IP Library › Patent Application 18815307
Patent Application
App. No. 18/815,307

MULTI-LAYER NEGATIVE ELECTRODE COMPRISING NATURAL GRAPHITE AND ARTIFICIAL GRAPHITE AND LITHIUM SECONDARY BATTERY COMPRISING THE SAME

Loading inventors, assignments & file history…
Monitor This Case
Get email alerts when status or documents change.
Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US None
App. No.
18/815,307
Abstract

The present disclosure relates to a multilayer negative electrode comprising a negative electrode current collector configured to transfer electrons between an outer lead and a negative electrode active material, a first negative electrode mixture layer formed on one surface or both surfaces of the current collector and containing natural graphite as a negative electrode active material and a second negative electrode mixture layer formed on the first negative electrode mixture layer and containing artificial graphite as a negative electrode active material, and a lithium secondary battery including the same.

Claims (24)

1 . A multilayer negative electrode comprising:

a negative electrode current collector configured to transfer electrons between an outer lead and a negative electrode active material;

a first negative electrode mixture layer formed on one surface or both surfaces of the negative electrode current collector and comprising natural graphite as a negative electrode active material; and

a second negative electrode mixture layer formed on the first negative electrode mixture layer and comprising artificial graphite as a negative electrode active material,

wherein the natural graphite has an average particle diameter (D50) of 5 μm to 30 μm.

2 . The multilayer negative electrode of claim 1 , wherein the natural graphite has a tap density of 0.9 g/cc to 1.3 g/cc.

3 . The multilayer negative electrode of claim 1 , wherein the natural graphite has a tap density of 0.92 g/cc to 1.15 g/cc.

4 . The multilayer negative electrode of claim 1 , the natural graphite has an average particle diameter (D 50 ) of 8 μm to 20 μm.

5 . The multilayer negative electrode of claim 1 , wherein a ratio of I 110 to I 003 of particles of the natural graphite at XRD diffraction is 20 to 40.

6 . The multilayer negative electrode of claim 1 , wherein a ratio of I 110 to I 003 of particles of the natural graphite at XRD diffraction is 20.5 to 36.0.

7 . The multilayer negative electrode of claim 1 , wherein the natural graphite has a specific surface area (BET) of 2 m 2 /g to 8 m 2 /g.

8 . The multilayer negative electrode of claim 1 , wherein the natural graphite has a specific surface area (BET) of 2.1 m 2 /g to 4 m 2 /g.

9 . The multilayer negative electrode of claim 1 , wherein the natural graphite is flake graphite, vein graphite, or amorphous graphite.

10 . The multilayer negative electrode of claim 1 , wherein the second negative electrode mixture layer further comprises natural graphite.

11 . The multilayer negative electrode of claim 1 , wherein the first negative electrode mixture layer further comprises artificial graphite.

12 . The multilayer negative electrode of claim 1 , wherein an amount of the artificial graphite is greater than an amount of the natural graphite based on a total amount of the first negative electrode mixture layer and second negative electrode mixture layer.

13 . The multilayer negative electrode of claim 1 , wherein a weight ratio of the first negative electrode mixture layer to the second negative electrode mixture layer is 1:9 to 2:1

14 . The multilayer negative electrode of claim 1 , wherein the artificial graphite has an average particle diameter (D 50 ) of 8 μm to 30 μm.

15 . The multilayer negative electrode of claim 1 , wherein the artificial graphite has a tap density of 0.7 g/cc to 1.1 g/cc.

16 . The multilayer negative electrode of claim 1 , wherein a ratio of I 110 to I 003 of particles of the artificial graphite at XRD diffraction is 5 to 20.

17 . The multilayer negative electrode of claim 1 , wherein the artificial graphite is 0.5 m 2 /g to 5 m 2 /g in a range in which a specific surface area (BET) of the artificial graphite is smaller than that of the natural graphite.

18 . The multilayer negative electrode of claim 1 , wherein the artificial graphite is in a form of a powder, a flake, a block, a plate, or a rod.

19 . The multilayer negative electrode of claim 1 . The multilayer negative electrode of claim 1 , wherein at least one of the natural graphite and the artificial graphite is pitch-coated.

20 . A lithium secondary battery comprising the multilayer negative electrode according to claim 1 .