Electrode for rechargeable lithium battery, and rechargeable lithium battery including same

Patent metadata

Field	Value
Publication number	US-11075389-B2
Application number	US-201816142621-A
Country	US
Kind code	B2
Filing date	Sep 26, 2018
Priority date	Nov 7, 2017
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

Abstract

A rechargeable lithium battery includes a metal-containing foam current collector, and an active mass that fills in the metal-containing foam current collector, the active mass including an active material. The electrode includes a central region and a surface region. The central region corresponds to a ±5% upper and lower area with a reference to a central thickness line of the electrode. A volume ratio of the metal and the active material in the central region is different from a volume ratio of the metal and the active material in the surface region.

First claim

What is claimed is:

1. An electrode for a rechargeable lithium battery, the electrode comprising:
a metal-containing foam current collector; and
an active mass in the metal-containing foam current collector, the active mass including an active material,
wherein:
the electrode includes a central region and an outermost surface region, the central region corresponding to a ±5% upper and lower area with a reference to a central thickness line of the electrode, and the outermost surface region corresponding to a depth of 10% from an outermost surface of the metal-containing foam current collector in a direction toward the central region,
the metal-containing foam current collector and the active material are each present in a volume ratio throughout each of the central region and the outermost surface region, the volume ratio being a ratio of a volume of metal in the metal-containing foam current collector to a volume of the active material,
the active material is present with a concentration gradient such that a concentration increases from the central region to the outermost surface region,
in the central region, the volume ratio is in a range of 90:10 to less than 100:greater than 0, and
in the outermost surface region, the volume ratio is in a range of 10:90 to 1:99.

2. The electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the active material is present at a uniform concentration in the outermost surface region.

3. The electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the electrode further includes an active mass layer on the outermost surface region, the active mass layer including an active material.

4. The electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the metal-containing foam current collector is a Cu-containing foam current collector.

5. The electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the active material is a Si-based material, a Sn-based material, or a combination thereof.

6. A rechargeable lithium battery, comprising
a first electrode, wherein the first electrode is the electrode as claimed in claim 1 ;
a second electrode; and
an electrolyte.

7. The rechargeable lithium battery as claimed in claim 6 , wherein the first electrode is a negative electrode and the second electrode is a positive electrode.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Eom Hyeri
• Lee Seungjae
• Han Da-Un

Classifications

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01M4/13 Primary

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

• H01M4/808 Primary

  Foamed, spongy materials · CPC title

• H01M4/387

  Tin or alloys based on tin · CPC title

• H01M4/661

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title