Method for the manufacture of electrodes

Patent metadata

Field	Value
Publication number	US-12489106-B2
Application number	US-202017601724-A
Country	US
Kind code	B2
Filing date	Apr 29, 2020
Priority date	May 3, 2019
Publication date	Dec 2, 2025
Grant date	Dec 2, 2025

Abstract

The present invention pertains to an electrode-forming composition, to use of said electrode-forming composition in a process for the manufacture of an electrode, to said electrode and to an electrochemical device comprising said electrode.

First claim

The invention claimed is:

1 . A composition [composition (C)] comprising:
from 0.5 wt. % to less than 20 wt. % of at least one semi-crystalline partially fluorinated polymer [polymer (F)] comprising recurring units derived from 1,1-difluoroethylene (VDF) and recurring units derived from at least one hydrogenated monomer comprising at least one carboxylic acid end group [monomer (MA)]; from 10 wt. % to less than 60 wt. % of at least one liquid medium [medium (L)] characterized by a boiling point equal to or higher than 150°° C., wherein said medium (L) is selected from the group consisting of organic carbonates, ionic liquids (IL), or combinations thereof; and at least 50 wt. % of at least one electro-active compound [compound (EA)]; wherein the above amounts are based on the total weight of said composition (C), and wherein said polymer (F) is characterized by an intrinsic viscosity higher than 0.05 L/g, the intrinsic viscosity being measured from the dropping time of a solution of said polymer (F) at 25° C. at a concentration of 0.2 g/dl in N.N-dimethylformamide using a Ubbelhode viscosimeter, and wherein the composition (C) is free from any polar solvent [solvent(S)].

2 . The composition (C) according to claim 1 , wherein said polymer (F) comprises recurring units derived from 1,1-difluoroethylene (VDF), recurring units derived from at least one hydrogenated monomer comprising at least one carboxylic acid end group [monomer (MA)], and recurring units derived from at least one partially or fully fluorinated monomer [monomer (F FH )], said monomer (F FH ) being different from VDF.

3 . The composition (C) according to claim 2 , wherein:
said monomer (MA) complies with the following chemical formula (II):

wherein:
R′ 1 , R′ 2 and R′ 3 are hydrogen atoms, and
R′ OH is a hydrogen atom or a C 1 -C 5 hydrocarbon moiety comprising at least one hydroxyl group;
and said monomer (F FH ) is selected from the group comprising:
—C 2 -C 8 perfluoroolefins;
—C 2 -C 8 hydrogenated fluoroolefins different from VDF;
—CH 2 ═CH—R f0 , wherein R f0 is a C 1 -C 6 perfluoroalkyl;
chloro- and/or bromo- and/or iodo-C 2 -C 6 fluoroolefins;
—CF 2 ═CFOX 0 , wherein X 0 is a C 1 -C 6 fluoro-or perfluoroalkyl; a C 1 -C 12 alkyl group, a C 1 -C 12 oxyalkyl group or a C 1 -C 12 (per) fluorooxyalkyl group having one or more ether groups; group -CF 2 OR f2 wherein R f2 is a C 1 -C 6 fluoro-or perfluoroalkyl group or a C 1 -C 6 (per) fluorooxylalkyl group having one or more ether groups;
—CF 2═ CFOY 0 ,
wherein Y 0 is a C 1 -C 12 alkyl group or (per) fluoroalkyl group, a C 1 -C 12 oxyalkyl group or a C 1 - C 12 (per) fluorooxyalkyl group having one or more ether groups, or a carboxylic or sulfonic acid group, in its acid, acid halide or salt form; or
fluorodioxoles.

4 . The composition (C) according to claim 1 , wherein said polymer (F) comprises:
recurring units derived from VDF and recurring units derived from at least one monomer (MA) [polymer (F*)]; or recurring units derived from VDF, recurring units derived from at least one monomer (MA), and recurring units derived from at least one monomer (F FH ) [polymer (F**).

5 . The composition (C) according to claim 4 , wherein:
said polymer (F*) comprises: at least 90% by moles of recurring units derived from VDF, from 0.05% to 10% by moles of recurring units derived from at least one monomer (MA); and said polymer (F**) comprises: at least 80% by moles of recurring units derived from VDF, from 0.01% to 10% by moles of recurring units derived from at least one monomer (MA), and from 0.1% to 15% by moles of at least one monomer (F FH ).

6 . The composition (C) according to claim 1 , wherein said composition (C) comprises a conductive compound [compound (C)].

7 . The composition (C) according to claim 6 , wherein said compound (C) is present in said composition (C) in an amount from 0.1 wt. % to 15 wt. % based on the total weight of said composition (C).

8 . The composition (C) according to claim 1 , wherein said composition (C) comprises a polymer [polymer (P)] comprising a backbone complying with the following formula:
—[(CH 2 ) x -CHR 1 -R 2]— wherein x is an integer from 1 to 3, R 1 is a hydrogen or methyl group; and R 2 is an oxygen atom or a group of formula —OC(═O)R 3, with R 3 being a hydrogen atom or a methyl group, and wherein said polymer (P) has a melting point (Tm) higher than 25° C. and lower than 120° C.

9 . The composition (C) according to claim 8 , wherein said polymer (P) is present in said composition (C) in an amount higher than 0.1 wt. % and lower than 20 wt. %, based on the total weight of said composition (C).

10 . The composition (C) according to claim 1 , said composition (C) comprising:
from 18 to 40.5 wt. % of said medium (L), optionally comprising at least one salt (M); from 2 to 14 wt. % of said polymer (F); from 52 to 82 wt. % of said compound (EA); from 0.5 to 10 wt. % of a conductive compound [compound (C)]; and optionally, from 3 to 5 wt. % of a polymer [polymer (P)] comprising a backbone complying with the following formula:
—[(CH 2 ) x -CHR 1 -R 2 ]—
wherein
x is an integer from 1 to 3,
R 1 is a hydrogen or methyl group; and
R 2 is an oxygen atom or a group of formula —OC(═O)R 3 , with R 3 being a hydrogen atom or methyl group, and
wherein said polymer (P) has a melting point (Tm) higher than 25° C. and lower than 120° C.

11 . The composition (C) according to claim 1 , said composition (C) comprising:
from 10 to 40 wt. % of said medium (L), said medium (L) comprising at least one organic carbonate as the only medium (L); from 2 to 14 wt. % of polymer (F**-1), wherein polymer (F**-1) comprises:
at least 80% by moles of recurring units derived from VDF,
from 0.01% to 10% by moles of recurring units derived from at least one monomer (MA), and
from 5% to 12% by moles of at least one monomer (FFH);
from 52 to 82 wt. % of said compound (EA); from 0.5 to 10 wt. % of a conductive compound [compound (C)]; and optionally, from 3 to 5 wt. % of a polymer [polymer (P)] comprising a backbone complying with the following formula:
—[(CH 2 ) x -CHR 1 -R 2 ]—
wherein
x is an integer from 1 to 3,
R 1 is a hydrogen or methyl group; and
R 2 is an oxygen atom or a group of formula —OC(═O)R 3, with R 3 being a hydrogen atom or methyl group, and
wherein said polymer (P) has a melting point (Tm) higher than 25° C. and lower than 120° C.

12 . A process for the manufacture of an assembly, said process comprising:
(a) providing a substrate; (b) providing composition (C) as defined in claim 11 in the form of pellets; (c) heating said composition (C) at a temperature higher than 100° C.; (d) extruding the composition (C) provided in step (b) onto the substrate provided in step (a), thereby providing an assembly comprising a substrate coated with at least one layer consisting of said composition (C).

13 . An assembly comprising:
at least one substrate, and directly adhered onto said substrate, at least one layer [layer (L1)] consisting of composition (C) of claim 1 , wherein said assembly is a positive electrode or a negative electrode.

14 . A secondary battery comprising:
a positive electrode, a negative electrode, and a membrane interposed between said positive electrode and said negative electrode, wherein at least one of said positive electrode

Assignees

• Syensqo Sa
• Torino Politecnico

Inventors

• Abusleme Julio A
• Biso Maurizio
• Frache Alberto
• Battegazzore Daniele
• Liberale Francesco

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/0525

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

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/623 Primary

  fluorinated polymers · CPC title