Lithium free battery and method for preparing the same

Patent metadata

Field	Value
Publication number	US-12278377-B2
Application number	US-202117768436-A
Country	US
Kind code	B2
Filing date	May 7, 2021
Priority date	May 8, 2020
Publication date	Apr 15, 2025
Grant date	Apr 15, 2025

Abstract

A lithium free battery comprising a positive electrode, a negative electrode, a separator, and a non-aqueous lithium electrolyte, wherein the negative electrode includes a metal substrate including at least one metal selected from the group consisting of Mg, Ca, Al, Si, Ge, Sn, Pb, As, Sb, Bi, Ag, Zn, Cd, P and Hg; a lithium-metal alloy layer formed on the metal substrate; and a lithium plating layer formed on the lithium-metal alloy layer, and a method for preparing the same.

First claim

The invention claimed is:

1. A lithium free battery comprising a positive electrode, a negative electrode, a separator, and a non-aqueous lithium electrolyte,
wherein the negative electrode comprises:
a metal substrate including at least one metal selected from the group consisting of Mg, Ca, Al, Si, Ge, Sn, Pb, As, Sb, Bi, Ag, Zn, Cd, P and Hg;
a lithium-metal alloy layer formed on the metal substrate; and
a lithium plating layer formed on the lithium-metal alloy layer,
wherein the metal contained in the lithium-metal alloy layer is a metal contained in the metal substrate, and
wherein the metal substrate has a thickness of 3 μm to 100 μm.

2. The lithium free battery according to claim 1 , wherein:
the lithium-metal alloy layer and the lithium plating layer are formed by charging the lithium free battery.

3. The lithium free battery according to claim 2 , wherein:
a capacity per unit area in mAh/cm 2 of the positive electrode is larger than a capacity per unit area of the negative electrode.

4. The lithium free battery according to claim 1 , wherein the metal substrate comprises at least one metal selected from the group consisting of Si, Ge, Sn, Sb, Mg, Bi, As, Pb, P and Zn.

5. The lithium free battery according to claim 1 , wherein the metal substrate has a thickness of 10 μm to 80 μm.

6. The lithium free battery according to claim 1 , wherein the lithium-metal alloy layer and the lithium plating layer have a thickness of 0.1 μm or more, respectively.

7. A method for preparing the lithium free battery of claim 1 , the method comprising:
preparing a positive electrode by forming a positive electrode mixture layer on at least one surface of a positive electrode current collector;
preparing a preliminary negative electrode composed of a metal substrate including at least one metal selected from the group consisting of Mg, Ca, Al, Si, Ge, Sn, Pb, As, Sb, Bi, Ag, Zn, Cd, P and Hg;
preparing an electrode assembly by disposing a separator between the positive electrode and the preliminary negative electrode; and
housing the electrode assembly and the non-aqueous lithium electrolyte in a battery case, sealing the battery case, and then subjecting a result of the sealing of the battery case to charging,
wherein a capacity per unit area in mAh/cm 2 of the positive electrode is larger than a capacity per unit area of the negative electrode, and
wherein the metal substrate has a thickness of 3 μm to 100 μm.

8. The method according to claim 7 , wherein the metal substrate comprises at least one metal selected from the group consisting of Si, Ge, Sn, Sb, Mg, Bi, As, Pb, P and Zn.

Assignees

• Lg Energy Solution Ltd

Inventors

• YUN Hyunwoong
• Lee Jung Pil
• Hah Hoejin

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M10/058

  Construction or manufacture · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M4/13

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