Method of manufacturing electrode for lithium secondary battery and electrode manufactured using the same

Patent metadata

Field	Value
Publication number	US-9673444-B2
Application number	US-201414483569-A
Country	US
Kind code	B2
Filing date	Sep 11, 2014
Priority date	Apr 17, 2012
Publication date	Jun 6, 2017
Grant date	Jun 6, 2017

Abstract

Disclosed is a method of manufacturing an electrode for a secondary battery including an electrode mixture including an electrode active material, binder and conductive material coated on a current collector. Provided are a method including surface-treating the current collector such that an aluminum oxide (Al 2 O 3 ) layer of 40 nm or less is formed on the current collector so as to enhance adhesion between the electrode mixture and the current collector, and an electrode for a secondary battery manufactured using the same.

First claim

The invention claimed is:

1. A method of manufacturing an electrode for a secondary battery comprising an electrode mixture comprising an electrode active material, binder and conductive material coated on an aluminum current collector, the method comprising surface-treating the current collector via thermal treatment at 100 to 500° C. under an oxygen atmosphere of 1 to 150 mTorr to form an aluminum oxide (Al 2 O 3 ) layer of 10 nm to 40 nm on the current collector wherein adhesion between the electrode mixture and the current collector is enhanced.

2. The method according to claim 1 comprising treating a surface of the current collector to form an aluminum oxide (Al 2 O 3 ) layer of 20 to 30 nm on the current collector.

3. The method according to claim 1 , wherein the thermal treatment is performed at 200 to 450° C. under an oxygen atmosphere of 30 to 100 mTorr.

4. The method according to claim 1 , wherein an electrode is a cathode or anode, or a cathode and anode.

5. The method according to claim 4 , wherein the cathode comprises, as a cathode active material, a spinel-structure lithium metal oxide represented by Formula 1 below:
Li x M y Mn 2-y O 4-z A z   (1)

wherein 0.9≦x≦1.2, 0<y<2, and 0≦z<0.2,
M is at least one element selected from the group consisting of Al, Mg, Ni, Co, Fe, Cr, V, Ti, Cu, B, Ca, Zn, Zr, Nb, Mo, Sr, Sb, W, Ti, and Bi; and
A is at least one monovalent or divalent anion.

6. The method according to claim 5 , wherein the lithium metal oxide is represented by Formula 2 below:
Li x Ni y Mn 2-y O 4   (2)

wherein 0.9≦x≦1.2, and 0.4≦y≦0.5.

7. The method according to claim 6 , wherein the lithium metal oxide is LiNi 0.5 Mn 1.5 O 4 or LiNi 0.4 Mn 1.6 O 4 .

8. The method according to claim 4 , wherein the anode comprises, as an anode active material, a lithium metal oxide represented by Formula 3 below:
Li a M′ b O 4-c A c   (3)

wherein M′ is at least one element selected from the group consisting of Ti, Sn, Cu, Pb, Sb, Zn, Fe, In, Al, and Zr;
0.1≦a≦4 and 0.2≦b≦4 in which a and b is determined according to oxidation number of M′;
0≦c<0.2 in which c is determined according to oxidation number of A; and
A is at least one monovalent or divalent anion.

9. The method according to claim 8 , wherein the lithium metal oxide is represented by Formula 4 below:
Li a Ti b O 4   (4)

wherein 0.5≦a≦3 and 1≦b≦2.5.

10. The method according to claim 9 , wherein the lithium metal oxide is Li 1.33 Ti 1.67 O 4 or LiTi 2 O 4 .

11. An electrode for a secondary battery comprising an electrode mixture comprising an electrode active material, binder and conductive material coated on an aluminum current collector wherein an aluminum oxide (Al 2 O 3 ) layer of greater than or equal to 10 nm and less than 20 nm is formed on the current collector via thermal treatment at 100 to 500° C. under an oxygen atmosphere of 1 to 150 mTorr.

12. The electrode according to claim 11 , wherein the electrode active material is a cathode active material or anode active material, or a cathode active material and anode active material wherein the cathode active material comprises a spinel-structure lithium metal oxide represented by Formula 1 below spinel and the anode active material comprises an oxide represented by Formula 3 below:
Li x M y Mn 2-y O 4-z A z   (1)

Li a M′ b O 4-c A c   (3)

wherein 0.9≦x≦1.2, 0<y<2 and 0≦z<0.2;
M is at least one element selected from the group consisting of Al, Mg, Ni, Co, Fe, Cr, V, Ti, Cu, B, Ca, Zn, Zr, Nb, Mo, Sr, Sb, W, Ti and Bi;
A is at least one monovalent or divalent anion;
M′ is at least one element selected from the group consisting of Ti, Sn, Cu, Pb, Sb, Zn, Fe, In, Al and Zr;
0.1≦a≦4 and 0.2≦b≦4 in which a and b are determined according to oxidation number of M′;
0≦c<0.2 in which c is determined according to oxidation number of A; and
A is at least one monovalent or divalent anion.

13. A secondary battery comprising the electrode according to claim 11 .

14. The secondary battery according to claim 13 , wherein the secondary battery is a lithium secondary battery.

15. A battery module comprising the secondary battery according to claim 14 as a unit battery.

16. A battery pack comprising the battery module according to claim 15 .

17. A device comprising the battery pack according to claim 16 .

18. The device according to claim 17 , wherein the device is an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a system for storing power.

19. The method according to claim 1 comprising treating a surface of the current collector to form an aluminum oxide (Al 2 O 3 ) layer of greater than or equal to 10 nm and less than 20 nm on the current collector.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Daehong
• Lee Jae Hyun
• Park Tae Jin

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/502

  for non-aqueous cells (H01M4/505 takes precedence) · CPC title

• H01M4/667

  in the form of layers, e.g. coatings · CPC title

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• H01M10/052

  Li-accumulators · CPC title