Electrode and secondary battery including the same

Patent metadata

Field	Value
Publication number	US-9786916-B2
Application number	US-201414489894-A
Country	US
Kind code	B2
Filing date	Sep 18, 2014
Priority date	Apr 18, 2012
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

Disclosed is an electrode for secondary batteries including an electrode mixture including an electrode active material, binder and conductive material coated on a current collector wherein a conductive material is coated to a thickness of 1 to 80 μm on the current collector and the electrode mixture is coated on a coating layer of the conductive material so as to improve electrical conductivity.

First claim

The invention claimed is:

1. An anode for secondary batteries comprising:
a coating layer of a conductive material having a thickness of 30 to 80 μm on a current collector, and
an anode mixture comprising an anode active material, a binder and the same conductive material of the coating layer,
wherein the conductive material is at least one of carbon nanotube or graphene.

2. The anode according to claim 1 , wherein the coating layer is coated on 40 to 90% of a total area of the current collector.

3. The anode according to claim 1 , wherein the anode comprises 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 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.

4. The anode according to claim 3 , 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.

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

6. A secondary battery comprising the anode according to claim 1 .

7. The secondary battery according to claim 6 , wherein the secondary battery is a lithium secondary battery.

8. A battery module comprising the secondary battery according to claim 7 as a unit battery.

9. A battery pack comprising the battery module according to claim 8 .

10. A device comprising the battery pack according to claim 9 .

11. The device according to claim 10 , wherein the device is an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a system for storing power.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Min Hee
• Park Tae Jin
• Kim Daehong

Classifications

• H01M4/625 Primary

  Carbon or graphite · CPC title

• H01M4/667

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

• H01M4/13

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

• H01M2220/10

  Batteries in stationary systems, e.g. emergency power source in plant · CPC title

• H01M50/20

  Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders (structural combination of accumulators with charging apparatus H01M10/46) · CPC title