Process for manufacturing battery components

Patent metadata

Field	Value
Publication number	US-10256498-B2
Application number	US-201214127379-A
Country	US
Kind code	B2
Filing date	Jun 15, 2012
Priority date	Jun 23, 2011
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

Abstract

The present invention pertains to a process for manufacturing a component of a secondary battery, said process comprising the following steps: (i) preparing a liquid composition comprising: —a liquid medium selected from the group consisting of aliphatic ketones, cycloaliphatic ketones, cycloaliphatic esters and mixtures thereof, and —at least one fluorinated polymer [polymer (F)] comprising recurring units derived from vinylidene fluoride (VDF), hexafluoropropylene (HFP) and at least one (meth)acrylic monomer (MA) having formula (I), wherein: —R 1 , R 2 and R 3 , equal to or different from each other, are independently selected from a hydrogen atom and a C 1 -C 3 hydrocarbon group, and —R x , is a hydrogen atom or a C 1 -C 5 hydrocarbon moiety comprising at least one functional group selected from a hydroxyl, a carboxyl, an epoxide, an ester and an ether group; and (ii) processing said liquid composition to provide a film.

First claim

The invention claimed is:

1. A process for manufacturing a component of a secondary battery, said process comprising:
(i) preparing a liquid composition, wherein the liquid composition comprises:
a liquid medium selected from the group consisting of aliphatic ketones, cycloaliphatic ketones, cycloaliphatic esters and mixtures thereof, and
at least one fluorinated polymer (F), wherein polymer consists of:
(a) from 1.5% to 3.5% by moles of recurring units derived from hexafluoropropylene (HFP),
(b) from 0.5% to 1.5% by moles of recurring units derived from at least one (meth)acrylic monomer (MA) of formula (III):

wherein:
R″ 1 , R″ 2 and R″ 3 are hydrogen atoms, and
R″ x is a hydrogen atom or a C 1 -C 5 hydrocarbon moiety comprising at least one hydroxyl group, and

(c) recurring units derived from vinylidene fluoride (VDF) in an amount that is complement to 100% by moles of total recurring units,

wherein at least 8% by weight of polymer (F), based on the total volume of the liquid composition, dissolves in the liquid medium at temperatures comprised between 20° C. and 80° C.; and
(ii) processing said liquid composition to provide a film.

2. The process according to claim 1 , wherein at least 10% by weight of polymer (F), based on the total volume of the liquid composition, dissolves in the liquid medium at temperatures comprised between 20° C. and 80° C.

3. The process according to claim 1 , wherein the liquid composition is an electrode-forming composition further comprising a powdery electrode material and, optionally, one or more additives which is processed by coating and drying a film onto a metal substrate to provide an electrode.

4. The process according to claim 1 , wherein the film obtained from step (ii) is further processed by means of at least one of irradiation, film expansion, template leaching, solution precipitation techniques to provide a porous separator.

5. The process according to claim 1 , wherein the film obtained from step (ii) is further processed by casting and/or melt forming to provide a dense separator.

6. The process according to claim 1 , wherein the film obtained from step (ii) is further processed by coating and drying onto a separator to provide a composite separator.

7. The process according to claim 6 , wherein the composite separator is obtained by coating and drying the film obtained from step (ii) onto a separator made of a polyolefin.

8. The process according to claim 7 , wherein the polyolefin is selected from polyethylene, polypropylene and mixtures thereof.

9. The process according to claim 1 , wherein the liquid medium is selected from acetone, methyl ethyl ketone, cyclohexanone, γ-butyrolactone, γ-valerolactone and mixtures thereof.

10. The process according to claim 1 , wherein the (meth)acrylic monomer (MA) is selected from:

and mixtures thereof.

11. The process according to claim 1 , wherein the (meth)acrylic monomer (MA) is acrylic acid or hydroxyethyl acrylate.

Assignees

• Abusleme Julio A
• Pieri Riccardo
• Fossati Paolo
• Solvay Specialty Polymers It

Inventors

• Abusleme Julio A
• Pieri Riccardo
• Fossati Paolo

Classifications

• H01M10/04 Primary

  Construction or manufacture in general (H01M10/058, H01M10/12, H01M10/28, H01M10/38 take precedence) · CPC title

• H01M50/417

  Polyolefins · CPC title

• H01M50/406

  Moulding; Embossing; Cutting · CPC title

• H01M50/403 Primary

  Manufacturing processes of separators, membranes or diaphragms · CPC title

• C08K5/151

  having one oxygen atom in the ring · CPC title