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-11233228-B2
Application number	US-201716344907-A
Country	US
Kind code	B2
Filing date	Oct 26, 2017
Priority date	Oct 28, 2016
Publication date	Jan 25, 2022
Grant date	Jan 25, 2022

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. A process for the degradation of at least one polymer of an alkene carbonate at a temperature of between 120° C. and 270° C., comprising a reaction under air of a primary amine with the at least one polymer which is a poly(alkene carbonate) polyol, the reaction depolymerizing the at least one polymer in order to obtain a non-polymeric degradation residue,
wherein the reaction is carried out in an oven in communication with a stream of air exterior to the oven, the stream of air extracting the at least one poly(alkene carbonate) polyol as it is degraded.

2. The process according to claim 1 , wherein the stream of air is formed of ambient air at atmospheric pressure of 1.013×10 5 Pa.

3. The process according to claim 1 , wherein the primary amine depolymerizes the at least one poly(alkene carbonate) polyol by the reaction without an organometallic catalyst in order to obtain the degradation residue which is vaporizable, the ratio by weight of the residue to the initial poly(alkene carbonate) polyol(s) being between 0.2% and 5%.

4. The process according to claim 3 , wherein the degradation residue is a liquid/solid mixture comprising:
between 10% and 90% by weight of a first residue comprising a carbonate of the alkene and/or oligomeric traces of the at least one poly(alkene carbonate) polyol, and
between 90% and 10% by weight of a second residue comprising a degradation product of the primary amine.

5. The process according to claim 3 , wherein, in order to obtain the degradation residue, the reaction is carried out between 130° C. and 260° C. for at most 2 hours.

6. The process according to claim 1 , wherein the primary amine is chosen from aliphatic or aromatic monoamines and polyamines exhibiting:
in the case where the primary amine is a monomer, a boiling point of greater than 180° C. and preferably equal to or greater than 200° C. at atmospheric pressure of 1.013×10 5 Pa, and
in the case where the primary amine is an oligomer or a polymer, a weight-average molecular weight of less than or equal to 2000 g/mol.

7. The process according to claim 6 , wherein the primary amine is a monomeric aliphatic monoamine chosen from non-volatile alkylamines.

8. The process according to claim 6 , wherein the primary amine is a monomeric aromatic monoamine chosen from anilines and aniline derivatives.

9. The process according to claim 6 , wherein the primary amine is an oligomeric or polymeric aliphatic polyamine of polyetheramine type.

10. The process according to claim 1 , wherein the at least one poly(alkene carbonate) polyol is a linear aliphatic diol, more than 50 mol % of the end groups of which are hydroxyl groups with which the primary amine interacts.

11. The process according to claim 10 , wherein the at least one poly(alkene carbonate) polyol is chosen from poly(ethylene carbonate) diols and poly(propylene carbonate) diols with a weight-average molecular weight of between 700 g/mol and 2000 g/mol.

12. The process according to claim 1 , wherein the primary amine/poly(alkene carbonate) polyol(s) ratio by weight for the reaction is less than or equal to 10% inclusive.

Assignees

• Hutchinson

Inventors

• Sonntag Philippe
• Dufour Bruno
• Prebe Arnaud

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• C04B35/634

  Polymers (C04B35/636 takes precedence) · CPC title

• C08J2369/00

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

• H01M4/139

  Processes of manufacture · CPC title