US 12,224,422 B2 · Fabrication of lithium battery dry electrodes

Abstract

A solventless method of making a dry electrode for an electrochemical cell is provided. A solventless electrode material mixture includes 85-99% electrode active material and from 0-10% conductive carbon additive. A polymer binder system is present from 1-15%. The polymer binder system includes one or more polymer binders. The electrode material mixture is mixed at a temperature greater than a softening point or a melting point of at least one polymer binder of the polymer binder system. The electrode material mixture is kneaded into an electrode material dough. The electrode material dough is formed into an electrode material sheet. At least a portion of the electrode material sheet is affixed to a metal current collector to form an electrode.

Claims10

Dependent claims

A method of preparing a dry electrode layer for a lithium ion battery comprising:

providing a solventless electrode precursor dough to a roller apparatus including electrode active material particles and a binder system including at least one binder, the dough being heated to at a temperature above the melting point of at least one binder of the binder system;
rolling the solventless electrode precursor dough in the roller apparatus, the roller apparatus including a roller and having at least two-axis motion and positioning, including a horizontal axis and a vertical axis;
reducing a thickness of the solventless electrode precursor dough with the roller to create an active material layer;
combining the active material layer with a current collector to create the dry electrode for a lithium ion battery.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

17/530,496Filed 19 Nov 2021 · us provisional application

Priority

1 Dec 2020

Published

US 2022/0173369 A12 Jun 2022

Granted

11 Feb 2025

Term ends

Not estimatedThe source records don’t support an estimate.

Classification11 codes

H01M 4/0435
Involving compressing or compaction: rolling or calendering
H01M 4/139
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof: processes of manufacture
H01M 4/5825
Of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures,…:…
H01M 4/587
Carbonaceous material, e.g. graphite-intercalation compounds or CFx: for inserting or intercalating light metals

Fabrication of lithium battery dry electrodes

Life of this patent

Fabrication of lithium battery dry electrodes

Life of this patent

Abstract

Claims10