Negative electrode for lithium ion battery and lithium ion battery

Patent metadata

Field	Value
Publication number	US-10930920-B2
Application number	US-201716346707-A
Country	US
Kind code	B2
Filing date	Nov 7, 2017
Priority date	Nov 7, 2016
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

To provide a negative electrode for a lithium ion battery having high energy density and excellent rapid charging characteristics.
A negative electrode for a lithium ion battery, the negative electrode including a negative electrode current collector, a negative electrode active material layer formed on the surface of the negative electrode current collector, and a non-aqueous liquid electrolyte including an electrolyte containing lithium ions and a non-aqueous solvent, in which the negative electrode active material layer includes a negative electrode active material and voids, the voids are filled with the non-aqueous liquid electrolyte, and a proportion of the battery capacity based on a total amount of lithium ions in the non-aqueous liquid electrolyte existing in the negative electrode active material layer with respect to the battery capacity based on a total amount of the negative electrode active material is 3% to 17%.

First claim

The invention claimed is:

1. A negative electrode for a lithium ion battery, the negative electrode comprising:
a negative electrode current collector;
a negative electrode active material layer formed on a surface of the negative electrode current collector; and
a non-aqueous liquid electrolyte including an electrolyte containing lithium ions and a non-aqueous solvent,
wherein the negative electrode active material layer includes a negative electrode active material and voids,
the voids are filled with the non-aqueous liquid electrolyte,
a proportion of a battery capacity based on a total amount of lithium ions in the non-aqueous liquid electrolyte existing in the negative electrode active material layer with respect to a battery capacity based on a total amount of the negative electrode active material is 5 to 17%,
the film thickness of the negative electrode active material layer is more than or equal to 150 μm to less than or equal to 1,500 μm, and
the content of a binder in the negative electrode active material layer is 1% by weight or less.

2. The negative electrode for a lithium ion battery according to claim 1 , wherein a total volume of the voids is 35% to 60% by volume of a total volume of the negative electrode active material layer.

3. The negative electrode for a lithium ion battery according to claim 1 , wherein a concentration of the electrolyte of the non-aqueous liquid electrolyte is 2 to 5 mol/L.

4. The negative electrode for a lithium ion battery according to claim 1 , wherein the electrolyte is a sulfonylimide-based electrolyte having a fluorine atom.

5. The negative electrode for a lithium ion battery according to claim 1 , wherein the electrolyte includes at least LiN(FSO 2 ) 2 .

6. The negative electrode for a lithium ion battery according to claim 1 , wherein the electrolyte consists of LiN(FSO 2 ) 2 .

7. The negative electrode for a lithium ion battery according to claim 1 , wherein the negative electrode current collector is a resin current collector including an electrically conductive material and a resin.

8. The negative electrode for a lithium ion battery according to claim 1 , wherein the negative electrode active material is a coated negative electrode active material in which a portion or an entirety of a surface of the negative electrode active material is coated with a coating layer including a polymer compound.

9. A lithium ion battery using the negative electrode for a lithium ion battery according to claim 1 .

10. The negative electrode for a lithium ion battery according to claim 1 , wherein the negative electrode active material layer does not contain a binder.

11. The negative electrode for a lithium ion battery according to claim 1 , wherein the negative electrode active material contains a carbon-based material.

12. The negative electrode for a lithium ion battery according to claim 11 , wherein the carbon-based material contains non-graphitizable carbon.

Assignees

• Nissan Motor

Inventors

• Minami Kazuya
• Nakashima Yusuke
• Ohsawa Yasuhiko
• Kusachi Yuki
• Satou Hajime
• Akama Hiroshi
• Horie Hideaki

Classifications

• H01M10/0568

  characterised by the solutes · CPC title

• H01M4/13 Primary

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

• H01M4/662 Primary

  Alloys (collectors of lead alloys H01M4/685) · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2004/021

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