IP Library › Granted Patent US 8,080,337
Granted Patent B2
US 8,080,337 · App. 12/159,151 · Granted Dec 20, 2011

Electrode for lithium secondary battery and lithium secondary battery using same

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Quick Facts
Patent No.
US 8,080,337
App. No.
12/159,151
Granted
Dec 20, 2011
Kind
B2
Abstract

The present invention has an object of providing a lithium secondary battery and an electrode for a lithium secondary battery having a superb cycle characteristic. The present invention relates to an electrode for a lithium secondary battery, and a lithium secondary battery including the electrode, the electrode including a current collector and an active substance structure provided on the current collector, wherein the active substance structure includes at least one first layer containing a first material for occluding and releasing lithium ions and at least one second layer containing a conductive second material which does not chemically react with lithium; the first layer and the second layer are alternately laminated; and the second layer has a Young's modulus larger than the Young's modulus of the first layer.

Claims (17)

1. An electrode for a lithium secondary battery, comprising a current collector and an active substance structure provided on the current collector, wherein:

the active substance structure includes at least one first layer containing a first material for occluding and releasing lithium ions and at least one second layer containing a conductive second material which does not chemically react with lithium;

the at least one first layer and the at least one second layer are alternately laminated;

the at least one second layer has a Young's modulus larger than the Young's modulus of the at least one first layer;

the second material is a conductive metal compound,

the second material has a Young's modulus of 200 GPa or greater, and

the second material is one material selected from metal nitrides, metal carbides and metal borides.

2. The electrode for a lithium secondary battery of claim 1 , wherein the second material is a nitride of a group 4A metal material.

3. The electrode for a lithium secondary battery of claim 2 , wherein the second material is one, or a mixture of two, selected from titanium nitride, zirconium nitride and hafnium nitride.

4. The electrode for a lithium secondary battery of claim 3 , wherein at least two first layers and at least two second layers are included.

5. The electrode for a lithium secondary battery of claim 4 , wherein each of the at least two second layers have a thickness of smaller than 6 nm.

6. The electrode for a lithium secondary battery of claim 5 , wherein each of the at least two first layers have a thickness of equal to or smaller than 4.5 nm.

7. The electrode for a lithium secondary battery of claim 6 , wherein each of the at least two second layers have a plurality of openings.

8. The electrode for a lithium secondary battery of claim 7 , wherein the electrode is a negative electrode.

9. The electrode for a lithium secondary battery of claim 8 , wherein the first material contains at least one selected from silicon, germanium and tin.

10. The electrode for a lithium secondary battery of claim 7 , wherein the electrode is a positive electrode.

11. The electrode for a lithium secondary battery of claim 10 , wherein the first material contains a composite oxide or a composite sulfide of a transition metal material containing lithium.