Anode for a cell of a lithium-ion battery, its manufacturing process and the battery incorporating it

Patent metadata

Field	Value
Publication number	US-9666855-B2
Application number	US-201514813637-A
Country	US
Kind code	B2
Filing date	Jul 30, 2015
Priority date	Mar 13, 2012
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

An anode usable in a cell of a lithium-ion battery comprising an electrolyte based on a lithium salt and a non-aqueous solvent, to a process for manufacturing this anode and to a lithium-ion battery having one or more cells incorporating this anode. This anode is based on a polymer composition, obtained by melt processing and without solvent evaporation, that is the product of a hot compounding reaction between an active material and additives having a polymer binder and an electrically conductive filler. The binder is based on at least one crosslinked elastomer and the additives furthermore include at least one non-volatile organic compound usable in the electrolyte solvent, the composition advantageously includes the active material in a mass fraction greater than or equal to 85%.

First claim

The invention claimed is:

1. Process for manufacturing an anode usable in a cell of a lithium-ion battery comprising an electrolyte based on a lithium salt and a non-aqueous electrolyte solvent, the anode being based on a polymer composition obtained by melt processing and without solvent evaporation, that is the product of a hot compounding reaction between an active material and additives comprising a polymer binder and an electrically conductive filler, wherein said binder is based on at least one crosslinked elastomer and wherein said additives furthermore comprise at least one non-volatile organic compound which has a boiling point above 150° C. at an atmospheric pressure of 1.013×10 5 Pa, is in a solid state at room temperature and which is usable in said non-aqueous electrolyte solvent, the composition comprising said active material in a mass fraction greater than or equal to 85%, wherein said process comprises:
a) melt compounding, without said solvent evaporation, in an internal mixer or an extruder, of said active material and said additives and said at least one organic compound in said solid state in order to obtain said composition in a crosslinkable state; and
b) crosslinking and optionally hot forming said composition, in order to obtain a crosslinked composition.

2. Manufacturing process according to claim 1 , wherein step a) is carried out by compounding said binder into a powder premix of other ingredients of the composition, at a temperature between 80° C. and 120° C. in an internal mixer.

3. Manufacturing process according to claim 2 , wherein step b) is carried out by hot pressing said crosslinkable composition.

4. Manufacturing process according to claim 2 , wherein the process then comprises a step c) of rolling said crosslinked composition so as to deposit it on a metallic current collector with which said anode is equipped.

5. Manufacturing process according to claim 2 , wherein said active material comprises at least one compound or complex selected from the group consisting of graphite and a lithiated titanium oxide.

6. Manufacturing process according to claim 1 , wherein step b) is carried out by hot pressing said crosslinkable composition.

7. Manufacturing process according to claim 1 , wherein the process then comprises a step c) of rolling said crosslinked composition so as to deposit it on a metallic current collector with which said anode is equipped.

8. Manufacturing process according to claim 1 , wherein said active material comprises at least one compound or complex selected from the group consisting of graphite and a lithiated titanium oxide.

Assignees

• Hutchinson

Inventors

• Voillequin Baptiste
• Ayme-Perrot David
• Dufour Bruno
• Sonntag Philippe

Classifications

• H01M10/0561

  the electrolyte being constituted of inorganic materials only · CPC title

• 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

• H01M4/1399

  of electrodes based on electro-active polymers · CPC title

• H01M4/1397

  of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title