery incorporating it and a degradation process for the sintering of ceramics.
The degradation process includes a reaction at 120° C. and 270° C., and under air of a primary amine with a poly(alkene carbonate) polyol, which depolymerizes it in order to obtain a non-polymeric degradation residue.
This composition includes an active material, an electrically conductive filler, a polymeric binder and a residue from the degradation under air between 120° C. and 270° C. of a sacrificial phase which includes the polymer and which has been melt blended beforehand with the active material, with the filler and with the binder in order to obtain a precursor mixture of the composition.

First claim

The invention claimed is:

1. Polymeric composition for a lithium-ion battery electrode, the composition comprising:
an active material capable of producing a reversible insertion/deinsertion of lithium in the said electrode,
an electrically conductive filler,
a polymeric binder, and
a non-polymeric residue configured from degradation, under air and at a degradation temperature of between 120° C. and 270° C., of a sacrificial polymeric phase which comprises at least one polymer of an alkene carbonate and which has been melt blended beforehand with the said active material, with the said filler and with the said binder in order to obtain a precursor mixture of the composition,
wherein the non-polymeric degradation residue comprises the product of a depolymerization reaction, by a primary amine which the said precursor mixture comprises, of the said at least one polymer of an alkene carbonate which is a poly(alkene carbonate) polyol.

2. The composition according to claim 1 , in which the said non-polymeric degradation residue is a liquid/solid mixture which comprises:
between 10% and 90% by weight of a first residue comprising a carbonate of the said alkene and/or oligomeric traces of the said poly(alkene carbonate) polyol, and
between 90% and 10% by weight of a second residue comprising a degradation product of the said primary amine.

3. The composition according to claim 1 , in which the composition comprises the said non-polymeric degradation residue according to a fraction by weight of less than 5%.

4. The composition according to claim 1 , in which the said sacrificial polymeric phase comprises:
according to a fraction by weight in the said phase of greater than 50%, the said poly(alkene carbonate) polyol, which is a linear aliphatic diol, more than 50 mol % of the end groups of which are hydroxyl groups with which the said primary amine interacts, and which exhibits a weight-average molecular weight of between 500 g/mol and 5000 g/mol, and
according to a fraction by weight in the said phase of less than 50%, another said at least one polymer of an alkene carbonate with a weight-average molecular weight of between 20 000 g/mol and 400 000 g/mol.

5. The composition according to claim 1 , in which the said non-polymeric degradation residue comprises the said product of the said reaction which is carried out without organometallic catalyst in an oven in contact with a stream of air at atmospheric pressure of 1.013×10 5 Pa.

6. Electrode capable of forming a lithium-ion battery anode or cathode, wherein the electrode comprises at least one film comprising the composition according to claim 1 and a metal current collector in contact with the said at least one film.

7. Lithium-ion battery comprising at least one cell comprising an anode, a cathode and an electrolyte based on a lithium salt and on a non-aqueous solvent, wherein the said anode and/or the said cathode comprises an electrode according to claim 6 .

8. Process for the preparation of a composition according to claim 1 , wherein the process successively comprises:
a) melt blending, without evaporation of solvent, the said active material, the said binder, the said electrically conductive filler and the said sacrificial polymeric phase which exhibits a thermal decomposition temperature lower by at least 20° C. than that of the said binder, in order to obtain a precursor mixture of the said composition,
b) depositing, in the film form, the said precursor mixture on a metal current collector, then
c) degrading the said sacrificial polymeric phase at the said temperature of between 120° C. and 270° C., comprising the said reaction under air of the said primary amine with the said at least one polymer of an alkene carbonate.

9. The process according to claim 8 , in which stage c) is carried out without organometallic catalyst between 140° C. and 250° C. for a period of time of between 30 minutes and 1 hour in an oven in communication with a stream of air external to the said oven, the said stream of air being capable of extracting the said poly(alkene carbonate) polyol as it is degraded.

10. The process according to claim 8 , in which the said sacrificial polymeric phase is present in the said precursor mixture according to a fraction by weight of between 20% and 45% and comprises:
according to a fraction by weight in the said phase of greater than 50%, the said poly(alkene carbonate) polyol, which is a linear aliphatic diol, more than 50 mol % of the end groups of which are hydroxyl groups with which the said primary amine interacts, and which exhibits a weight-average molecular weight of between 500 g/mol and 5000 g/mol, and
according to a fraction by weight in the said phase of less than 50%, another said at least one polymer of an alkene carbonate of or not of poly(alkene carbonate) polyol type with a weight-average molecular weight of between 20 000 g/mol and 400 000 g/mol.

11. The composition according to claim 3 , in which the composition comprises the said non-polymeric degradation residue according to a fraction by weight of between 0.1% and 2%.

12. The composition according to claim 4 , in which more than 80 mol % of the end groups of the linear aliphatic diol are hydroxyl groups with which the said primary amine interacts.

13. The composition according to claim 5 , in which the said reaction is carried out with a primary amine/poly(alkene carbonate) polyol(s) ratio by weight which is less than or equal to 10.

Assignees

• Hutchinson

Inventors

• Sonntag Philippe
• Dufour Bruno
• Prebe Arnaud

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/622

  being polymers · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• C08J2369/00

  Characterised by the use of polycarbonates; Derivatives of polycarbonates · CPC title

• C08J11/18 Primary

  by treatment with organic material · CPC title